46 Commits

Author	SHA1	Message	Date
Raghavendra Rao Ananta	5bd75403be	Merge remote-tracking branch 'remotes/origin/tmp-f686d9f' into msm-lahaina ... * remotes/origin/tmp-f686d9f: ANDROID: update abi_gki_aarch64.xml for 5.2-rc6 Linux 5.2-rc6 Revert "iommu/vt-d: Fix lock inversion between iommu->lock and device_domain_lock" Bluetooth: Fix regression with minimum encryption key size alignment tcp: refine memory limit test in tcp_fragment() x86/vdso: Prevent segfaults due to hoisted vclock reads SUNRPC: Fix a credential refcount leak Revert "SUNRPC: Declare RPC timers as TIMER_DEFERRABLE" net :sunrpc :clnt :Fix xps refcount imbalance on the error path NFS4: Only set creation opendata if O_CREAT ANDROID: gki_defconfig: workaround to enable configs ANDROID: gki_defconfig: more configs for partners ARM: 8867/1: vdso: pass --be8 to linker if necessary KVM: nVMX: reorganize initial steps of vmx_set_nested_state KVM: PPC: Book3S HV: Invalidate ERAT when flushing guest TLB entries habanalabs: use u64_to_user_ptr() for reading user pointers nfsd: replace Jeff by Chuck as nfsd co-maintainer inet: clear num_timeout reqsk_alloc() PCI/P2PDMA: Ignore root complex whitelist when an IOMMU is present net: mvpp2: debugfs: Add pmap to fs dump ipv6: Default fib6_type to RTN_UNICAST when not set net: hns3: Fix inconsistent indenting net/af_iucv: always register net_device notifier net/af_iucv: build proper skbs for HiperTransport net/af_iucv: remove GFP_DMA restriction for HiperTransport doc: fix documentation about UIO_MEM_LOGICAL using MAINTAINERS / Documentation: Thorsten Scherer is the successor of Gavin Schenk docs: fb: Add TER16x32 to the available font names MAINTAINERS: fpga: hand off maintainership to Moritz treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 507 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 506 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 505 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 504 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 503 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 502 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 501 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 499 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 498 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 497 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 496 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 495 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 491 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 490 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 489 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 488 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 487 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 486 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 485 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 484 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 482 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 481 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 480 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 479 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 477 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 475 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 474 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 473 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 472 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 471 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 469 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 468 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 467 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 466 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 465 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 464 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 463 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 462 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 461 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 460 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 459 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 457 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 456 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 455 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 454 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 452 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 451 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 250 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 248 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 247 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 246 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 245 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 244 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 243 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 239 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 238 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 237 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 235 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 233 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 232 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 231 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 230 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 226 KVM: arm/arm64: Fix emulated ptimer irq injection net: dsa: mv88e6xxx: fix shift of FID bits in mv88e6185_g1_vtu_loadpurge() tests: kvm: Check for a kernel warning kvm: tests: Sort tests in the Makefile alphabetically KVM: x86/mmu: Allocate PAE root array when using SVM's 32-bit NPT KVM: x86: Modify struct kvm_nested_state to have explicit fields for data fanotify: update connector fsid cache on add mark quota: fix a problem about transfer quota drm/i915: Don't clobber M/N values during fastset check powerpc: enable a 30-bit ZONE_DMA for 32-bit pmac ovl: make i_ino consistent with st_ino in more cases scsi: qla2xxx: Fix hardlockup in abort command during driver remove scsi: ufs: Avoid runtime suspend possibly being blocked forever scsi: qedi: update driver version to 8.37.0.20 scsi: qedi: Check targetname while finding boot target information hvsock: fix epollout hang from race condition net/udp_gso: Allow TX timestamp with UDP GSO net: netem: fix use after free and double free with packet corruption net: netem: fix backlog accounting for corrupted GSO frames net: lio_core: fix potential sign-extension overflow on large shift tipc: pass tunnel dev as NULL to udp_tunnel(6)_xmit_skb ip6_tunnel: allow not to count pkts on tstats by passing dev as NULL ip_tunnel: allow not to count pkts on tstats by setting skb's dev to NULL apparmor: reset pos on failure to unpack for various functions apparmor: enforce nullbyte at end of tag string apparmor: fix PROFILE_MEDIATES for untrusted input RDMA/efa: Handle mmap insertions overflow tun: wake up waitqueues after IFF_UP is set drm: return -EFAULT if copy_to_user() fails net: remove duplicate fetch in sock_getsockopt tipc: fix issues with early FAILOVER_MSG from peer bnx2x: Check if transceiver implements DDM before access xhci: detect USB 3.2 capable host controllers correctly usb: xhci: Don't try to recover an endpoint if port is in error state. KVM: fix typo in documentation drm/panfrost: Make sure a BO is only unmapped when appropriate md: fix for divide error in status_resync soc: ixp4xx: npe: Fix an IS_ERR() vs NULL check in probe arm64/mm: don't initialize pgd_cache twice MAINTAINERS: Update my email address arm64/sve: <uapi/asm/ptrace.h> should not depend on <uapi/linux/prctl.h> ovl: fix typo in MODULE_PARM_DESC ovl: fix bogus -Wmaybe-unitialized warning ovl: don't fail with disconnected lower NFS mmc: core: Prevent processing SDIO IRQs when the card is suspended mmc: sdhci: sdhci-pci-o2micro: Correctly set bus width when tuning brcmfmac: sdio: Don't tune while the card is off mmc: core: Add sdio_retune_hold_now() and sdio_retune_release() brcmfmac: sdio: Disable auto-tuning around commands expected to fail mmc: core: API to temporarily disable retuning for SDIO CRC errors Revert "brcmfmac: disable command decode in sdio_aos" ARM: ixp4xx: include irqs.h where needed ARM: ixp4xx: mark ixp4xx_irq_setup as __init ARM: ixp4xx: don't select SERIAL_OF_PLATFORM firmware: trusted_foundations: add ARMv7 dependency usb: dwc2: Use generic PHY width in params setup RDMA/efa: Fix success return value in case of error IB/hfi1: Handle port down properly in pio IB/hfi1: Handle wakeup of orphaned QPs for pio IB/hfi1: Wakeup QPs orphaned on wait list after flush IB/hfi1: Use aborts to trigger RC throttling IB/hfi1: Create inline to get extended headers IB/hfi1: Silence txreq allocation warnings IB/hfi1: Avoid hardlockup with flushlist_lock KVM: PPC: Book3S HV: Only write DAWR[X] when handling h_set_dawr in real mode KVM: PPC: Book3S HV: Fix r3 corruption in h_set_dabr() fs/namespace: fix unprivileged mount propagation vfs: fsmount: add missing mntget() cifs: fix GlobalMid_Lock bug in cifs_reconnect SMB3: retry on STATUS_INSUFFICIENT_RESOURCES instead of failing write staging: erofs: add requirements field in superblock arm64: ssbd: explicitly depend on <linux/prctl.h> block: fix page leak when merging to same page block: return from __bio_try_merge_page if merging occured in the same page Btrfs: fix failure to persist compression property xattr deletion on fsync riscv: remove unused barrier defines usb: chipidea: udc: workaround for endpoint conflict issue MAINTAINERS: Change QCOM repo location mmc: mediatek: fix SDIO IRQ detection issue mmc: mediatek: fix SDIO IRQ interrupt handle flow mmc: core: complete HS400 before checking status riscv: mm: synchronize MMU after pte change MAINTAINERS: Update my email address to use @kernel.org ANDROID: update abi_gki_aarch64.xml for 5.2-rc5 riscv: dts: add initial board data for the SiFive HiFive Unleashed riscv: dts: add initial support for the SiFive FU540-C000 SoC dt-bindings: riscv: convert cpu binding to json-schema dt-bindings: riscv: sifive: add YAML documentation for the SiFive FU540 arch: riscv: add support for building DTB files from DT source data drm/i915/gvt: ignore unexpected pvinfo write lapb: fixed leak of control-blocks. tipc: purge deferredq list for each grp member in tipc_group_delete ax25: fix inconsistent lock state in ax25_destroy_timer neigh: fix use-after-free read in pneigh_get_next tcp: fix compile error if !CONFIG_SYSCTL hv_sock: Suppress bogus "may be used uninitialized" warnings be2net: Fix number of Rx queues used for flow hashing net: handle 802.1P vlan 0 packets properly Linux 5.2-rc5 tcp: enforce tcp_min_snd_mss in tcp_mtu_probing() tcp: add tcp_min_snd_mss sysctl tcp: tcp_fragment() should apply sane memory limits tcp: limit payload size of sacked skbs Revert "net: phylink: set the autoneg state in phylink_phy_change" bpf: fix nested bpf tracepoints with per-cpu data bpf: Fix out of bounds memory access in bpf_sk_storage vsock/virtio: set SOCK_DONE on peer shutdown net: dsa: rtl8366: Fix up VLAN filtering net: phylink: set the autoneg state in phylink_phy_change powerpc/32: fix build failure on book3e with KVM powerpc/booke: fix fast syscall entry on SMP powerpc/32s: fix initial setup of segment registers on secondary CPU x86/microcode, cpuhotplug: Add a microcode loader CPU hotplug callback net: add high_order_alloc_disable sysctl/static key tcp: add tcp_tx_skb_cache sysctl tcp: add tcp_rx_skb_cache sysctl sysctl: define proc_do_static_key() hv_netvsc: Set probe mode to sync net: sched: flower: don't call synchronize_rcu() on mask creation net: dsa: fix warning same module names sctp: Free cookie before we memdup a new one net: dsa: microchip: Don't try to read stats for unused ports qmi_wwan: extend permitted QMAP mux_id value range qmi_wwan: avoid RCU stalls on device disconnect when in QMAP mode qmi_wwan: add network device usage statistics for qmimux devices qmi_wwan: add support for QMAP padding in the RX path bpf, x64: fix stack layout of JITed bpf code Smack: Restore the smackfsdef mount option and add missing prefixes bpf, devmap: Add missing RCU read lock on flush bpf, devmap: Add missing bulk queue free bpf, devmap: Fix premature entry free on destroying map ftrace: Fix NULL pointer dereference in free_ftrace_func_mapper() module: Fix livepatch/ftrace module text permissions race tracing/uprobe: Fix obsolete comment on trace_uprobe_create() tracing/uprobe: Fix NULL pointer dereference in trace_uprobe_create() tracing: Make two symbols static tracing: avoid build warning with HAVE_NOP_MCOUNT tracing: Fix out-of-range read in trace_stack_print() gfs2: Fix rounding error in gfs2_iomap_page_prepare net: phylink: further mac_config documentation improvements nfc: Ensure presence of required attributes in the deactivate_target handler btrfs: start readahead also in seed devices x86/kasan: Fix boot with 5-level paging and KASAN cfg80211: report measurement start TSF correctly cfg80211: fix memory leak of wiphy device name cfg80211: util: fix bit count off by one mac80211: do not start any work during reconfigure flow cfg80211: use BIT_ULL in cfg80211_parse_mbssid_data() mac80211: only warn once on chanctx_conf being NULL mac80211: drop robust management frames from unknown TA gpu: ipu-v3: image-convert: Fix image downsize coefficients gpu: ipu-v3: image-convert: Fix input bytesperline for packed formats gpu: ipu-v3: image-convert: Fix input bytesperline width/height align thunderbolt: Implement CIO reset correctly for Titan Ridge ARM: davinci: da8xx: specify dma_coherent_mask for lcdc ARM: davinci: da850-evm: call regulator_has_full_constraints() timekeeping: Repair ktime_get_coarse*() granularity Revert "ALSA: hda/realtek - Improve the headset mic for Acer Aspire laptops" ANDROID: update abi_gki_aarch64.xml mm/devm_memremap_pages: fix final page put race PCI/P2PDMA: track pgmap references per resource, not globally lib/genalloc: introduce chunk owners PCI/P2PDMA: fix the gen_pool_add_virt() failure path mm/devm_memremap_pages: introduce devm_memunmap_pages drivers/base/devres: introduce devm_release_action() mm/vmscan.c: fix trying to reclaim unevictable LRU page coredump: fix race condition between collapse_huge_page() and core dumping mm/mlock.c: change count_mm_mlocked_page_nr return type mm: mmu_gather: remove __tlb_reset_range() for force flush fs/ocfs2: fix race in ocfs2_dentry_attach_lock() mm/vmscan.c: fix recent_rotated history mm/mlock.c: mlockall error for flag MCL_ONFAULT scripts/decode_stacktrace.sh: prefix addr2line with $CROSS_COMPILE mm/list_lru.c: fix memory leak in __memcg_init_list_lru_node mm: memcontrol: don't