Thiago Jung Bauermann 3e401f7a2e powerpc: Only obtain cpu_hotplug_lock if called by rtasd ...

Calling arch_update_cpu_topology from a CPU hotplug state machine callback
hits a deadlock because the function tries to get a read lock on
cpu_hotplug_lock while the state machine still holds a write lock on it.

Since all callers of arch_update_cpu_topology except rtasd already hold
cpu_hotplug_lock, this patch changes the function to use
stop_machine_cpuslocked and creates a separate function for rtasd which
still tries to obtain the lock.

Michael Bringmann investigated the bug and provided a detailed analysis
of the deadlock on this previous RFC for an alternate solution:

Signed-off-by: Thiago Jung Bauermann <bauerman@linux.vnet.ibm.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Michael Ellerman <mpe@ellerman.id.au>
Cc: John Allen <jallen@linux.vnet.ibm.com>
Cc: Michael Bringmann <mwb@linux.vnet.ibm.com>
Cc: Nathan Fontenot <nfont@linux.vnet.ibm.com>
Cc: linuxppc-dev@lists.ozlabs.org
Link: http://lkml.kernel.org/r/1497996510-4032-1-git-send-email-bauerman@linux.vnet.ibm.com
Link: https://patchwork.ozlabs.org/patch/771293/

2017-06-23 09:32:11 +02:00

..

trace

powerpc/ftrace/64: Split further based on -mprofile-kernel

2017-04-27 22:20:29 +10:00

vdso32

powerpc/vdso: Fix build rules to rebuild vdsos correctly

2016-08-10 23:04:12 +10:00

vdso64

powerpc/vdso64: Use double word compare on pointers

2016-09-29 15:17:57 +10:00

.gitignore

…

align.c

powerpc: Don't try to fix up misaligned load-with-reservation instructions

2017-04-04 23:16:57 +10:00

asm-offsets.c

Merge branch 'kvm-ppc-next' of git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc into HEAD

