Andy Lutomirski c68ca6787b x86/entry: Micro-optimize compat fast syscall arg fetch ...

We're following a 32-bit pointer, and the uaccess code isn't
smart enough to figure out that the access_ok() check isn't
needed.

This saves about three cycles on a cache-hot fast syscall.

Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Link: http://lkml.kernel.org/r/bdff034e2f23c5eb974c760cf494cb5bddce8f29.1444091585.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>

2015-10-09 09:41:12 +02:00

..

boot

lib/decompressors: use real out buf size for gunzip with kernel

2015-09-10 13:29:01 -07:00

configs

Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux

2015-09-04 15:49:32 -07:00

crypto

crypto: ghash-clmulni: specify context size for ghash async algorithm

2015-09-04 23:21:07 +08:00

entry

x86/entry: Micro-optimize compat fast syscall arg fetch

2015-10-09 09:41:12 +02:00

ia32

x86/vdso: Remove runtime 32-bit vDSO selection

2015-10-07 11:34:08 +02:00

include

x86/asm: Remove thread_info.sysenter_return

2015-10-09 09:41:11 +02:00

kernel

x86/asm: Remove thread_info.sysenter_return

2015-10-09 09:41:11 +02:00

kvm

Use WARN_ON_ONCE for missing X86_FEATURE_NRIPS

2015-10-01 14:59:37 +02:00

lguest

genirq: Remove irq argument from irq flow handlers

2015-09-16 15:47:51 +02:00

lib

x86/asm/delay: Introduce an MWAITX-based delay with a configurable timer

2015-08-22 14:52:16 +02:00

math-emu

Merge branch 'x86/urgent' into x86/asm to fix up conflicts and to pick up fixes

2015-08-18 09:39:47 +02:00

mm

x86/mm: Set NX on gap between __ex_table and rodata

2015-10-02 09:21:06 +02:00

net

bpf: Make the bpf_prog_array_map more generic

2015-08-09 22:50:05 -07:00

oprofile

x86/asm/entry: Change all 'user_mode_vm()' calls to 'user_mode()'

2015-03-23 11:14:17 +01:00

pci

PCI: Revert "PCI: Call pci_read_bridge_bases() from core instead of arch code"

2015-09-15 13:18:04 -05:00

platform

x86/efi: Fix boot crash by mapping EFI memmap entries bottom-up at runtime, instead of top-down

2015-10-01 12:51:28 +02:00

power

x86/ldt: Make modify_ldt synchronous

2015-07-31 10:23:23 +02:00

purgatory

Merge branches 'x86-build-for-linus', 'x86-cleanups-for-linus' and 'x86-debug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2014-12-10 12:35:46 -08:00

ras

x86/ras: Move AMD MCE injector to arch/x86/ras/

2015-08-13 10:12:54 +02:00

realmode

Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2015-02-16 14:58:12 -08:00

tools

x86, build: replace Perl script with Shell script

2015-01-26 13:37:18 -08:00

um

x86/syscalls: Give sys_call_ptr_t a useful type

2015-10-09 09:41:08 +02:00

video

…

xen

x86/vdso: Remove runtime 32-bit vDSO selection

2015-10-07 11:34:08 +02:00

.gitignore

x86/build: Add arch/x86/purgatory/ make generated files to gitignore

2014-10-09 09:29:46 +02:00

Kbuild

x86/asm/entry, x86/vdso: Move the vDSO code to arch/x86/entry/vdso/

2015-06-03 18:51:37 +02:00

Kconfig

x86/entry/vsyscall: Add CONFIG to control default

2015-09-20 10:31:06 +02:00

Kconfig.cpu

…

Kconfig.debug

x86/entry/64, x86/nmi/64: Add CONFIG_DEBUG_ENTRY NMI testing code

2015-07-17 12:50:14 +02:00

Makefile

x86/asm: Re-add parts of the manual CFI infrastructure

2015-10-09 09:41:05 +02:00

Makefile_32.cpu

…

Makefile.um

kbuild: use relative path more to include Makefile

2015-04-02 16:42:08 +02:00