batch updates of local VM stats and events PCI: PM: Skip devices in D0 for suspend-to-idle ANDROID: Removed extraneous configs from gki powerpc/bpf: use unsigned division instruction for 64-bit operations bpf: fix div64 overflow tests to properly detect errors bpf: sync BPF_FIB_LOOKUP flag changes with BPF uapi bpf: simplify definition of BPF_FIB_LOOKUP related flags cifs: add spinlock for the openFileList to cifsInodeInfo cifs: fix panic in smb2_reconnect x86/fpu: Don't use current->mm to check for a kthread KVM: nVMX: use correct clean fields when copying from eVMCS vfio-ccw: Destroy kmem cache region on module exit block/ps3vram: Use %llu to format sector_t after LBDAF removal libata: Extend quirks for the ST1000LM024 drives with NOLPM quirk bcache: only set BCACHE_DEV_WB_RUNNING when cached device attached bcache: fix stack corruption by PRECEDING_KEY() arm64/sve: Fix missing SVE/FPSIMD endianness conversions blk-mq: remove WARN_ON(!q->elevator) from blk_mq_sched_free_requests blkio-controller.txt: Remove references to CFQ block/switching-sched.txt: Update to blk-mq schedulers null_blk: remove duplicate check for report zone blk-mq: no need to check return value of debugfs_create functions io_uring: fix memory leak of UNIX domain socket inode block: force select mq-deadline for zoned block devices binder: fix possible UAF when freeing buffer drm/amdgpu: return 0 by default in amdgpu_pm_load_smu_firmware drm/amdgpu: Fix bounds checking in amdgpu_ras_is_supported() ANDROID: x86 gki_defconfig: enable DMA_CMA ANDROID: Fixed x86 regression ANDROID: gki_defconfig: enable DMA_CMA Input: synaptics - enable SMBus on ThinkPad E480 and E580 net: mvpp2: prs: Use the correct helpers when removing all VID filters net: mvpp2: prs: Fix parser range for VID filtering mlxsw: spectrum: Disallow prio-tagged packets when PVID is removed mlxsw: spectrum_buffers: Reduce pool size on Spectrum-2 selftests: tc_flower: Add TOS matching test mlxsw: spectrum_flower: Fix TOS matching selftests: mlxsw: Test nexthop offload indication mlxsw: spectrum_router: Refresh nexthop neighbour when it becomes dead mlxsw: spectrum: Use different seeds for ECMP and LAG hash net: tls, correctly account for copied bytes with multiple sk_msgs vrf: Increment Icmp6InMsgs on the original netdev cpuset: restore sanity to cpuset_cpus_allowed_fallback() net: ethtool: Allow matching on vlan DEI bit linux-next: DOC: RDS: Fix a typo in rds.txt x86/kgdb: Return 0 from kgdb_arch_set_breakpoint() mpls: fix af_mpls dependencies for real selinux: fix a missing-check bug in selinux_sb_eat_lsm_opts() selinux: fix a missing-check bug in selinux_add_mnt_opt( ) arm64: tlbflush: Ensure start/end of address range are aligned to stride usb: typec: Make sure an alt mode exist before getting its partner KVM: arm/arm64: vgic: Fix kvm_device leak in vgic_its_destroy KVM: arm64: Filter out invalid core register IDs in KVM_GET_REG_LIST KVM: arm64: Implement vq_present() as a macro xdp: check device pointer before clearing bpf: net: Set sk_bpf_storage back to NULL for cloned sk Btrfs: fix race between block group removal and block group allocation clocksource/drivers/arm_arch_timer: Don't trace count reader functions i2c: pca-platform: Fix GPIO lookup code thunderbolt: Make sure device runtime resume completes before taking domain lock drm: add fallback override/firmware EDID modes workaround i2c: acorn: fix i2c warning arm64: Don't unconditionally add -Wno-psabi to KBUILD_CFLAGS drm/edid: abstract override/firmware EDID retrieval platform/mellanox: mlxreg-hotplug: Add devm_free_irq call to remove flow platform/x86: mlx-platform: Fix parent device in i2c-mux-reg device registration platform/x86: intel-vbtn: Report switch events when event wakes device platform/x86: asus-wmi: Only Tell EC the OS will handle display hotkeys from asus_nb_wmi ARM: mvebu_v7_defconfig: fix Ethernet on Clearfog x86/resctrl: Prevent NULL pointer dereference when local MBM is disabled x86/resctrl: Don't stop walking closids when a locksetup group is found iommu/arm-smmu: Avoid constant zero in TLBI writes drm/i915/perf: fix whitelist on Gen10+ drm/i915/sdvo: Implement proper HDMI audio support for SDVO drm/i915: Fix per-pixel alpha with CCS drm/i915/dmc: protect against reading random memory drm/i915/dsi: Use a fuzzy check for burst mode clock check Input: imx_keypad - make sure keyboard can always wake up system selinux: log raw contexts as untrusted strings ptrace: restore smp_rmb() in __ptrace_may_access() IB/hfi1: Correct tid qp rcd to match verbs context IB/hfi1: Close PSM sdma_progress sleep window IB/hfi1: Validate fault injection opcode user input geneve: Don't assume linear buffers in error handler vxlan: Don't assume linear buffers in error handler net: openvswitch: do not free vport if register_netdevice() is failed. net: correct udp zerocopy refcnt also when zerocopy only on append drm/amdgpu/{uvd,vcn}: fetch ring's read_ptr after alloc ovl: fix wrong flags check in FS_IOC_FS[SG]ETXATTR ioctls riscv: Fix udelay in RV32. drm/vmwgfx: fix a warning due to missing dma_parms riscv: export pm_power_off again drm/vmwgfx: Honor the sg list segment size limitation RISC-V: defconfig: enable clocks, serial console drm/vmwgfx: Use the backdoor port if the HB port is not available bpf: lpm_trie: check left child of last leftmost node for NULL Revert "fuse: require /dev/fuse reads to have enough buffer capacity" ALSA: ice1712: Check correct return value to snd_i2c_sendbytes (EWS/DMX 6Fire) ALSA: oxfw: allow PCM capture for Stanton SCS.1m ALSA: firewire-motu: fix destruction of data for isochronous resources s390/ctl_reg: mark __ctl_set_bit and __ctl_clear_bit as __always_inline s390/boot: disable address-of-packed-member warning ANDROID: update gki aarch64 ABI representation cgroup: Fix css_task_iter_advance_css_set() cset skip condition drm/panfrost: Require the simple_ondemand governor drm/panfrost: make devfreq optional again drm/gem_shmem: Use a writecombine mapping for ->vaddr mmc: sdhi: disallow HS400 for M3-W ES1.2, RZ/G2M, and V3H ASoC: Intel: sst: fix kmalloc call with wrong flags ASoC: core: Fix deadlock in snd_soc_instantiate_card() cgroup/bfq: revert bfq.weight symlink change ARM: dts: am335x phytec boards: Fix cd-gpios active level ARM: dts: dra72x: Disable usb4_tm target module nfp: ensure skb network header is set for packet redirect tcp: fix undo spurious SYNACK in passive Fast Open mpls: fix af_mpls dependencies ibmvnic: Fix unchecked return codes of memory allocations ibmvnic: Refresh device multicast list after reset ibmvnic: Do not close unopened driver during reset mpls: fix warning with multi-label encap net: phy: rename Asix Electronics PHY driver ipv6: flowlabel: fl6_sock_lookup() must use atomic_inc_not_zero net: ipv4: fib_semantics: fix uninitialized variable Input: iqs5xx - get axis info before calling input_mt_init_slots() Linux 5.2-rc4 drm: panel-orientation-quirks: Add quirk for GPD MicroPC drm: panel-orientation-quirks: Add quirk for GPD pocket2 counter/ftm-quaddec: Add missing dependencies in Kconfig staging: iio: adt7316: Fix build errors when GPIOLIB is not set x86/fpu: Update kernel's FPU state before using for the fsave header MAINTAINERS: Karthikeyan Ramasubramanian is MIA i2c: xiic: Add max_read_len quirk ANDROID: update ABI representation gpio: pca953x: hack to fix 24 bit gpio expanders net/mlx5e: Support tagged tunnel over bond net/mlx5e: Avoid detaching non-existing netdev under switchdev mode net/mlx5e: Fix source port matching in fdb peer flow rule net/mlx5e: Replace reciprocal_scale in TX select queue function net/mlx5e: Add ndo_set_feature for uplink representor net/mlx5: Avoid reloading already removed devices net/mlx5: Update pci error handler entries and command translation RAS/CEC: Convert the timer callback to a workqueue RAS/CEC: Fix binary search function x86/mm/KASLR: Compute the size of the vmemmap section properly can: purge socket error queue on sock destruct can: flexcan: Remove unneeded registration message can: af_can: Fix error path of can_init() can: m_can: implement errata "Needless activation of MRAF irq" can: mcp251x: add support for mcp25625 dt-bindings: can: mcp251x: add mcp25625 support can: xilinx_can: use correct bittiming_const for CAN FD core can: flexcan: fix timeout when set small bitrate can: usb: Kconfig: Remove duplicate menu entry lockref: Limit number of cmpxchg loop retries uaccess: add noop untagged_addr definition x86/insn-eval: Fix use-after-free access to LDT entry kbuild: use more portable 'command -v' for cc-cross-prefix s390/unwind: correct stack switching during unwind scsi: hpsa: correct ioaccel2 chaining btrfs: Always trim all unallocated space in btrfs_trim_free_extents netfilter: ipv6: nf_defrag: accept duplicate fragments again powerpc/32s: fix booting with CONFIG_PPC_EARLY_DEBUG_BOOTX drm/meson: fix G12A primary plane disabling drm/meson: fix primary plane disabling drm/meson: fix G12A HDMI PLL settings for 4K60 1000/1001 variations block, bfq: add weight symlink to the bfq.weight cgroup parameter cgroup: let a symlink too be created with a cftype file powerpc/64s: __find_linux_pte() synchronization vs pmdp_invalidate() powerpc/64s: Fix THP PMD collapse serialisation powerpc: Fix kexec failure on book3s/32 drm/nouveau/secboot/gp10[2467]: support newer FW to fix SEC2 failures on some boards drm/nouveau/secboot: enable loading of versioned LS PMU/SEC2 ACR msgqueue FW drm/nouveau/secboot: split out FW version-specific LS function pointers drm/nouveau/secboot: pass max supported FW version to LS load funcs drm/nouveau/core: support versioned firmware loading drm/nouveau/core: pass subdev into nvkm_firmware_get, rather than device block: free sched's request pool in blk_cleanup_queue bpf: expand section tests for test_section_names bpf: more msg_name rewrite tests to test_sock_addr bpf, bpftool: enable recvmsg attach types bpf, libbpf: enable recvmsg attach types bpf: sync tooling uapi header bpf: fix unconnected udp hooks vfio/mdev: Synchronize device create/remove with parent removal vfio/mdev: Avoid creating sysfs remove file on stale device removal pktgen: do not sleep with the thread lock held. net: mvpp2: Use strscpy to handle stat strings net: rds: fix memory leak in rds_ib_flush_mr_pool ipv6: fix EFAULT on sendto with icmpv6 and hdrincl ipv6: use READ_ONCE() for inet->hdrincl as in ipv4 soundwire: intel: set dai min and max channels correctly soundwire: stream: fix bad unlock balance x86/fpu: Use fault_in_pages_writeable() for pre-faulting nvme-rdma: use dynamic dma mapping per command nvme: Fix u32 overflow in the number of namespace list calculation vfio/mdev: Improve the create/remove sequence SoC: rt274: Fix internal jack assignment in set_jack callback ALSA: hdac: fix memory release for SST and SOF drivers ASoC: SOF: Intel: hda: use the defined ppcap functions ASoC: core: move DAI pre-links initiation to snd_soc_instantiate_card ASoC: Intel: cht_bsw_rt5672: fix kernel oops with platform_name override ASoC: Intel: cht_bsw_nau8824: fix kernel oops with platform_name override ASoC: Intel: bytcht_es8316: fix kernel oops with platform_name override ASoC: Intel: cht_bsw_max98090: fix kernel oops with platform_name override Revert "gfs2: Replace gl_revokes with a GLF flag" arm64: Silence gcc warnings about arch ABI drift parisc: Fix crash due alternative coding for NP iopdir_fdc bit parisc: Use lpa instruction to load physical addresses in driver code parisc: configs: Remove useless UEVENT_HELPER_PATH parisc: Use implicit space register selection for loading the coherence index of I/O pdirs usb: gadget: udc: lpc32xx: fix return value check in lpc32xx_udc_probe() usb: gadget: dwc2: fix zlp handling usb: dwc2: Set actual frame number for completed ISOC transfer for none DDMA usb: gadget: udc: lpc32xx: allocate descriptor with GFP_ATOMIC usb: gadget: fusb300_udc: Fix memory leak of fusb300->ep[i] usb: phy: mxs: Disable external charger detect in mxs_phy_hw_init() usb: dwc2: Fix DMA cache alignment issues usb: dwc2: host: Fix wMaxPacketSize handling (fix webcam regression) ARM64: trivial: s/TIF_SECOMP/TIF_SECCOMP/ comment typo fix drm/komeda: Potential error pointer dereference drm/komeda: remove set but not used variable 'kcrtc' x86/CPU: Add more Icelake model numbers hwmon: (pmbus/core) Treat parameters as paged if on multiple pages hwmon: (pmbus/core) mutex_lock write in pmbus_set_samples hwmon: (core) add thermal sensors only if dev->of_node is present Revert "fib_rules: return 0 directly if an exactly same rule exists when NLM_F_EXCL not supplied" net: aquantia: fix wol configuration not applied sometimes ethtool: fix potential userspace buffer overflow Fix memory leak in sctp_process_init net: rds: fix memory leak when unload rds_rdma ipv6: fix the check before getting the cookie in rt6_get_cookie ipv4: not do cache for local delivery if bc_forwarding is enabled selftests: vm: Fix test build failure when built by itself tools: bpftool: Fix JSON output when lookup fails mmc: also set max_segment_size in the device mtip32xx: also set max_segment_size in the device rsxx: don't call dma_set_max_seg_size nvme-pci: don't limit DMA segement size s390/qeth: handle error when updating TX queue count s390/qeth: fix VLAN attribute in bridge_hostnotify udev event s390/qeth: check dst entry before use s390/qeth: handle limited IPv4 broadcast in L3 TX path ceph: fix error handling in ceph_get_caps() ceph: avoid iput_final() while holding mutex or in dispatch thread ceph: single workqueue for inode related works cgroup: css_task_iter_skip()'d iterators must be advanced before accessed drm/amd/amdgpu: add RLC firmware to support raven1 refresh drm/amd/powerplay: add set_power_profile_mode for raven1_refresh drm/amdgpu: fix ring test failure issue during s3 in vce 3.0 (V2) treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 450 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 449 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 448 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 446 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 445 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 444 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 443 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 442 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 441 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 440 treewide: Replace GPLv2 boilerplate/reference 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Handle Clang auto-initialization pattern block: Drop unlikely before IS_ERR(_OR_NULL) xen/swiotlb: don't initialize swiotlb twice on arm64 s390/mm: fix address space detection in exception