2017-05-09 11:50:01 +02:00

audit.c

…

btext.c

powerpc/mm: Use a helper for finding pte bits mapping I/O area

2016-05-01 18:32:32 +10:00

cacheinfo.c

powerpc: Fix missing L2 cache size in /sys/devices/system/cpu

2015-04-11 20:49:28 +10:00

cacheinfo.h

…

compat_audit.c

…

cpu_setup_6xx.S

powerpc: Various typo fixes

2016-06-14 13:58:26 +10:00

cpu_setup_44x.S

…

cpu_setup_fsl_booke.S

powerpc/cache: add cache flush operation for various e500

2016-03-04 23:44:51 -06:00

cpu_setup_pa6t.S

…

cpu_setup_power.S

powerpc/64s: Power9 has no LPCR[VRMASD] field so don't set it

2017-05-03 20:45:55 +10:00

cpu_setup_ppc970.S

…

cputable.c

powerpc/64s: Support new device tree binding for discovering CPU features

2017-05-09 23:42:55 +10:00

crash_dump.c

Replace <asm/uaccess.h> with <linux/uaccess.h> globally

2016-12-24 11:46:01 -08:00

crash.c

powerpc/fadump: remove dependency with CONFIG_KEXEC

2017-05-08 17:15:11 -07:00

dbell.c

powerpc: Introduce msgsnd/doorbell barrier primitives

2017-04-13 23:34:33 +10:00

dma-iommu.c

dma-mapping: use unsigned long for dma_attrs

2016-08-04 08:50:07 -04:00

dma-swiotlb.c

treewide: Constify most dma_map_ops structures

2017-01-24 12:23:35 -05:00

dma.c

treewide: Move dma_ops from struct dev_archdata into struct device

2017-01-24 12:23:35 -05:00

dt_cpu_ftrs.c

powerpc/64s: Support new device tree binding for discovering CPU features

2017-05-09 23:42:55 +10:00

eeh_cache.c

powerpc/eeh: Fix pr_debug()s in eeh_cache.c

2016-07-08 22:09:50 +10:00

eeh_dev.c

powerpc/pci: Delay populating pdn

2016-06-21 15:30:56 +10:00

eeh_driver.c

powerpc/eeh: Clean up and document event handling functions

2017-05-02 22:41:43 +10:00

eeh_event.c

powerpc/pci: Always print PHB and PE numbers as hexadecimal

2016-11-22 11:57:07 +11:00

eeh_pe.c

powerpc/pci: Always print PHB and PE numbers as hexadecimal

2016-11-22 11:57:07 +11:00

eeh_sysfs.c

powerpc/eeh: Fix PE state format

2014-11-27 09:32:58 +11:00

eeh.c

powerpc: Create asm/debugfs.h and move powerpc_debugfs_root there

2017-04-11 07:46:03 +10:00

entry_32.S

powerpc: Split ftrace bits into a separate file

2017-04-27 22:20:29 +10:00

entry_64.S

Merge tag 'powerpc-4.12-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux

2017-05-05 11:36:44 -07:00

epapr_hcalls.S

ppc: move exports to definitions

2016-08-07 23:50:09 -04:00

epapr_paravirt.c

Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc

2014-06-10 18:54:22 -07:00

exceptions-64e.S

powerpc/64e: Fix hang when debugging programs with relocated kernel

2017-04-30 01:05:18 -05:00

exceptions-64s.S

Merge tag 'powerpc-4.12-2' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux

2017-05-12 10:04:09 -07:00

fadump.c

powerpc/fadump: reuse crashkernel parameter for fadump memory reservation

2017-05-08 17:15:11 -07:00

firmware.c

…

fpu.S

Merge branch 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild

2016-10-14 14:26:58 -07:00

fsl_booke_entry_mapping.S

powerpc/fsl: Force coherent memory on e500mc derivatives

2015-08-07 23:00:01 -05:00

head_8xx.S

powerpc/8xx: Perf events on PPC 8xx

2017-01-26 17:49:34 -06:00

head_32.S

powerpc/32: Remove Mac-on-Linux/rtlinux hooks

2017-03-21 22:09:26 +11:00

head_40x.S

ppc: move exports to definitions

2016-08-07 23:50:09 -04:00

head_44x.S

ppc: move exports to definitions

2016-08-07 23:50:09 -04:00

head_64.S

powerpc/64: Allow for THREAD_SIZE > 16k

2017-03-20 19:02:49 +11:00

head_booke.h

…

head_fsl_booke.S

ppc: move exports to definitions

2016-08-07 23:50:09 -04:00

hw_breakpoint.c

Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/scottwood/linux into next

2017-02-18 21:37:14 +11:00

idle_6xx.S

…

idle_book3e.S

…

idle_book3s.S

powerpc/powernv: Set NAPSTATELOST after recovering paca on P9 DD1

2017-05-16 13:03:21 +10:00

idle_e500.S

powerpc/e500mc: Remove dead L2 flushing code in idle_e500.S

2015-06-02 21:37:19 -05:00

idle_power4.S

…

idle.c

…

ima_kexec.c

powerpc: ima: send the kexec buffer to the next kernel

2016-12-20 09:48:44 -08:00

io-workarounds.c

sched/headers: Prepare to remove the <linux/mm_types.h> dependency from <linux/sched.h>

2017-03-02 08:42:37 +01:00

io.c

…

iomap.c

powerpc: Move isa bridge definitions to separate include

2017-01-31 13:54:17 +11:00

iommu.c

KVM: PPC: iommu: Unify TCE checking

2017-04-20 11:39:21 +10:00

irq.c

Merge branch 'topic/xive' (early part) into next

2017-04-12 22:31:37 +10:00

isa-bridge.c

powerpc: Add support for non-PCI ISA bridges

2017-01-31 13:54:17 +11:00

jump_label.c

jump_label: Rename JUMP_LABEL_{EN,DIS}ABLE to JUMP_LABEL_{JMP,NOP}

2015-08-03 11:34:12 +02:00

kexec_elf_64.c

powerpc: ima: send the kexec buffer to the next kernel

2016-12-20 09:48:44 -08:00

kgdb.c

powerpc: Fix kgdb on little endian ppc64le

2016-02-18 00:03:26 +11:00

kprobes-ftrace.c

powerpc/kprobes: Add support for KPROBES_ON_FTRACE

2017-04-24 19:07:58 +10:00

kprobes.c

powerpc/kprobes: Fix handling of instruction emulation on probe re-entry

2017-05-16 13:11:07 +10:00

kvm_emul.S

…

kvm.c

powerpc: Remove redundant breaks

2015-08-06 15:10:20 +10:00

l2cr_6xx.S

…

legacy_serial.c

powerpc/powernv: Add support for direct mapped LPC on POWER9

2017-01-31 13:54:18 +11:00

machine_kexec_32.c

…

machine_kexec_64.c

powerpc: Add purgatory for kexec_file_load() implementation.