handling HID: logitech-dj: Fix 064d:c52f receiver support Revert "HID: core: Call request_module before doing device_add" Revert "HID: core: Do not call request_module() in async context" Revert "HID: Increase maximum report size allowed by hid_field_extract()" tests: fix pidfd-test compilation signal: improve comments samples: fix pidfd-metadata compilation arm64: arch_timer: mark functions as __always_inline arm64: smp: Moved cpu_logical_map[] to smp.h arm64: cpufeature: Fix missing ZFR0 in __read_sysreg_by_encoding() selftests/bpf: move test_lirc_mode2_user to TEST_GEN_PROGS_EXTENDED USB: Fix chipmunk-like voice when using Logitech C270 for recording audio. USB: usb-storage: Add new ID to ums-realtek udmabuf: actually unmap the scatterlist net: fix indirect calls helpers for ptype list hooks. net: ipvlan: Fix ipvlan device tso disabled while NETIF_F_IP_CSUM is set scsi: smartpqi: unlock on error in pqi_submit_raid_request_synchronous() scsi: ufs: Check that space was properly alloced in copy_query_response udp: only choose unbound UDP socket for multicast when not in a VRF net/tls: replace the sleeping lock around RX resync with a bit lock Revert "net/tls: avoid NULL-deref on resync during device removal" block: aoe: no need to check return value of debugfs_create functions net: dsa: sja1105: Fix link speed not working at 100 Mbps and below net: phylink: avoid reducing support mask scripts/checkstack.pl: Fix arm64 wrong or unknown architecture kbuild: tar-pkg: enable communication with jobserver kconfig: tests: fix recursive inclusion unit test kbuild: teach kselftest-merge to find nested config files nvmet: fix data_len to 0 for bdev-backed write_zeroes MAINTAINERS: Hand over skd maintainership ASoC: sun4i-i2s: Add offset to RX channel select ASoC: sun4i-i2s: Fix sun8i tx channel offset mask ASoC: max98090: remove 24-bit format support if RJ is 0 ASoC: da7219: Fix build error without CONFIG_I2C ASoC: SOF: Intel: hda: Fix COMPILE_TEST build error drm/arm/hdlcd: Allow a bit of clock tolerance drm/arm/hdlcd: Actually validate CRTC modes drm/arm/mali-dp: Add a loop around the second set CVAL and try 5 times drm/komeda: fixing of DMA mapping sg segment warning netfilter: ipv6: nf_defrag: fix leakage of unqueued fragments habanalabs: Read upper bits of trace buffer from RWPHI arm64: arch_k3: Fix kconfig dependency warning drm: don't block fb changes for async plane updates drm/vc4: fix fb references in async update drm/msm: fix fb references in async update drm/amd: fix fb references in async update drm/rockchip: fix fb references in async update xen-blkfront: switch kcalloc to kvcalloc for large array allocation drm/mediatek: call mtk_dsi_stop() after mtk_drm_crtc_atomic_disable() drm/mediatek: clear num_pipes when unbind driver drm/mediatek: call drm_atomic_helper_shutdown() when unbinding driver drm/mediatek: unbind components in mtk_drm_unbind() drm/mediatek: fix unbind functions net: sfp: read eeprom in maximum 16 byte increments selftests: set sysctl bc_forwarding properly in router_broadcast.sh ANDROID: update gki aarch64 ABI representation net: ethernet: mediatek: Use NET_IP_ALIGN to judge if HW RX_2BYTE_OFFSET is enabled net: ethernet: mediatek: Use hw_feature to judge if HWLRO is supported net: ethernet: ti: cpsw_ethtool: fix ethtool ring param set ANDROID: gki_defconfig: Enable CMA, SLAB_FREELIST (RANDOM and HARDENED) on x86 bpf: udp: Avoid calling reuseport's bpf_prog from udp_gro bpf: udp: ipv6: Avoid running reuseport's bpf_prog from __udp6_lib_err rcu: locking and unlocking need to always be at least barriers ANDROID: gki_defconfig: enable SLAB_FREELIST_RANDOM, SLAB_FREELIST_HARDENED ANDROID: gki_defconfig: enable CMA and increase CMA_AREAS ASoC: SOF: fix DSP oops definitions in FW ABI ASoC: hda: fix unbalanced codec dev refcount for HDA_DEV_ASOC ASoC: SOF: ipc: replace fw ready bitfield with explicit bit ordering ASoC: SOF: bump to ABI 3.6 ASoC: SOF: soundwire: add initial soundwire support ASoC: SOF: uapi: mirror firmware changes ASoC: Intel: Baytrail: add quirk for Aegex 10 (RU2) tablet xfs: inode btree scrubber should calculate im_boffset correctly mmc: sdhci_am654: Fix SLOTTYPE write usb: typec: ucsi: ccg: fix memory leak in do_flash ANDROID: update gki aarch64 ABI representation habanalabs: Fix virtual address access via debugfs for 2MB pages drm/komeda: Constify the usage of komeda_component/pipeline/dev_funcs x86/power: Fix 'nosmt' vs hibernation triple fault during resume mm/vmalloc: Avoid rare case of flushing TLB with weird arguments mm/vmalloc: Fix calculation of direct map addr range PM: sleep: Add kerneldoc comments to some functions drm/i915/gvt: save RING_HEAD into vreg when vgpu switched out sparc: perf: fix updated event period in response to PERF_EVENT_IOC_PERIOD mdesc: fix a missing-check bug in get_vdev_port_node_info() drm/i915/gvt: add F_CMD_ACCESS flag for wa regs sparc64: Fix regression in non-hypervisor TLB flush xcall packet: unconditionally free po->rollover Update my email address net: hns: Fix loopback test failed at copper ports Linux 5.2-rc3 net: dsa: mv88e6xxx: avoid error message on remove from VLAN 0 mm, compaction: make sure we isolate a valid PFN include/linux/generic-radix-tree.h: fix kerneldoc comment kernel/signal.c: trace_signal_deliver when signal_group_exit drivers/iommu/intel-iommu.c: fix variable 'iommu' set but not used spdxcheck.py: fix directory structures kasan: initialize tag to 0xff in __kasan_kmalloc z3fold: fix sheduling while atomic scripts/gdb: fix invocation when CONFIG_COMMON_CLK is not set mm/gup: continue VM_FAULT_RETRY processing even for pre-faults ocfs2: fix error path kobject memory leak memcg: make it work on sparse non-0-node systems mm, memcg: consider subtrees in memory.events prctl_set_mm: downgrade mmap_sem to read lock prctl_set_mm: refactor checks from validate_prctl_map kernel/fork.c: make max_threads symbol static arch/arm/boot/compressed/decompress.c: fix build error due to lz4 changes arch/parisc/configs/c8000_defconfig: remove obsoleted CONFIG_DEBUG_SLAB_LEAK mm/vmalloc.c: fix typo in comment lib/sort.c: fix kernel-doc notation warnings mm: fix Documentation/vm/hmm.rst Sphinx warnings treewide: fix typos of SPDX-License-Identifier crypto: ux500 - fix license comment syntax error MAINTAINERS: add I2C DT bindings to ARM platforms MAINTAINERS: add DT bindings to i2c drivers mwifiex: Fix heap overflow in mwifiex_uap_parse_tail_ies() iwlwifi: mvm: change TLC config cmd sent by rs to be async iwlwifi: Fix double-free problems in iwl_req_fw_callback() iwlwifi: fix AX201 killer sku loading firmware issue iwlwifi: print fseq info upon fw assert iwlwifi: clear persistence bit according to device family iwlwifi: fix load in rfkill flow for unified firmware iwlwifi: mvm: remove d3_sram debugfs file bpf, riscv: clear high 32 bits for ALU32 add/sub/neg/lsh/rsh/arsh libbpf: Return btf_fd for load_sk_storage_btf HID: a4tech: fix horizontal scrolling HID: hyperv: Add a module description line net: dsa: sja1105: Don't store frame type in skb->cb block: print offending values when cloned rq limits are exceeded blk-mq: Document the blk_mq_hw_queue_to_node() arguments blk-mq: Fix spelling in a source code comment block: Fix bsg_setup_queue() kernel-doc header block: Fix rq_qos_wait() kernel-doc header block: Fix blk_mq_*_map_queues() kernel-doc headers block: Fix throtl_pending_timer_fn() kernel-doc header block: Convert blk_invalidate_devt() header into a non-kernel-doc header block/partitions/ldm: Convert a kernel-doc header into a non-kernel-doc header leds: avoid flush_work in atomic context cgroup: Include dying leaders with live threads in PROCS iterations cgroup: Implement css_task_iter_skip() cgroup: Call cgroup_release() before __exit_signal() netfilter: nf_tables: fix module autoload with inet family Revert "lockd: Show pid of lockd for remote locks" ALSA: hda/realtek - Update headset mode for ALC256 fs/adfs: fix filename fixup handling for "/" and "//" names fs/adfs: move append_filetype_suffix() into adfs_object_fixup() fs/adfs: remove truncated filename hashing fs/adfs: factor out filename fixup fs/adfs: factor out object fixups fs/adfs: factor out filename case lowering fs/adfs: factor out filename comparison ovl: doc: add non-standard corner cases pstore/ram: Run without kernel crash dump region MAINTAINERS: add Vasily Gorbik and Christian Borntraeger for s390 MAINTAINERS: Farewell Martin Schwidefsky pstore: Set tfm to NULL on free_buf_for_compression nds32: add new emulations for floating point instruction nds32: Avoid IEX status being incorrectly modified math-emu: Use statement expressions to fix Wshift-count-overflow warning net: correct zerocopy refcnt with udp MSG_MORE ethtool: Check for vlan etype or vlan tci when parsing flow_rule net: don't clear sock->sk early to avoid trouble in strparser net-gro: fix use-after-free read in napi_gro_frags() net: dsa: tag_8021q: Create a stable binary format net: dsa: tag_8021q: Change order of rx_vid setup net: mvpp2: fix bad MVPP2_TXQ_SCHED_TOKEN_CNTR_REG queue value docs cgroups: add another example size for hugetlb NFSv4.1: Fix bug only first CB_NOTIFY_LOCK is handled NFSv4.1: Again fix a race where CB_NOTIFY_LOCK fails to wake a waiter ipv4: tcp_input: fix stack out of bounds when parsing TCP options. mlxsw: spectrum: Prevent force of 56G mlxsw: spectrum_acl: Avoid warning after identical rules insertion SUNRPC: Fix a use after free when a server rejects the RPCSEC_GSS credential net: dsa: mv88e6xxx: fix handling of upper half of STATS_TYPE_PORT SUNRPC fix regression in umount of a secure mount r8169: fix MAC address being lost in PCI D3 treewide: Add SPDX license identifier - Kbuild treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 225 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 224 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 223 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 222 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 221 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 220 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 218 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 217 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 216 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 215 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 214 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 213 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 211 treewide: Replace GPLv2 boilerplate/reference with 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Replace GPLv2 boilerplate/reference with SPDX - rule 133 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 132 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 131 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 130 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 129 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 128 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 127 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 126 net: core: support XDP generic on stacked devices. netvsc: unshare skb in VF rx handler udp: Avoid post-GRO UDP checksum recalculation nvme-tcp: fix queue mapping when queue count is limited nvme-rdma: fix queue mapping when queue count is limited fpga: zynqmp-fpga: Correctly handle error pointer selftests: vm: install test_vmalloc.sh for run_vmtests userfaultfd: selftest: fix compiler warning kselftest/cgroup: fix incorrect test_core skip kselftest/cgroup: fix unexpected testing failure on test_core kselftest/cgroup: fix unexpected testing failure on test_memcontrol xtensa: Fix section mismatch between memblock_reserve and mem_reserve signal/ptrace: Don't leak unitialized kernel memory with PTRACE_PEEK_SIGINFO mwifiex: Abort at too short BSS descriptor element mwifiex: Fix possible buffer overflows at parsing bss descriptor drm/i915/gvt: Assign NULL to the pointer after memory free. drm/i915/gvt: Check if cur_pt_type is valid x86: intel_epb: Do not build when CONFIG_PM is unset crypto: hmac - fix memory leak in hmac_init_tfm() crypto: jitterentropy - change back to module_init() ARM: dts: Drop bogus CLKSEL for timer12 on dra7 KVM: PPC: Book3S HV: Restore SPRG3 in kvmhv_p9_guest_entry() KVM: PPC: Book3S HV: Fix lockdep warning when entering guest on POWER9 KVM: PPC: Book3S HV: XIVE: Fix page offset when clearing ESB pages KVM: PPC: Book3S HV: XIVE: Take the srcu read lock when accessing memslots KVM: PPC: Book3S HV: XIVE: Do not clear IRQ data of passthrough interrupts KVM: PPC: Book3S HV: XIVE: Introduce a new mutex for the XIVE device drm/i915/gvt: Fix cmd length of VEB_DI_IECP drm/i915/gvt: refine ggtt range validation drm/i915/gvt: Fix vGPU CSFE_CHICKEN1_REG mmio handler drm/i915/gvt: Fix GFX_MODE handling drm/i915/gvt: Update force-to-nonpriv register whitelist drm/i915/gvt: Initialize intel_gvt_gtt_entry in stack ima: show rules with IMA_INMASK correctly evm: check hash algorithm passed to init_desc() scsi: libsas: delete sas port if expander discover failed scsi: libsas: only clear phy->in_shutdown after shutdown event done scsi: scsi_dh_alua: Fix possible null-ptr-deref scsi: smartpqi: properly set both the DMA mask and the coherent DMA mask scsi: zfcp: fix to prevent port_remove with pure auto scan LUNs (only sdevs) scsi: zfcp: fix missing zfcp_port reference put on -EBUSY from port_remove scsi: libcxgbi: add a check for NULL pointer in cxgbi_check_route() net: phy: dp83867: Set up RGMII TX delay net: phy: dp83867: do not call config_init twice net: phy: dp83867: increase SGMII autoneg timer duration net: phy: dp83867: fix speed 10 in sgmii mode net: phy: marvell10g: report if the PHY fails to boot firmware net: phylink: ensure consistent phy interface mode cgroup: Use css_tryget() instead of css_tryget_online() in task_get_css() blk-mq: Fix memory leak in error handling usbip: usbip_host: fix stub_dev lock context imbalance regression net: sh_eth: fix mdio access in sh_eth_close() for R-Car Gen2 and RZ/A1 SoCs MIPS: uprobes: remove set but not used variable 'epc' s390/crypto: fix possible sleep during spinlock aquired MIPS: pistachio: Build uImage.gz by default MIPS: Make virt_addr_valid() return bool MIPS: Bounds check virt_addr_valid CIFS: cifs_read_allocate_pages: don't iterate through whole page array on ENOMEM RDMA/efa: Remove MAYEXEC flag check from mmap flow mlx5: avoid 64-bit division IB/hfi1: Validate page aligned for a given virtual address IB/{qib, hfi1, rdmavt}: Correct ibv_devinfo max_mr value IB/hfi1: Insure freeze_work work_struct is canceled on shutdown IB/rdmavt: Fix alloc_qpn() WARN_ON() ASoC: sun4i-codec: fix first delay on Speaker drm/amdgpu: reserve stollen vram for raven series media: venus: hfi_parser: fix a regression in parser selftests: bpf: fix compiler warning in flow_dissector test arm64: use the correct function type for __arm64_sys_ni_syscall arm64: use the correct function type in SYSCALL_DEFINE0 arm64: fix syscall_fn_t type block: don't protect generic_make_request_checks with blk_queue_enter block: move blk_exit_queue into __blk_release_queue selftests: bpf: complete sub-register zero extension checks selftests: bpf: move sub-register zero extension checks into subreg.c ovl: detect overlapping layers drm/i915/icl: Add WaDisableBankHangMode ALSA: fireface: Use ULL suffixes for 64-bit constants signal/arm64: Use force_sig not force_sig_fault for SIGKILL nl80211: fill all policy .type entries mac80211: free peer keys before vif down in mesh ANDROID: ABI out: Use the extension .xml rather then .out drm/mediatek: respect page offset for PRIME mmap calls drm/mediatek: adjust ddp clock control flow ALSA: hda/realtek - Improve the headset mic for Acer Aspire laptops KVM: PPC: Book3S HV: XIVE: Fix the enforced limit on the vCPU identifier KVM: PPC: Book3S HV: XIVE: Do not test the EQ flag validity when resetting KVM: PPC: Book3S HV: XIVE: Clear file mapping when device is released KVM: PPC: Book3S HV: Don't take kvm->lock around kvm_for_each_vcpu KVM: PPC: Book3S: Use new mutex to synchronize access to rtas token list KVM: PPC: Book3S HV: Use new mutex to synchronize MMU setup KVM: PPC: Book3S HV: Avoid touching arch.mmu_ready in XIVE release functions Revert "drivers: thermal: tsens: Add new operation to check if a sensor is enabled" net/mlx5e: Disable rxhash when CQE compress is enabled net/mlx5e: restrict the real_dev of vlan device is the same as uplink device net/mlx5: Allocate root ns memory using kzalloc to match kfree net/mlx5: Avoid double free in fs init error unwinding path net/mlx5: Avoid double free of root ns in the error flow path net/mlx5: Fix error handling in mlx5_load() Documentation: net-sysfs: Remove duplicate PHY device documentation llc: fix skb leak in llc_build_and_send_ui_pkt() selftests: pmtu: Fix encapsulating device in pmtu_vti6_link_change_mtu dfs_cache: fix a wrong use of kfree in flush_cache_ent() fs/cifs/smb2pdu.c: fix buffer free in SMB2_ioctl_free cifs: fix memory leak of pneg_inbuf on -EOPNOTSUPP ioctl case xenbus: Avoid deadlock during suspend due to open transactions xen/pvcalls: Remove set but not used variable tracing: Avoid memory leak in predicate_parse() habanalabs: fix bug in checking huge page optimization mmc: sdhci: Fix SDIO IRQ thread deadlock dpaa_eth: use only online CPU portals net: mvneta: Fix err code path of probe net: stmmac: Do not output error on deferred probe Btrfs: fix race updating log root item during fsync Btrfs: fix wrong ctime and mtime of a directory after log replay ARC: [plat-hsdk] Get rid of inappropriate PHY settings ARC: [plat-hsdk]: Add support of Vivante GPU ARC: [plat-hsdk]: enable creg-gpio controller Btrfs: fix fsync not persisting changed attributes of a directory btrfs: qgroup: Check bg while resuming relocation to avoid NULL pointer dereference btrfs: reloc: Also queue orphan reloc tree for cleanup to avoid BUG_ON() Btrfs: incremental send, fix emission of invalid clone operations Btrfs: incremental send, fix file corruption when no-holes feature is enabled btrfs: correct zstd workspace manager lock to use spin_lock_bh() btrfs: Ensure replaced device doesn't have pending chunk allocation ia64: fix build errors by exporting paddr_to_nid() ASoC: SOF: Intel: hda: fix the hda init chip ASoC: SOF: ipc: fix a race, leading to IPC timeouts ASoC: SOF: control: correct the copy size for bytes kcontrol put ASoC: SOF: pcm: remove warning - initialize workqueue on open ASoC: SOF: pcm: clear hw_params_upon_resume flag correctly ASoC: SOF: core: fix error handling with the probe workqueue ASoC: SOF: core: remove snd_soc_unregister_component in case of error ASoC: SOF: core: remove DSP after unregistering machine driver ASoC: soc-core: fixup references at soc_cleanup_card_resources() arm64/module: revert to unsigned interpretation of ABS16/32 relocations KVM: s390: Do not report unusabled IDs via KVM_CAP_MAX_VCPU_ID kvm: fix compile on s390 part 2 xprtrdma: Use struct_size() in kzalloc() tools headers UAPI: Sync kvm.h headers with the kernel sources perf record: Fix s390 missing module symbol and warning for non-root users perf machine: Read also the end of the kernel perf test vmlinux-kallsyms: Ignore aliases to _etext when searching on kallsyms perf session: Add missing swap ops for namespace events perf namespace: Protect reading thread's namespace tools headers UAPI: Sync drm/drm.h with the kernel s390/crypto: fix gcm-aes-s390 selftest failures s390/zcrypt: Fix wrong dispatching for control domain CPRBs s390/pci: fix assignment of bus resources s390/pci: fix struct definition for set PCI function s390: mark __cpacf_check_opcode() and cpacf_query_func() as __always_inline s390: add unreachable() to dump_fault_info() to fix -Wmaybe-uninitialized tools headers UAPI: Sync drm/i915_drm.h with the kernel tools headers UAPI: Sync linux/fs.h with the kernel tools headers UAPI: Sync linux/sched.h with the kernel tools arch x86: Sync asm/cpufeatures.h with the with the kernel tools include UAPI: Update copy of files related to new fspick, fsmount, fsconfig, fsopen, move_mount and open_tree syscalls perf arm64: Fix mksyscalltbl when system kernel headers are ahead of the kernel perf data: Fix 'strncat may truncate' build failure with recent gcc arm64: Fix the arm64_personality() syscall wrapper redirection rtw88: Make some symbols static rtw88: avoid circular locking between local->iflist_mtx and rtwdev->mutex rsi: Properly initialize data in rsi_sdio_ta_reset rtw88: fix unassigned rssi_level in rtw_sta_info rtw88: fix subscript above array bounds compiler warning fuse: extract helper for range writeback fuse: fix copy_file_range() in the writeback case mmc: meson-gx: fix irq ack mmc: tmio: fix SCC error handling to avoid false positive CRC error mmc: tegra: Fix a warning message memstick: mspro_block: Fix an error code in mspro_block_issue_req() mac80211: mesh: fix RCU warning nl80211: fix station_info pertid memory leak mac80211: Do not use stack memory with scatterlist for GMAC ALSA: line6: Assure canceling delayed work at disconnection configfs: Fix use-after-free when accessing sd->s_dentry ALSA: hda - Force polling mode on CNL for fixing codec communication i2c: synquacer: fix synquacer_i2c_doxfer() return value i2c: mlxcpld: Fix wrong initialization order in probe i2c: dev: fix potential memory leak in i2cdev_ioctl_rdwr RDMA/core: Fix panic when port_data isn't initialized RDMA/uverbs: Pass udata on uverbs error unwind RDMA/core: Clear out the udata before error unwind net: aquantia: tcp checksum 0xffff being handled incorrectly net: aquantia: fix LRO with FCS error net: aquantia: check rx csum for all packets in LRO session net: aquantia: tx clean budget logic error vhost: scsi: add weight support vhost: vsock: add weight support vhost_net: fix possible infinite loop vhost: introduce vhost_exceeds_weight() virtio: Fix indentation of VIRTIO_MMIO virtio: add unlikely() to WARN_ON_ONCE() iommu/vt-d: Set the right field for Page Walk Snoop iommu/vt-d: Fix lock inversion between iommu->lock and device_domain_lock iommu: Add missing new line for dma type drm/etnaviv: lock MMU while dumping core block: Don't revalidate bdev of hidden gendisk loop: Don't change loop device under exclusive opener drm/imx: ipuv3-plane: fix atomic update status query for non-plus i.MX6Q drm/qxl: drop WARN_ONCE() iio: temperature: mlx90632 Relax the compatibility check iio: imu: st_lsm6dsx: fix PM support for st_lsm6dsx i2c controller staging:iio:ad7150: fix threshold mode config bit fuse: add FUSE_WRITE_KILL_PRIV fuse: fallocate: fix return with locked inode PCI: PM: Avoid possible suspend-to-idle issue ACPI: PM: Call pm_set_suspend_via_firmware() during hibernation ACPI/PCI: PM: Add missing wakeup.flags.valid checks ovl: support the FS_IOC_FS[SG]ETXATTR ioctls soundwire: stream: fix out of boundary access on port properties net: tulip: de4x5: Drop redundant MODULE_DEVICE_TABLE() selftests/tls: add test for sleeping even though there is data net/tls: fix no wakeup on partial reads selftests/tls: test for lowat overshoot with multiple records net/tls: fix lowat calculation if some data came from previous record dpaa2-eth: Make constant 64-bit long dpaa2-eth: Use PTR_ERR_OR_ZERO where appropriate dpaa2-eth: Fix potential spectre issue bonding/802.3ad: fix slave link initialization transition states io_uring: Fix __io_uring_register() false success net: ethtool: Document get_rxfh_context and set_rxfh_context ethtool ops net: stmmac: dwmac-mediatek: modify csr_clk value to fix mdio read/write fail net: stmmac: fix csr_clk can't be zero issue net: stmmac: update rx tail pointer register to fix rx dma hang issue. ip_sockglue: Fix missing-check bug in ip_ra_control() ipv6_sockglue: Fix a missing-check bug in ip6_ra_control() efi: Allow the number of EFI configuration tables entries to be zero efi/x86/Add missing error handling to old_memmap 1:1 mapping code parisc: Fix compiler warnings in float emulation code parisc/slab: cleanup after /proc/slab_allocators removal bpf: sockmap, fix use after free from sleep in psock backlog workqueue net: sched: don't use tc_action->order during action dump cxgb4: Revert "cxgb4: Remove SGE_HOST_PAGE_SIZE dependency on page size" net: fec: fix the clk mismatch in failed_reset path habanalabs: Avoid using a non-initialized MMU cache mutex habanalabs: fix debugfs code uapi/habanalabs: add opcode for enable/disable device debug mode habanalabs: halt debug engines on user process close selftests: rtc: rtctest: specify timeouts selftests/harness: Allow test to configure timeout selftests/ftrace: Add checkbashisms meta-testcase selftests/ftrace: Make a script checkbashisms clean media: smsusb: better handle optional alignment test_firmware: Use correct snprintf() limit genwqe: Prevent an integer overflow in the ioctl parport: Fix mem leak in parport_register_dev_model fpga: dfl: expand minor range when registering chrdev region fpga: dfl: Add lockdep classes for pdata->lock fpga: dfl: afu: Pass the correct device to dma_mapping_error() fpga: stratix10-soc: fix use-after-free on s10_init() w1: ds2408: Fix typo after 49695ac468 (reset on output_write retry with readback) kheaders: Do not regenerate archive if config is not changed kheaders: Move from proc to sysfs drm/amd/display: Don't load DMCU for Raven 1 (v2) drm/i915: Maintain consistent documentation subsection ordering scripts/sphinx-pre-install: make it handle Sphinx versions docs: Fix conf.py for Sphinx 2.0 vt/fbcon: deinitialize resources in visual_init() after failed memory allocation xfs: fix broken log reservation debugging clocksource/drivers/timer-ti-dm: Change to new style declaration ASoC: core: lock client_mutex while removing link components ASoC: simple-card: Restore original configuration of DAI format {nl,mac}80211: allow 4addr AP operation on crypto controlled devices mac80211_hwsim: mark expected switch fall-through mac80211: fix rate reporting inside cfg80211_calculate_bitrate_he() mac80211: remove set but not used variable 'old' mac80211: handle deauthentication/disassociation from TDLS peer gpio: fix gpio-adp5588 build errors pinctrl: stmfx: Fix compile issue when CONFIG_OF_GPIO is not defined staging: kpc2000: Add dependency on MFD_CORE to kconfig symbol 'KPC2000' perf/ring-buffer: Use regular variables for nesting perf/ring-buffer: Always use {READ,WRITE}_ONCE() for rb->user_page data perf/ring_buffer: Add ordering to rb->nest increment perf/ring_buffer: Fix exposing a temporarily decreased data_head x86/CPU/AMD: Don't force the CPB cap when running under a hypervisor x86/boot: Provide KASAN compatible aliases for string routines ALSA: hda/realtek - Enable micmute LED for Huawei laptops Input: uinput - add compat ioctl number translation for UI_*_FF_UPLOAD Input: silead - add MSSL0017 to acpi_device_id cxgb4: offload VLAN flows regardless of VLAN ethtype hsr: fix don't prune the master node from the node_db net: mvpp2: cls: Fix leaked ethtool_rx_flow_rule docs: fix multiple doc build warnings in enumeration.rst lib/list_sort: fix kerneldoc build error docs: fix numaperf.rst and add it to the doc tree doc: Cope with the deprecation of AutoReporter doc: Cope with Sphinx logging deprecations bpf: sockmap, restore sk_write_space when psock gets dropped selftests: bpf: add zero extend checks for ALU32 and/or/xor bpf, riscv: clear target register high 32-bits for and/or/xor on ALU32 spi: abort spi_sync if failed to prepare_transfer_hardware ALSA: hda/realtek - Set default power save node to 0 ipv4/igmp: fix build error if !CONFIG_IP_MULTICAST powerpc/kexec: Fix loading of kernel + initramfs with kexec_file_load() MIPS: TXx9: Fix boot crash in free_initmem() MIPS: remove a space after -I to cope with header search paths for VDSO MIPS: mark ginvt() as __always_inline ipv4/igmp: fix another memory leak in igmpv3_del_delrec() bnxt_en: Device serial number is supported only for PFs. bnxt_en: Reduce memory usage when running in kdump kernel. bnxt_en: Fix possible BUG() condition when calling pci_disable_msix(). bnxt_en: Fix aggregation buffer leak under OOM condition. ipv6: Fix redirect with VRF net: stmmac: fix reset gpio free missing mISDN: make sure device name is NUL terminated net: macb: save/restore the remaining registers and features media: dvb: warning about dvb frequency limits produces too much noise net/tls: don't ignore netdev notifications if no TLS features net/tls: fix state removal with feature flags off net/tls: avoid NULL-deref on resync during device removal Documentation: add TLS offload documentation Documentation: tls: RSTify the ktls documentation Documentation: net: move device drivers docs to a submenu mISDN: Fix indenting in dsp_cmx.c ocelot: Dont allocate another multicast list, use __dev_mc_sync Validate required parameters in inet6_validate_link_af xhci: Use %zu for printing size_t type xhci: Convert xhci_handshake() to use readl_poll_timeout_atomic() xhci: Fix immediate data transfer if buffer is already DMA mapped usb: xhci: avoid null pointer deref when bos field is NULL usb: xhci: Fix a potential null pointer dereference in xhci_debugfs_create_endpoint() xhci: update bounce buffer with correct sg num media: usb: siano: Fix false-positive "uninitialized variable" warning spi: spi-fsl-spi: call spi_finalize_current_message() at the end ALSA: hda/realtek - Check headset type by unplug and resume powerpc/perf: Fix MMCRA