2016-11-30 23:15:26 +11:00

machine_kexec_file_64.c

powerpc: ima: send the kexec buffer to the next kernel

2016-12-20 09:48:44 -08:00

machine_kexec.c

powerpc: Update of_remove_property() call sites to remove null checking

2016-05-11 21:54:04 +10:00

Makefile

powerpc/64s: Support new device tree binding for discovering CPU features

2017-05-09 23:42:55 +10:00

mce_power.c

powerpc/64s: Minor fix for MCE TLB flush for radix

2017-04-19 20:00:18 +10:00

mce.c

powerpc/book3s/mce: Move add_taint() later in virtual mode

2017-05-03 14:45:39 +10:00

misc_32.S

powerpc: Fix build warning on 32-bit PPC

2016-12-25 16:12:20 -08:00

misc_64.S

powerpc/64: Fix flush_(d|i)cache_range() called from modules

2017-04-05 21:40:21 +10:00

misc.S

ppc: move exports to definitions

2016-08-07 23:50:09 -04:00

module_32.c

powerpc/module: Only try to generate the ftrace_caller() stub once

2016-03-07 14:53:53 +11:00

module_64.c

modversions: treat symbol CRCs as 32 bit quantities

2017-02-03 08:28:25 -08:00

module.c

Replace <asm/uaccess.h> with <linux/uaccess.h> globally

2016-12-24 11:46:01 -08:00

msi.c

powerpc: Remove MSI-related PCI controller ops from ppc_md

2015-06-02 11:47:45 +10:00

nvram_64.c

pstore: Fix flags to enable dumps on powerpc

2017-04-27 14:49:05 -07:00

of_platform.c

powerpc/of_platform: Use builtin_platform_driver

2016-11-25 14:07:51 +11:00

optprobes_head.S

powerpc/optprobes: Fix TOC handling in optprobes trampoline

2017-02-23 08:23:30 +11:00

optprobes.c

powerpc: Introduce a new helper to obtain function entry points

2017-04-24 19:07:58 +10:00

paca.c

powerpc/mm/hash: Store addr_limit in PACA

2017-04-01 21:12:27 +11:00

pci_32.c

Replace <asm/uaccess.h> with <linux/uaccess.h> globally

2016-12-24 11:46:01 -08:00

pci_64.c

Merge tag 'powerpc-4.7-5' into next

2016-07-15 14:57:47 +10:00

pci_dn.c

powerpc/pci: Fix build with PCI_IOV=y and EEH=n

2016-07-07 16:33:27 +10:00

pci_of_scan.c

powerpc: Remove all usages of NO_IRQ

2016-09-20 20:57:12 +10:00

pci-common.c

Merge branch 'pci/resource-mmap' into next

2017-04-28 10:34:34 -05:00

pci-hotplug.c

powerpc/pci: Don't scan empty slot

2016-05-11 21:54:26 +10:00

pmc.c

…

ppc32.h

…

ppc_save_regs.S

…

proc_powerpc.c

Replace <asm/uaccess.h> with <linux/uaccess.h> globally

2016-12-24 11:46:01 -08:00

process.c

powerpc/tm: Fix FP and VMX register corruption

2017-05-15 19:31:38 +10:00

prom_init_check.sh

powerpc: Simplify symbol check in prom_init_check.sh

2014-09-25 23:14:46 +10:00

prom_init.c

powerpc/prom: Increase minimum RMA size to 512MB

2017-04-04 13:27:59 +10:00

prom_parse.c

…

prom.c

powerpc/64s: Support new device tree binding for discovering CPU features

2017-05-09 23:42:55 +10:00

ptrace32.c

Replace <asm/uaccess.h> with <linux/uaccess.h> globally

2016-12-24 11:46:01 -08:00

ptrace.c

powerpc/ptrace: Preserve previous TM fprs/vsrs on short regset write

2017-01-20 14:55:19 +11:00

reloc_32.S

…

reloc_64.S

…

rtas_flash.c

Replace <asm/uaccess.h> with <linux/uaccess.h> globally

2016-12-24 11:46:01 -08:00

rtas_pci.c

powerpc: move find_and_init_phbs() to pSeries specific code

2015-04-11 20:49:09 +10:00

rtas-proc.c

Replace <asm/uaccess.h> with <linux/uaccess.h> globally