corruption by bhrb_filter powerpc/powernv: Return for invalid IMC domain HID: logitech-hidpp: Add support for the S510 remote control HID: multitouch: handle faulty Elo touch device selftests: netfilter: add flowtable test script netfilter: nft_flow_offload: IPCB is only valid for ipv4 family netfilter: nft_flow_offload: don't offload when sequence numbers need adjustment netfilter: nft_flow_offload: set liberal tracking mode for tcp netfilter: nf_flow_table: ignore DF bit setting ASoC: Intel: sof-rt5682: fix AMP quirk support ASoC: Intel: sof-rt5682: fix for codec button mapping clk: ti: clkctrl: Fix clkdm_clk handling clk: imx: imx8mm: fix int pll clk gate clk: sifive: restrict Kconfig scope for the FU540 PRCI driver RDMA/hns: Fix PD memory leak for internal allocation netfilter: nat: fix udp checksum corruption selftests: netfilter: missing error check when setting up veth interface RDMA/srp: Rename SRP sysfs name after IB device rename trigger ipvs: Fix use-after-free in ip_vs_in ARC: [plat-hsdk]: Add missing FIFO size entry in GMAC node ARC: [plat-hsdk]: Add missing multicast filter bins number to GMAC node samples, bpf: suppress compiler warning samples, bpf: fix to change the buffer size for read() bpf: Check sk_fullsock() before returning from bpf_sk_lookup() bpf: fix out-of-bounds read in __bpf_skc_lookup Documentation/networking: fix af_xdp.rst Sphinx warnings netfilter: nft_fib: Fix existence check support netfilter: nf_queue: fix reinject verdict handling dmaengine: sprd: Add interrupt support for 2-stage transfer dmaengine: sprd: Fix the right place to configure 2-stage transfer dmaengine: sprd: Fix block length overflow dmaengine: sprd: Fix the incorrect start for 2-stage destination channels dmaengine: sprd: Add validation of current descriptor in irq handler dmaengine: sprd: Fix the possible crash when getting descriptor status tty: max310x: Fix external crystal register setup serial: sh-sci: disable DMA for uart_console serial: imx: remove log spamming error message tty: serial: msm_serial: Fix XON/XOFF USB: serial: option: add Telit 0x1260 and 0x1261 compositions USB: serial: pl2303: add Allied Telesis VT-Kit3 USB: serial: option: add support for Simcom SIM7500/SIM7600 RNDIS mode dmaengine: tegra210-adma: Fix spelling dmaengine: tegra210-adma: Fix channel FIFO configuration dmaengine: tegra210-adma: Fix crash during probe dmaengine: mediatek-cqdma: sleeping in atomic context dmaengine: dw-axi-dmac: fix null dereference when pointer first is null perf/x86/intel/ds: Fix EVENT vs. UEVENT PEBS constraints USB: rio500: update Documentation USB: rio500: simplify locking USB: rio500: fix memory leak in close after disconnect USB: rio500: refuse more than one device at a time usbip: usbip_host: fix BUG: sleeping function called from invalid context USB: sisusbvga: fix oops in error path of sisusb_probe USB: Add LPM quirk for Surface Dock GigE adapter media: usb: siano: Fix general protection fault in smsusb usb: mtu3: fix up undefined reference to usb_debug_root USB: Fix slab-out-of-bounds write in usb_get_bos_descriptor Input: elantech - enable middle button support on 2 ThinkPads dmaengine: fsl-qdma: Add improvement dmaengine: jz4780: Fix transfers being ACKed too soon gcc-plugins: Fix build failures under Darwin host MAINTAINERS: Update Stefan Wahren email address netfilter: nf_tables: fix oops during rule dump ARC: mm: SIGSEGV userspace trying to access kernel virtual memory ARC: fix build warnings ARM: dts: bcm: Add missing device_type = "memory" property soc: bcm: brcmstb: biuctrl: Register writes require a barrier soc: brcmstb: Fix error path for unsupported CPUs ARM: dts: dra71x: Disable usb4_tm target module ARM: dts: dra71x: Disable rtc target module ARM: dts: dra76x: Disable usb4_tm target module ARM: dts: dra76x: Disable rtc target module ASoC: simple-card: Fix configuration of DAI format ASoC: Intel: soc-acpi: Fix machine selection order ASoC: rt5677-spi: Handle over reading when flipping bytes ASoC: soc-dpm: fixup DAI active unbalance pinctrl: intel: Clear interrupt status in mask/unmask callback pinctrl: intel: Use GENMASK() consistently parisc: Allow building 64-bit kernel without -mlong-calls compiler option parisc: Kconfig: remove ARCH_DISCARD_MEMBLOCK staging: wilc1000: Fix some double unlock bugs in wilc_wlan_cleanup() staging: vc04_services: prevent integer overflow in create_pagelist() Staging: vc04_services: Fix a couple error codes staging: wlan-ng: fix adapter initialization failure staging: kpc2000: double unlock in error handling in kpc_dma_transfer() staging: kpc2000: Fix build error without CONFIG_UIO staging: kpc2000: fix build error on xtensa staging: erofs: set sb->s_root to NULL when failing from __getname() ARM: imx: cpuidle-imx6sx: Restrict the SW2ISO increase to i.MX6SX firmware: imx: SCU irq should ONLY be enabled after SCU IPC is ready arm64: imx: Fix build error without CONFIG_SOC_BUS ima: fix wrong signed policy requirement when not appraising x86/ima: Check EFI_RUNTIME_SERVICES before using stacktrace: Unbreak stack_trace_save_tsk_reliable() HID: wacom: Sync INTUOSP2_BT touch state after each frame if necessary HID: wacom: Correct button numbering 2nd-gen Intuos Pro over Bluetooth HID: wacom: Send BTN_TOUCH in response to INTUOSP2_BT eraser contact HID: wacom: Don't report anything prior to the tool entering range HID: wacom: Don't set tool type until we're in range ASoC: cs42xx8: Add regcache mask dirty regulator: tps6507x: Fix boot regression due to testing wrong init_data pointer ASoC: fsl_asrc: Fix the issue about unsupported rate spi: bitbang: Fix NULL pointer dereference in spi_unregister_master Input: elan_i2c - increment wakeup count if wake source wireless: Skip directory when generating certificates ASoC: ak4458: rstn_control - return a non-zero on error only ASoC: soc-pcm: BE dai needs prepare when pause release after resume ASoC: ak4458: add return value for ak4458_probe ASoC : cs4265 : readable register too low ASoC: SOF: fix error in verbose ipc command parsing ASoC: SOF: fix race in FW boot timeout handling ASoC: SOF: nocodec: fix undefined reference iio: adc: ti-ads8688: fix timestamp is not updated in buffer iio: dac: ds4422/ds4424 fix chip verification HID: rmi: Use SET_REPORT request on control endpoint for Acer Switch 3 and 5 HID: logitech-hidpp: add support for the MX5500 keyboard HID: logitech-dj: add support for the Logitech MX5500's Bluetooth Mini-Receiver HID: i2c-hid: add iBall Aer3 to descriptor override spi: Fix Raspberry Pi breakage ARM: dts: dra76x: Update MMC2_HS200_MANUAL1 iodelay values ARM: dts: am57xx-idk: Remove support for voltage switching for SD card bus: ti-sysc: Handle devices with no control registers ARM: dts: Configure osc clock for d_can on am335x iio: imu: mpu6050: Fix FIFO layout for ICM20602 lkdtm/bugs: Adjust recursion test to avoid elision lkdtm/usercopy: Moves the KERNEL_DS test to non-canonical iio: adc: ads124: avoid buffer overflow iio: adc: modify NPCM ADC read reference voltage Change-Id: I98c823993370027391cc21dfb239c3049f025136 Signed-off-by: Raghavendra Rao Ananta <rananta@codeaurora.org>	2019-07-01 17:41:24 -07:00
Waiman Long	ad53fa10fa	locking/qspinlock_stat: Introduce generic lockevent_*() counting APIs ... The percpu event counts used by qspinlock code can be useful for other locking code as well. So a new set of lockevent_* counting APIs is introduced with the lock event names extracted out into the new lock_events_list.h header file for easier addition in the future. The existing qstat_inc() calls are replaced by either lockevent_inc() or lockevent_cond_inc() calls. The qstat_hop() call is renamed to lockevent_pv_hop(). The "reset_counters" debugfs file is also renamed to ".reset_counts". Signed-off-by: Waiman Long <longman@redhat.com> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Acked-by: Davidlohr Bueso <dbueso@suse.de> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Borislav Petkov <bp@alien8.de> Cc: Davidlohr Bueso <dave@stgolabs.net> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Tim Chen <tim.c.chen@linux.intel.com> Cc: Will Deacon <will.deacon@arm.com> Link: http://lkml.kernel.org/r/20190404174320.22416-8-longman@redhat.com Signed-off-by: Ingo Molnar <mingo@kernel.org>	2019-04-10 10:56:03 +02:00
Waiman Long	733000c7ff	locking/qspinlock: Remove unnecessary BUG_ON() call ... With the > 4 nesting levels case handled by the commit: d682b596d9 ("locking/qspinlock: Handle > 4 slowpath nesting levels") the BUG_ON() call in encode_tail() will never actually be triggered. Remove it. Signed-off-by: Waiman Long <longman@redhat.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Will Deacon <will.deacon@arm.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: https://lkml.kernel.org/r/1551057253-3231-1-git-send-email-longman@redhat.com Signed-off-by: Ingo Molnar <mingo@kernel.org>	2019-02-28 07:55:38 +01:00
Waiman Long	412f34a82c	locking/qspinlock_stat: Track the no MCS node available case ... Track the number of slowpath locking operations that are being done without any MCS node available as well renaming lock_index[123] to make them more descriptive. Using these stat counters is one way to find out if a code path is being exercised. Signed-off-by: Waiman Long <longman@redhat.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Borislav Petkov <bp@alien8.de> Cc: H. Peter Anvin <hpa@zytor.com> Cc: James Morse <james.morse@arm.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: SRINIVAS <srinivas.eeda@oracle.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Will Deacon <will.deacon@arm.com> Cc: Zhenzhong Duan <zhenzhong.duan@oracle.com> Link: https://lkml.kernel.org/r/1548798828-16156-3-git-send-email-longman@redhat.com Signed-off-by: Ingo Molnar <mingo@kernel.org>	2019-02-04 09:03:30 +01:00
Waiman Long	d682b596d9	locking/qspinlock: Handle > 4 slowpath nesting levels ... Four queue nodes per CPU are allocated to enable up to 4 nesting levels using the per-CPU nodes. Nested NMIs are possible in some architectures. Still it is very unlikely that we will ever hit more than 4 nested levels with contention in the slowpath. When that rare condition happens, however, it is likely that the system will hang or crash shortly after that. It is not good and we need to handle this exception case. This is done by spinning directly on the lock using repeated trylock. This alternative code path should only be used when there is nested NMIs. Assuming that the locks used by those NMI handlers will not be heavily contended, a simple TAS locking should work out. Suggested-by: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Waiman Long <longman@redhat.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Will Deacon <will.deacon@arm.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Borislav Petkov <bp@alien8.de> Cc: H. Peter Anvin <hpa@zytor.com> Cc: James Morse <james.morse@arm.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: SRINIVAS <srinivas.eeda@oracle.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Zhenzhong Duan <zhenzhong.duan@oracle.com> Link: https://lkml.kernel.org/r/1548798828-16156-2-git-send-email-longman@redhat.com Signed-off-by: Ingo Molnar <mingo@kernel.org>	2019-02-04 09:03:29 +01:00
Waiman Long	0fa809ca7f	locking/pvqspinlock: Extend node size when pvqspinlock is configured ... The qspinlock code supports up to 4 levels of slowpath nesting using four per-CPU mcs_spinlock structures. For 64-bit architectures, they fit nicely in one 64-byte cacheline. For para-virtualized (PV) qspinlocks it needs to store more information in the per-CPU node structure than there is space for. It uses a trick to use a second cacheline to hold the extra information that it needs. So PV qspinlock needs to access two extra cachelines for its information whereas the native qspinlock code only needs one extra cacheline. Freshly added counter profiling of the qspinlock code, however, revealed that it was very rare to use more than two levels of slowpath nesting. So it doesn't make sense to penalize PV qspinlock code in order to have four mcs_spinlock structures in the same cacheline to optimize for a case in the native qspinlock code that rarely happens. Extend the per-CPU node structure to have two more long words when PV qspinlock locks are configured to hold the extra data that it needs. As a result, the PV qspinlock code will enjoy the same benefit of using just one extra cacheline like the native counterpart, for most cases. [ mingo: Minor changelog edits. ] Signed-off-by: Waiman Long <longman@redhat.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Will Deacon <will.deacon@arm.com> Link: http://lkml.kernel.org/r/1539697507-28084-2-git-send-email-longman@redhat.com Signed-off-by: Ingo Molnar <mingo@kernel.org>	2018-10-17 08:37:32 +02:00
Waiman Long	1222109a53	locking/qspinlock_stat: Count instances of nested lock slowpaths ... Queued spinlock supports up to 4 levels of lock slowpath nesting - user context, soft IRQ, hard IRQ and NMI. However, we are not sure how often the nesting happens. So add 3 more per-CPU stat counters to track the number of instances where nesting index goes to 1, 2 and 3 respectively. On a dual-socket 64-core 128-thread Zen server, the following were the new stat counter values under different circumstances: State slowpath index1 index2 index3 ----- -------- ------ ------ ------- After bootup 1,012,150 82 0 0 After parallel build + perf-top 125,195,009 82 0 0 So the chance of having more than 2 levels of nesting is extremely low. [ mingo: Minor changelog edits. ] Signed-off-by: Waiman Long <longman@redhat.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Will Deacon <will.deacon@arm.com> Link: http://lkml.kernel.org/r/1539697507-28084-1-git-send-email-longman@redhat.com Signed-off-by: Ingo Molnar <mingo@kernel.org>	2018-10-17 08:37:31 +02:00
Peter Zijlstra	7aa54be297	locking/qspinlock, x86: Provide liveness guarantee ... On x86 we cannot do fetch_or() with a single instruction and thus end up using a cmpxchg loop, this reduces determinism. Replace the fetch_or() with a composite operation: tas-pending + load. Using two instructions of course opens a window we previously did not have. Consider the scenario: CPU0 CPU1 CPU2 1) lock trylock -> (0,0,1) 2) lock trylock /* fail */ 3) unlock -> (0,0,0) 4) lock trylock -> (0,0,1) 5) tas-pending -> (0,1,1) load-val <- (0,1,0) from 3 6) clear-pending-set-locked -> (0,0,1) FAIL: _2_ owners where 5) is our new composite operation. When we consider each part of the qspinlock state as a separate variable (as we can when _Q_PENDING_BITS == 8) then the above is entirely possible, because tas-pending will only RmW the pending byte, so the later load is able to observe prior tail and lock state (but not earlier than its own trylock, which operates on the whole word, due to coherence). To avoid this we need 2 things: - the load must come after the tas-pending (obviously, otherwise it can trivially observe prior state). - the tas-pending must be a full word RmW instruction, it cannot be an XCHGB for example, such that we cannot observe other state prior to setting pending. On x86 we can realize this by using "LOCK BTS m32, r32" for tas-pending followed by a regular load. Note that observing later state is not a problem: - if we fail to observe a later unlock, we'll simply spin-wait for that store to become visible. - if we observe a later xchg_tail(), there is no difference from that xchg_tail() having taken place before the tas-pending. Suggested-by: Will Deacon <will.deacon@arm.com> Reported-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Will Deacon <will.deacon@arm.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: andrea.parri@amarulasolutions.com Cc: longman@redhat.com Fixes: 59fb586b4a ("locking/qspinlock: Remove unbounded cmpxchg() loop from locking slowpath") Link: https://lkml.kernel.org/r/20181003130957.183726335@infradead.org Signed-off-by: Ingo Molnar <mingo@kernel.org>	2018-10-16 17:33:54 +02:00
Peter Zijlstra	756b1df4c2	locking/qspinlock: Rework some comments ... While working my way through the code again; I felt the comments could use help. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Will Deacon <will.deacon@arm.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: andrea.parri@amarulasolutions.com Cc: longman@redhat.com Link: https://lkml.kernel.org/r/20181003130257.156322446@infradead.org Signed-off-by: Ingo Molnar <mingo@kernel.org>	2018-10-16 17:33:54 +02:00
Peter Zijlstra	53bf57fab7	locking/qspinlock: Re-order code ... Flip the branch condition after atomic_fetch_or_acquire(_Q_PENDING_VAL) such that we loose the indent. This also result in a more natural code flow IMO. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Will Deacon <will.deacon@arm.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: andrea.parri@amarulasolutions.com Cc: longman@redhat.com Link: https://lkml.kernel.org/r/20181003130257.156322446@infradead.org Signed-off-by: Ingo Molnar <mingo@kernel.org>	2018-10-16 17:33:53 +02:00
Waiman Long	81d3dc9a34	locking/qspinlock: Add stat tracking for pending vs. slowpath ... Currently, the qspinlock_stat code tracks only statistical counts in the PV qspinlock code. However, it may also be useful to track the number of locking operations done via the pending code vs. the MCS lock queue slowpath for the non-PV case. The qspinlock stat code is modified to do that. The stat counter pv_lock_slowpath is renamed to lock_slowpath so that it can be used by both the PV and non-PV cases. Signed-off-by: Waiman Long <longman@redhat.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Waiman Long <longman@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: boqun.feng@gmail.com Cc: linux-arm-kernel@lists.infradead.org Cc: paulmck@linux.vnet.ibm.com Cc: will.deacon@arm.com Link: http://lkml.kernel.org/r/1524738868-31318-14-git-send-email-will.deacon@arm.com Signed-off-by: Ingo Molnar <mingo@kernel.org>	2018-04-27 09:48:53 +02:00
Will Deacon	ae75d9089f	locking/qspinlock: Use try_cmpxchg() instead of cmpxchg() when locking ... When reaching the head of an uncontended queue on the qspinlock slow-path, using a try_cmpxchg() instead of a cmpxchg() operation to transition the lock work to _Q_LOCKED_VAL generates slightly better code for x86 and pretty much identical code for arm64. Reported-by: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Will Deacon <will.deacon@arm.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Waiman Long <longman@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: boqun.feng@gmail.com Cc: linux-arm-kernel@lists.infradead.org Cc: paulmck@linux.vnet.ibm.com Link: http://lkml.kernel.org/r/1524738868-31318-13-git-send-email-will.deacon@arm.com Signed-off-by: Ingo Molnar <mingo@kernel.org>	2018-04-27 09:48:52 +02:00
Will Deacon	9d4646d14d	locking/qspinlock: Elide back-to-back RELEASE operations with smp_wmb() ... The qspinlock slowpath must ensure that the MCS node is fully initialised before it can be reached by another other CPU. This is currently enforced by using a RELEASE operation when updating the tail and also when linking the node into the waitqueue, since the control dependency off xchg_tail is insufficient to enforce sufficient ordering, see: 95bcade33a ("locking/qspinlock: Ensure node is initialised before updating prev->next") Back-to-back RELEASE operations may be expensive on some architectures, particularly those that implement them using fences under the hood. We can replace the two RELEASE operations with a single smp_wmb() fence and use RELAXED operations for the subsequent publishing of the node. Signed-off-by: Will Deacon <will.deacon@arm.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Waiman Long <longman@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: boqun.feng@gmail.com Cc: linux-arm-kernel@lists.infradead.org Cc: paulmck@linux.vnet.ibm.com Link: http://lkml.kernel.org/r/1524738868-31318-12-git-send-email-will.deacon@arm.com Signed-off-by: Ingo Molnar <mingo@kernel.org>	2018-04-27 09:48:52 +02:00
Will Deacon	c131a198c4	locking/qspinlock: Use smp_cond_load_relaxed() to wait for next node ... When a locker reaches the head of the queue and takes the lock, a concurrent locker may enqueue and force the lock holder to spin whilst its node->next field is initialised. Rather than open-code a READ_ONCE/cpu_relax() loop, this can be implemented using smp_cond_load_relaxed() instead. Signed-off-by: Will Deacon <will.deacon@arm.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Waiman Long <longman@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: boqun.feng@gmail.com Cc: linux-arm-kernel@lists.infradead.org Cc: paulmck@linux.vnet.ibm.com Link: http://lkml.kernel.org/r/1524738868-31318-10-git-send-email-will.deacon@arm.com Signed-off-by: Ingo Molnar <mingo@kernel.org>	2018-04-27 09:48:50 +02:00
Will Deacon	f9c811fac4	locking/qspinlock: Use atomic_cond_read_acquire() ... Rather than dig into the counter field of the atomic_t inside the qspinlock structure so that we can call smp_cond_load_acquire(), use atomic_cond_read_acquire() instead, which operates on the atomic_t directly. Signed-off-by: Will Deacon <will.deacon@arm.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Waiman Long <longman@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: boqun.feng@gmail.com Cc: linux-arm-kernel@lists.infradead.org Cc: paulmck@linux.vnet.ibm.com Link: http://lkml.kernel.org/r/1524738868-31318-8-git-send-email-will.deacon@arm.com Signed-off-by: Ingo Molnar <mingo@kernel.org>	2018-04-27 09:48:49 +02:00
Will Deacon	c61da58d8a	locking/qspinlock: Kill cmpxchg() loop when claiming lock from head of queue ... When a queued locker reaches the head of the queue, it claims the lock by setting _Q_LOCKED_VAL in the lockword. If there isn't contention, it must also clear the tail as part of this operation so that subsequent lockers can avoid taking the slowpath altogether. Currently this is expressed as a cmpxchg() loop that practically only runs up to two iterations. This is confusing to the reader and unhelpful to the compiler. Rewrite the cmpxchg() loop without the loop, so that a failed cmpxchg() implies that there is contention and we just need to write to _Q_LOCKED_VAL without considering the rest of the lockword. Signed-off-by: Will Deacon <will.deacon@arm.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Waiman Long <longman@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: boqun.feng@gmail.com Cc: linux-arm-kernel@lists.infradead.org Cc: paulmck@linux.vnet.ibm.com Link: http://lkml.kernel.org/r/1524738868-31318-7-git-send-email-will.deacon@arm.com Signed-off-by: Ingo Molnar <mingo@kernel.org>	2018-04-27 09:48:48 +02:00
Will Deacon	59fb586b4a	locking/qspinlock: Remove unbounded cmpxchg() loop from locking slowpath ... The qspinlock locking slowpath utilises a "pending" bit as a simple form of an embedded test-and-set lock that can avoid the overhead of explicit queuing in cases where the lock is held but uncontended. This bit is managed using a cmpxchg() loop which tries to transition the uncontended lock word from (0,0,0) -> (0,0,1) or (0,0,1) -> (0,1,1). Unfortunately, the cmpxchg() loop is unbounded and lockers can be starved indefinitely if the lock word is seen to oscillate between unlocked (0,0,0) and locked (0,0,1). This could happen if concurrent lockers are able to take the lock in the cmpxchg() loop without queuing and pass it around amongst themselves. This patch fixes the problem by unconditionally setting _Q_PENDING_VAL using atomic_fetch_or, and then inspecting the old value to see whether we need to spin on the current lock owner, or whether we now effectively hold the lock. The tricky scenario is when concurrent lockers end up queuing on the lock and the lock becomes available, causing us to see a lockword of (n,0,0). With pending now set, simply queuing could lead to deadlock as the head of the queue may not have observed the pending flag being cleared. Conversely, if the head of the queue did observe pending being cleared, then it could transition the lock from (n,0,0) -> (0,0,1) meaning that any attempt to "undo" our setting of the pending bit could race with a concurrent locker trying to set it. We handle this race by preserving the pending bit when taking the lock after reaching the head of the queue and leaving the tail entry intact if we saw pending set, because we know that the tail is going to be updated shortly. Signed-off-by: Will Deacon <will.deacon@arm.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Waiman Long <longman@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: boqun.feng@gmail.com Cc: linux-arm-kernel@lists.infradead.org Cc: paulmck@linux.vnet.ibm.com Link: http://lkml.kernel.org/r/1524738868-31318-6-git-send-email-will.deacon@arm.com Signed-off-by: Ingo Molnar <mingo@kernel.org>	2018-04-27 09:48:47 +02:00
Will Deacon	6512276d97	locking/qspinlock: Bound spinning on pending->locked transition in slowpath ... If a locker taking the qspinlock slowpath reads a lock value indicating that only the pending bit is set, then it will spin whilst the concurrent pending->locked transition takes effect. Unfortunately, there is no guarantee that such a transition will ever be observed since concurrent lockers could continuously set pending and hand over the lock amongst themselves, leading to starvation. Whilst this would probably resolve in practice, it means that it is not possible to prove liveness properties about the lock and means that lock acquisition time is unbounded. Rather than removing the pending->locked spinning from the slowpath altogether (which has been shown to heavily penalise a 2-threaded locking stress test on x86), this patch replaces the explicit spinning with a call to atomic_cond_read_relaxed and allows the architecture to provide a bound on the number of spins. For architectures that can respond to changes in cacheline state in their smp_cond_load implementation, it should be sufficient to use the default bound of 1. Suggested-by: Waiman Long <longman@redhat.com> Signed-off-by: Will Deacon <will.deacon@arm.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Waiman Long <longman@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: boqun.feng@gmail.com Cc: linux-arm-kernel@lists.infradead.org Cc: paulmck@linux.vnet.ibm.com Link: http://lkml.kernel.org/r/1524738868-31318-4-git-send-email-will.deacon@arm.com Signed-off-by: Ingo Molnar <mingo@kernel.org>	2018-04-27 09:48:46 +02:00
Will Deacon	625e88be1f	locking/qspinlock: Merge 'struct __qspinlock' into 'struct qspinlock' ... 'struct __qspinlock' provides a handy union of fields so that subcomponents of the lockword can be accessed by name, without having to manage shifts and masks explicitly and take endianness into account. This is useful in qspinlock.h and also potentially in arch headers, so move the 'struct __qspinlock' into 'struct qspinlock' and kill the extra definition. Signed-off-by: Will Deacon <will.deacon@arm.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Acked-by: Waiman Long <longman@redhat.com> Acked-by: Boqun Feng <boqun.feng@gmail.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-arm-kernel@lists.infradead.org Cc: paulmck@linux.vnet.ibm.com Link: http://lkml.kernel.org/r/1524738868-31318-3-git-send-email-will.deacon@arm.com Signed-off-by: Ingo Molnar <mingo@kernel.org>	2018-04-27 09:48:45 +02:00
Will Deacon	11dc13224c	locking/qspinlock: Ensure node->count is updated before initialising node ... When queuing on the qspinlock, the count field for the current CPU's head node is incremented. This needn't be atomic because locking in e.g. IRQ context is balanced and so an IRQ will return with node->count as it found it. However, the compiler could in theory reorder the initialisation of node[idx] before the increment of the head node->count, causing an IRQ to overwrite the initialised node and potentially corrupt the lock state. Avoid the potential for this harmful compiler reordering by placing a barrier() between the increment of the head node->count and the subsequent node initialisation. Signed-off-by: Will Deacon <will.deacon@arm.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1518528177-19169-3-git-send-email-will.deacon@arm.com Signed-off-by: Ingo Molnar <mingo@kernel.org>	2018-02-13 14:50:14 +01:00
Will Deacon	95bcade33a	locking/qspinlock: Ensure node is initialised before updating prev->next ... When a locker ends up queuing on the qspinlock locking slowpath, we initialise the relevant mcs node and publish it indirectly by updating the tail portion of the lock word using xchg_tail. If we find that there was a pre-existing locker in the queue, we subsequently update their ->next field to point at our node so that we are notified when it's our turn to take the lock. This can be roughly illustrated as follows: /* Initialise the fields in node and encode a pointer to node in tail */ tail = initialise_node(node); /* * Exchange tail into the lockword using an atomic read-modify-write * operation with release semantics */ old = xchg_tail(lock, tail); /* If there was a pre-existing waiter ... */ if (old & _Q_TAIL_MASK) { prev = decode_tail(old); smp_read_barrier_depends(); /* ... then update their ->next field to point to node. WRITE_ONCE(prev->next, node); } The conditional update of prev->next therefore relies on the address dependency from the result of xchg_tail ensuring order against the prior initialisation of node. However, since the release semantics of the xchg_tail operation apply only to the write portion of the RmW, then this ordering is not guaranteed and it is possible for the CPU to return old before the writes to node have been published, consequently allowing us to point prev->next to an uninitialised node. This patch fixes the problem by making the update of prev->next a RELEASE operation, which also removes the reliance on dependency ordering. Signed-off-by: Will Deacon <will.deacon@arm.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1518528177-19169-2-git-send-email-will.deacon@arm.com Signed-off-by: Ingo Molnar <mingo@kernel.org>	2018-02-13 14:50:14 +01:00