2016-12-24 11:46:01 -08:00

rtas-rtc.c

…

rtas.c

powerpc/kernel: Fix unbalanced refcount on RTAS device node

2017-01-25 13:34:21 +11:00

rtasd.c

powerpc: Only obtain cpu_hotplug_lock if called by rtasd

2017-06-23 09:32:11 +02:00

setup_32.c

powerpc: Move {d,i,u}cache_bsize definitions to a common place

2017-02-06 19:46:04 +11:00

setup_64.c

Merge tag 'powerpc-4.12-2' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux

2017-05-12 10:04:09 -07:00

setup-common.c

Merge tag 'powerpc-4.12-2' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux

2017-05-12 10:04:09 -07:00

setup.h

powerpc: Merge 32-bit and 64-bit setup_arch()

2016-07-21 19:17:46 +10:00

signal_32.c

Replace <asm/uaccess.h> with <linux/uaccess.h> globally

2016-12-24 11:46:01 -08:00

signal_64.c

Replace <asm/uaccess.h> with <linux/uaccess.h> globally

2016-12-24 11:46:01 -08:00

signal.c

livepatch/powerpc: add TIF_PATCH_PENDING thread flag

2017-03-08 09:20:19 +01:00

signal.h

powerpc: tm: Rename transct_(*) to ck(\1)_state

2016-10-04 20:33:16 +11:00

smp-tbsync.c

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smp.c

Merge tag 'powerpc-4.12-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux

2017-05-05 11:36:44 -07:00

stacktrace.c

powerpc: Make /proc/self/stack always print the current stack

2017-03-28 14:43:59 +11:00

suspend.c

nosave: consolidate __nosave_{begin,end} in <asm/sections.h>

2014-10-09 22:26:04 -04:00

swsusp_32.S

…

swsusp_64.c

sched/headers: Prepare for new header dependencies before moving code to <linux/sched/nmi.h>

2017-03-02 08:42:30 +01:00

swsusp_asm64.S

…

swsusp_booke.S

…

swsusp.c

powerpc/swsusp: Include suspend.h to silence sparse warnings

2017-03-20 19:02:49 +11:00

sys_ppc32.c

Replace <asm/uaccess.h> with <linux/uaccess.h> globally

2016-12-24 11:46:01 -08:00

syscalls.c

powerpc/tracing: Allow tracing of mmap syscalls

2017-04-12 22:32:43 +10:00

sysfs.c

powerpc/sysfs: Move #ifdef CONFIG_HOTPLUG_CPU out of the function body

2017-05-03 14:45:38 +10:00

systbl_chk.c

powerpc: Standardise on NR_syscalls rather than __NR_syscalls.

2015-11-26 22:11:17 +11:00

systbl_chk.sh

powerpc: Standardise on NR_syscalls rather than __NR_syscalls.

2015-11-26 22:11:17 +11:00

systbl.S

powerpc: Add a proper syscall for switching endianness

2015-03-28 22:03:40 +11:00

tau_6xx.c

…

time.c

powerpc/time: Set ->min_delta_ticks and ->max_delta_ticks

2017-04-14 13:11:10 -07:00

tm.S

powerpc: tm: Rename transct_(*) to ck(\1)_state

2016-10-04 20:33:16 +11:00

traps.c

powerpc/book3s/mce: Move add_taint() later in virtual mode

2017-05-03 14:45:39 +10:00

udbg_16550.c

powerpc: Fix bad NULL pointer check in udbg_uart_getc_poll()

2014-11-12 13:47:20 +11:00

udbg.c

powerpc: Remove the celleb support

2015-04-07 17:15:13 +10:00

uprobes.c

…

vdso.c

powerpc/64: Clean up ppc64_caches using a struct per cache

2017-02-06 19:46:04 +11:00

vecemu.c

Replace <asm/uaccess.h> with <linux/uaccess.h> globally

2016-12-24 11:46:01 -08:00

vector.S

Merge branch 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild

2016-10-14 14:26:58 -07:00

vmlinux.lds.S

Merge tag 'powerpc-4.12-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux

2017-05-05 11:36:44 -07:00