Paul E. McKenney	548095dea6	locking: Remove smp_read_barrier_depends() from queued_spin_lock_slowpath() ... Queued spinlocks are not used by DEC Alpha, and furthermore operations such as READ_ONCE() and release/relaxed RMW atomics are being changed to imply smp_read_barrier_depends(). This commit therefore removes the now-redundant smp_read_barrier_depends() from queued_spin_lock_slowpath(), and adjusts the comments accordingly. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ingo Molnar <mingo@redhat.com>	2017-12-04 10:52:55 -08:00
Paul E. McKenney	d3a024abbc	locking: Remove spin_unlock_wait() generic definitions ... There is no agreed-upon definition of spin_unlock_wait()'s semantics, and it appears that all callers could do just as well with a lock/unlock pair. This commit therefore removes spin_unlock_wait() and related definitions from core code. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Ingo Molnar <mingo@redhat.com> Cc: Will Deacon <will.deacon@arm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Alan Stern <stern@rowland.harvard.edu> Cc: Andrea Parri <parri.andrea@gmail.com> Cc: Linus Torvalds <torvalds@linux-foundation.org>	2017-08-17 08:08:58 -07:00
Stafford Horne	5671360f29	locking/qspinlock: Explicitly include asm/prefetch.h ... In architectures that use qspinlock, like x86, prefetch is loaded indirectly via the asm/qspinlock.h include. On other architectures, like OpenRISC, which may want to use asm-generic/qspinlock.h the built will fail without the asm/prefetch.h include. Fix this by including directly. Signed-off-by: Stafford Horne <shorne@gmail.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/20170707195658.23840-1-shorne@gmail.com Signed-off-by: Ingo Molnar <mingo@kernel.org>	2017-07-08 11:01:11 +02:00
Pan Xinhui	0dceeaf599	locking/qspinlock: Use __this_cpu_dec() instead of full-blown this_cpu_dec() ... queued_spin_lock_slowpath() should not worry about another queued_spin_lock_slowpath() running in interrupt context and changing node->count by accident, because node->count keeps the same value every time we enter/leave queued_spin_lock_slowpath(). On some architectures this_cpu_dec() will save/restore irq flags, which has high overhead. Use the much cheaper __this_cpu_dec() instead. Signed-off-by: Pan Xinhui <xinhui.pan@linux.vnet.ibm.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Waiman.Long@hpe.com Link: http://lkml.kernel.org/r/1465886247-3773-1-git-send-email-xinhui.pan@linux.vnet.ibm.com [ Rewrote changelog. ] Signed-off-by: Ingo Molnar <mingo@kernel.org>	2016-06-27 11:37:41 +02:00
Peter Zijlstra	33ac279677	locking/barriers: Introduce smp_acquire__after_ctrl_dep() ... Introduce smp_acquire__after_ctrl_dep(), this construct is not uncommon, but the lack of this barrier is. Use it to better express smp_rmb() uses in WRITE_ONCE(), the IPC semaphore code and the qspinlock code. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>	2016-06-14 11:55:14 +02:00
Peter Zijlstra	1f03e8d291	locking/barriers: Replace smp_cond_acquire() with smp_cond_load_acquire() ... This new form allows using hardware assisted waiting. Some hardware (ARM64 and x86) allow monitoring an address for changes, so by providing a pointer we can use this to replace the cpu_relax() with hardware optimized methods in the future. Requested-by: Will Deacon <will.deacon@arm.com> Suggested-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@kernel.org>	2016-06-14 11:54:27 +02:00
Peter Zijlstra	055ce0fd1b	locking/qspinlock: Add comments ... I figured we need to document the spin_is_locked() and spin_unlock_wait() constraints somwehere. Ideally 'someone' would rewrite Documentation/atomic_ops.txt and we could find a place in there. But currently that document is stale to the point of hardly being useful. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Boqun Feng <boqun.feng@gmail.com> Cc: Davidlohr Bueso <dave@stgolabs.net> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Pan Xinhui <xinhui.pan@linux.vnet.ibm.com> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Waiman Long <waiman.long@hpe.com> Cc: Will Deacon <will.deacon@arm.com> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>	2016-06-08 14:44:01 +02:00
Peter Zijlstra	8d53fa1904	locking/qspinlock: Clarify xchg_tail() ordering ... While going over the code I noticed that xchg_tail() is a RELEASE but had no obvious pairing commented. It pairs with a somewhat unique address dependency through decode_tail(). So the store-release of xchg_tail() is paired by the address dependency of the load of xchg_tail followed by the dereference from the pointer computed from that load. The @old -> @prev transformation itself is pure, and therefore does not depend on external state, so that is immaterial wrt. ordering. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Boqun Feng <boqun.feng@gmail.com> Cc: Davidlohr Bueso <dave@stgolabs.net> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Pan Xinhui <xinhui.pan@linux.vnet.ibm.com> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Waiman Long <waiman.long@hpe.com> Cc: Will Deacon <will.deacon@arm.com> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>	2016-06-08 14:44:00 +02:00
Peter Zijlstra	2c61002271	locking/qspinlock: Fix spin_unlock_wait() some more ... While this prior commit: 54cf809b95 ("locking,qspinlock: Fix spin_is_locked() and spin_unlock_wait()") ... fixes spin_is_locked() and spin_unlock_wait() for the usage in ipc/sem and netfilter, it does not in fact work right for the usage in task_work and futex. So while the 2 locks crossed problem: spin_lock(A) spin_lock(B) if (!spin_is_locked(B)) spin_unlock_wait(A) foo() foo(); ... works with the smp_mb() injected by both spin_is_locked() and spin_unlock_wait(), this is not sufficient for: flag = 1; smp_mb(); spin_lock() spin_unlock_wait() if (!flag) // add to lockless list // iterate lockless list ... because in this scenario, the store from spin_lock() can be delayed past the load of flag, uncrossing the variables and loosing the guarantee. This patch reworks spin_is_locked() and spin_unlock_wait() to work in both cases by exploiting the observation that while the lock byte store can be delayed, the contender must have registered itself visibly in other state contained in the word. It also allows for architectures to override both functions, as PPC and ARM64 have an additional issue for which we currently have no generic solution. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Boqun Feng <boqun.feng@gmail.com> Cc: Davidlohr Bueso <dave@stgolabs.net> Cc: Giovanni Gherdovich <ggherdovich@suse.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Pan Xinhui <xinhui.pan@linux.vnet.ibm.com> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Waiman Long <waiman.long@hpe.com> Cc: Will Deacon <will.deacon@arm.com> Cc: stable@vger.kernel.org # v4.2 and later Fixes: 54cf809b95 ("locking,qspinlock: Fix spin_is_locked() and spin_unlock_wait()") Signed-off-by: Ingo Molnar <mingo@kernel.org>	2016-06-08 14:29:08 +02:00
Waiman Long	cb037fdad6	locking/qspinlock: Use smp_cond_acquire() in pending code ... The newly introduced smp_cond_acquire() was used to replace the slowpath lock acquisition loop. Similarly, the new function can also be applied to the pending bit locking loop. This patch uses the new function in that loop. Signed-off-by: Waiman Long <Waiman.Long@hpe.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Douglas Hatch <doug.hatch@hpe.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Scott J Norton <scott.norton@hpe.com> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1449778666-13593-1-git-send-email-Waiman.Long@hpe.com Signed-off-by: Ingo Molnar <mingo@kernel.org>	2016-02-29 10:02:42 +01:00
Waiman Long	cd0272fab7	locking/pvqspinlock: Queue node adaptive spinning ... In an overcommitted guest where some vCPUs have to be halted to make forward progress in other areas, it is highly likely that a vCPU later in the spinlock queue will be spinning while the ones earlier in the queue would have been halted. The spinning in the later vCPUs is then just a waste of precious CPU cycles because they are not going to get the lock soon as the earlier ones have to be woken up and take their turn to get the lock. This patch implements an adaptive spinning mechanism where the vCPU will call pv_wait() if the previous vCPU is not running. Linux kernel builds were run in KVM guest on an 8-socket, 4 cores/socket Westmere-EX system and a 4-socket, 8 cores/socket Haswell-EX system. Both systems are configured to have 32 physical CPUs. The kernel build times before and after the patch were: Westmere Haswell Patch 32 vCPUs 48 vCPUs 32 vCPUs 48 vCPUs ----- -------- -------- -------- -------- Before patch 3m02.3s 5m00.2s 1m43.7s 3m03.5s After patch 3m03.0s 4m37.5s 1m43.0s 2m47.2s For 32 vCPUs, this patch doesn't cause any noticeable change in performance. For 48 vCPUs (over-committed), there is about 8% performance improvement. Signed-off-by: Waiman Long <Waiman.Long@hpe.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Davidlohr Bueso <dave@stgolabs.net> Cc: Douglas Hatch <doug.hatch@hpe.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Scott J Norton <scott.norton@hpe.com> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1447114167-47185-8-git-send-email-Waiman.Long@hpe.com Signed-off-by: Ingo Molnar <mingo@kernel.org>	2015-12-04 11:39:51 +01:00
Waiman Long	1c4941fd53	locking/pvqspinlock: Allow limited lock stealing ... This patch allows one attempt for the lock waiter to steal the lock when entering the PV slowpath. To prevent lock starvation, the pending bit will be set by the queue head vCPU when it is in the active lock spinning loop to disable any lock stealing attempt. This helps to reduce the performance penalty caused by lock waiter preemption while not having much of the downsides of a real unfair lock. The pv_wait_head() function was renamed as pv_wait_head_or_lock() as it was modified to acquire the lock before returning. This is necessary because of possible lock stealing attempts from other tasks. Linux kernel builds were run in KVM guest on an 8-socket, 4 cores/socket Westmere-EX system and a 4-socket, 8 cores/socket Haswell-EX system. Both systems are configured to have 32 physical CPUs. The kernel build times before and after the patch were: Westmere Haswell Patch 32 vCPUs 48 vCPUs 32 vCPUs 48 vCPUs ----- -------- -------- -------- -------- Before patch 3m15.6s 10m56.1s 1m44.1s 5m29.1s After patch 3m02.3s 5m00.2s 1m43.7s 3m03.5s For the overcommited case (48 vCPUs), this patch is able to reduce kernel build time by more than 54% for Westmere and 44% for Haswell. Signed-off-by: Waiman Long <Waiman.Long@hpe.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Davidlohr Bueso <dave@stgolabs.net> Cc: Douglas Hatch <doug.hatch@hpe.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Scott J Norton <scott.norton@hpe.com> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1447190336-53317-1-git-send-email-Waiman.Long@hpe.com Signed-off-by: Ingo Molnar <mingo@kernel.org>	2015-12-04 11:39:51 +01:00
Peter Zijlstra	b3e0b1b6d8	locking, sched: Introduce smp_cond_acquire() and use it ... Introduce smp_cond_acquire() which combines a control dependency and a read barrier to form acquire semantics. This primitive has two benefits: - it documents control dependencies, - its typically cheaper than using smp_load_acquire() in a loop. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@kernel.org>	2015-12-04 10:33:41 +01:00
Waiman Long	aa68744f80	locking/qspinlock: Avoid redundant read of next pointer ... With optimistic prefetch of the next node cacheline, the next pointer may have been properly inititalized. As a result, the reading of node->next in the contended path may be redundant. This patch eliminates the redundant read if the next pointer value is not NULL. Signed-off-by: Waiman Long <Waiman.Long@hpe.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Davidlohr Bueso <dave@stgolabs.net> Cc: Douglas Hatch <doug.hatch@hpe.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Scott J Norton <scott.norton@hpe.com> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1447114167-47185-4-git-send-email-Waiman.Long@hpe.com Signed-off-by: Ingo Molnar <mingo@kernel.org>	2015-11-23 10:02:00 +01:00
Waiman Long	81b5598665	locking/qspinlock: Prefetch the next node cacheline ... A queue head CPU, after acquiring the lock, will have to notify the next CPU in the wait queue that it has became the new queue head. This involves loading a new cacheline from the MCS node of the next CPU. That operation can be expensive and add to the latency of locking operation. This patch addes code to optmistically prefetch the next MCS node cacheline if the next pointer is defined and it has been spinning for the MCS lock for a while. This reduces the locking latency and improves the system throughput. The performance change will depend on whether the prefetch overhead can be hidden within the latency of the lock spin loop. On really short critical section, there may not be performance gain at all. With longer critical section, however, it was found to have a performance boost of 5-10% over a range of different queue depths with a spinlock loop microbenchmark. Signed-off-by: Waiman Long <Waiman.Long@hpe.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Davidlohr Bueso <dave@stgolabs.net> Cc: Douglas Hatch <doug.hatch@hpe.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Scott J Norton <scott.norton@hpe.com> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1447114167-47185-3-git-send-email-Waiman.Long@hpe.com Signed-off-by: Ingo Molnar <mingo@kernel.org>	2015-11-23 10:01:59 +01:00
Waiman Long	64d816cba0	locking/qspinlock: Use _acquire/_release() versions of cmpxchg() & xchg() ... This patch replaces the cmpxchg() and xchg() calls in the native qspinlock code with the more relaxed _acquire or _release versions of those calls to enable other architectures to adopt queued spinlocks with less memory barrier performance overhead. Signed-off-by: Waiman Long <Waiman.Long@hpe.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Davidlohr Bueso <dave@stgolabs.net> Cc: Douglas Hatch <doug.hatch@hpe.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Scott J Norton <scott.norton@hpe.com> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1447114167-47185-2-git-send-email-Waiman.Long@hpe.com Signed-off-by: Ingo Molnar <mingo@kernel.org>	2015-11-23 10:01:58 +01:00
Peter Zijlstra	43b3f02899	locking/qspinlock/x86: Fix performance regression under unaccelerated VMs ... Dave ran into horrible performance on a VM without PARAVIRT_SPINLOCKS set and Linus noted that the test-and-set implementation was retarded. One should spin on the variable with a load, not a RMW. While there, remove 'queued' from the name, as the lock isn't queued at all, but a simple test-and-set. Suggested-by: Linus Torvalds <torvalds@linux-foundation.org> Reported-by: Dave Chinner <david@fromorbit.com> Tested-by: Dave Chinner <david@fromorbit.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Waiman Long <Waiman.Long@hp.com> Cc: stable@vger.kernel.org # v4.2+ Link: http://lkml.kernel.org/r/20150904152523.GR18673@twins.programming.kicks-ass.net Signed-off-by: Ingo Molnar <mingo@kernel.org>	2015-09-11 07:49:42 +02:00
Waiman Long	75d2270280	locking/pvqspinlock: Only kick CPU at unlock time ... For an over-committed guest with more vCPUs than physical CPUs available, it is possible that a vCPU may be kicked twice before getting the lock - once before it becomes queue head and once again before it gets the lock. All these CPU kicking and halting (VMEXIT) can be expensive and slow down system performance. This patch adds a new vCPU state (vcpu_hashed) which enables the code to delay CPU kicking until at unlock time. Once this state is set, the new lock holder will set _Q_SLOW_VAL and fill in the hash table on behalf of the halted queue head vCPU. The original vcpu_halted state will be used by pv_wait_node() only to differentiate other queue nodes from the qeue head. Signed-off-by: Waiman Long <Waiman.Long@hp.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Douglas Hatch <doug.hatch@hp.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Scott J Norton <scott.norton@hp.com> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1436647018-49734-2-git-send-email-Waiman.Long@hp.com Signed-off-by: Ingo Molnar <mingo@kernel.org>	2015-08-03 10:57:11 +02:00
Waiman Long	a23db284fe	locking/pvqspinlock: Implement simple paravirt support for the qspinlock ... Provide a separate (second) version of the spin_lock_slowpath for paravirt along with a special unlock path. The second slowpath is generated by adding a few pv hooks to the normal slowpath, but where those will compile away for the native case, they expand into special wait/wake code for the pv version. The actual MCS queue can use extra storage in the mcs_nodes[] array to keep track of state and therefore uses directed wakeups. The head contender has no such storage directly visible to the unlocker. So the unlocker searches a hash table with open addressing using a simple binary Galois linear feedback shift register. Suggested-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Waiman Long <Waiman.Long@hp.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Daniel J Blueman <daniel@numascale.com> Cc: David Vrabel <david.vrabel@citrix.com> Cc: Douglas Hatch <doug.hatch@hp.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Paolo Bonzini <paolo.bonzini@gmail.com> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com> Cc: Rik van Riel <riel@redhat.com> Cc: Scott J Norton <scott.norton@hp.com> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1429901803-29771-9-git-send-email-Waiman.Long@hp.com Signed-off-by: Ingo Molnar <mingo@kernel.org>	2015-05-08 12:37:05 +02:00
Peter Zijlstra (Intel)	2aa79af642	locking/qspinlock: Revert to test-and-set on hypervisors ... When we detect a hypervisor (!paravirt, see qspinlock paravirt support patches), revert to a simple test-and-set lock to avoid the horrors of queue preemption. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Waiman Long <Waiman.Long@hp.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Daniel J Blueman <daniel@numascale.com> Cc: David Vrabel <david.vrabel@citrix.com> Cc: Douglas Hatch <doug.hatch@hp.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Paolo Bonzini <paolo.bonzini@gmail.com> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com> Cc: Rik van Riel <riel@redhat.com> Cc: Scott J Norton <scott.norton@hp.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: virtualization@lists.linux-foundation.org Cc: xen-devel@lists.xenproject.org Link: http://lkml.kernel.org/r/1429901803-29771-8-git-send-email-Waiman.Long@hp.com Signed-off-by: Ingo Molnar <mingo@kernel.org>	2015-05-08 12:36:58 +02:00
Waiman Long	2c83e8e949	locking/qspinlock: Use a simple write to grab the lock ... Currently, atomic_cmpxchg() is used to get the lock. However, this is not really necessary if there is more than one task in the queue and the queue head don't need to reset the tail code. For that case, a simple write to set the lock bit is enough as the queue head will be the only one eligible to get the lock as long as it checks that both the lock and pending bits are not set. The current pending bit waiting code will ensure that the bit will not be set as soon as the tail code in the lock is set. With that change, the are some slight improvement in the performance of the queued spinlock in the 5M loop micro-benchmark run on a 4-socket Westere-EX machine as shown in the tables below. [Standalone/Embedded - same node] # of tasks Before patch After patch %Change ---------- ----------- ---------- ------- 3 2324/2321 2248/2265 -3%/-2% 4 2890/2896 2819/2831 -2%/-2% 5 3611/3595 3522/3512 -2%/-2% 6 4281/4276 4173/4160 -3%/-3% 7 5018/5001 4875/4861 -3%/-3% 8 5759/5750 5563/5568 -3%/-3% [Standalone/Embedded - different nodes] # of tasks Before patch After patch %Change ---------- ----------- ---------- ------- 3 12242/12237 12087/12093 -1%/-1% 4 10688/10696 10507/10521 -2%/-2% It was also found that this change produced a much bigger performance improvement in the newer IvyBridge-EX chip and was essentially to close the performance gap between the ticket spinlock and queued spinlock. The disk workload of the AIM7 benchmark was run on a 4-socket Westmere-EX machine with both ext4 and xfs RAM disks at 3000 users on a 3.14 based kernel. The results of the test runs were: AIM7 XFS Disk Test kernel JPM Real Time Sys Time Usr Time ----- --- --------- -------- -------- ticketlock 5678233 3.17 96.61 5.81 qspinlock 5750799 3.13 94.83 5.97 AIM7 EXT4 Disk Test kernel JPM Real Time Sys Time Usr Time ----- --- --------- -------- -------- ticketlock 1114551 16.15 509.72 7.11 qspinlock 2184466 8.24 232.99 6.01 The ext4 filesystem run had a much higher spinlock contention than the xfs filesystem run. The "ebizzy -m" test was also run with the following results: kernel records/s Real Time Sys Time Usr Time ----- --------- --------- -------- -------- ticketlock 2075 10.00 216.35 3.49 qspinlock 3023 10.00 198.20 4.80 Signed-off-by: Waiman Long <Waiman.Long@hp.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Daniel J Blueman <daniel@numascale.com> Cc: David Vrabel <david.vrabel@citrix.com> Cc: Douglas Hatch <doug.hatch@hp.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Paolo Bonzini <paolo.bonzini@gmail.com> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com> Cc: Rik van Riel <riel@redhat.com> Cc: Scott J Norton <scott.norton@hp.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: virtualization@lists.linux-foundation.org Cc: xen-devel@lists.xenproject.org Link: http://lkml.kernel.org/r/1429901803-29771-7-git-send-email-Waiman.Long@hp.com Signed-off-by: Ingo Molnar <mingo@kernel.org>	2015-05-08 12:36:55 +02:00
Peter Zijlstra (Intel)	69f9cae909	locking/qspinlock: Optimize for smaller NR_CPUS ... When we allow for a max NR_CPUS < 2^14 we can optimize the pending wait-acquire and the xchg_tail() operations. By growing the pending bit to a byte, we reduce the tail to 16bit. This means we can use xchg16 for the tail part and do away with all the repeated compxchg() operations. This in turn allows us to unconditionally acquire; the locked state as observed by the wait loops cannot change. And because both locked and pending are now a full byte we can use simple stores for the state transition, obviating one atomic operation entirely. This optimization is needed to make the qspinlock achieve performance parity with ticket spinlock at light load. All this is horribly broken on Alpha pre EV56 (and any other arch that cannot do single-copy atomic byte stores). Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Waiman Long <Waiman.Long@hp.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Daniel J Blueman <daniel@numascale.com> Cc: David Vrabel <david.vrabel@citrix.com> Cc: Douglas Hatch <doug.hatch@hp.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Paolo Bonzini <paolo.bonzini@gmail.com> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com> Cc: Rik van Riel <riel@redhat.com> Cc: Scott J Norton <scott.norton@hp.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: virtualization@lists.linux-foundation.org Cc: xen-devel@lists.xenproject.org Link: http://lkml.kernel.org/r/1429901803-29771-6-git-send-email-Waiman.Long@hp.com Signed-off-by: Ingo Molnar <mingo@kernel.org>	2015-05-08 12:36:48 +02:00
Waiman Long	6403bd7d0e	locking/qspinlock: Extract out code snippets for the next patch ... This is a preparatory patch that extracts out the following 2 code snippets to prepare for the next performance optimization patch. 1) the logic for the exchange of new and previous tail code words into a new xchg_tail() function. 2) the logic for clearing the pending bit and setting the locked bit into a new clear_pending_set_locked() function. This patch also simplifies the trylock operation before queuing by calling queued_spin_trylock() directly. Signed-off-by: Waiman Long <Waiman.Long@hp.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Daniel J Blueman <daniel@numascale.com> Cc: David Vrabel <david.vrabel@citrix.com> Cc: Douglas Hatch <doug.hatch@hp.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Paolo Bonzini <paolo.bonzini@gmail.com> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com> Cc: Rik van Riel <riel@redhat.com> Cc: Scott J Norton <scott.norton@hp.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: virtualization@lists.linux-foundation.org Cc: xen-devel@lists.xenproject.org Link: http://lkml.kernel.org/r/1429901803-29771-5-git-send-email-Waiman.Long@hp.com Signed-off-by: Ingo Molnar <mingo@kernel.org>	2015-05-08 12:36:41 +02:00
Peter Zijlstra (Intel)	c1fb159db9	locking/qspinlock: Add pending bit ... Because the qspinlock needs to touch a second cacheline (the per-cpu mcs_nodes[]); add a pending bit and allow a single in-word spinner before we punt to the second cacheline. It is possible so observe the pending bit without the locked bit when the last owner has just released but the pending owner has not yet taken ownership. In this case we would normally queue -- because the pending bit is already taken. However, in this case the pending bit is guaranteed to be released 'soon', therefore wait for it and avoid queueing. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Waiman Long <Waiman.Long@hp.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Daniel J Blueman <daniel@numascale.com> Cc: David Vrabel <david.vrabel@citrix.com> Cc: Douglas Hatch <doug.hatch@hp.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Paolo Bonzini <paolo.bonzini@gmail.com> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com> Cc: Rik van Riel <riel@redhat.com> Cc: Scott J Norton <scott.norton@hp.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: virtualization@lists.linux-foundation.org Cc: xen-devel@lists.xenproject.org Link: http://lkml.kernel.org/r/1429901803-29771-4-git-send-email-Waiman.Long@hp.com Signed-off-by: Ingo Molnar <mingo@kernel.org>	2015-05-08 12:36:32 +02:00
Waiman Long	a33fda35e3	locking/qspinlock: Introduce a simple generic 4-byte queued spinlock ... This patch introduces a new generic queued spinlock implementation that can serve as an alternative to the default ticket spinlock. Compared with the ticket spinlock, this queued spinlock should be almost as fair as the ticket spinlock. It has about the same speed in single-thread and it can be much faster in high contention situations especially when the spinlock is embedded within the data structure to be protected. Only in light to moderate contention where the average queue depth is around 1-3 will this queued spinlock be potentially a bit slower due to the higher slowpath overhead. This queued spinlock is especially suit to NUMA machines with a large number of cores as the chance of spinlock contention is much higher in those machines. The cost of contention is also higher because of slower inter-node memory traffic. Due to the fact that spinlocks are acquired with preemption disabled, the process will not be migrated to another CPU while it is trying to get a spinlock. Ignoring interrupt handling, a CPU can only be contending in one spinlock at any one time. Counting soft IRQ, hard IRQ and NMI, a CPU can only have a maximum of 4 concurrent lock waiting activities. By allocating a set of per-cpu queue nodes and used them to form a waiting queue, we can encode the queue node address into a much smaller 24-bit size (including CPU number and queue node index) leaving one byte for the lock. Please note that the queue node is only needed when waiting for the lock. Once the lock is acquired, the queue node can be released to be used later. Signed-off-by: Waiman Long <Waiman.Long@hp.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com> Cc: Borislav Petkov <bp@alien8.de> Cc: Daniel J Blueman <daniel@numascale.com> Cc: David Vrabel <david.vrabel@citrix.com> Cc: Douglas Hatch <doug.hatch@hp.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Paolo Bonzini <paolo.bonzini@gmail.com> Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com> Cc: Rik van Riel <riel@redhat.com> Cc: Scott J Norton <scott.norton@hp.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: virtualization@lists.linux-foundation.org Cc: xen-devel@lists.xenproject.org Link: http://lkml.kernel.org/r/1429901803-29771-2-git-send-email-Waiman.Long@hp.com Signed-off-by: Ingo Molnar <mingo@kernel.org>	2015-05-08 12:36:25 +02:00