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f4cb1cc18f
linux/arch/x86
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Fenghua Yu f4cb1cc18f x86-64, copy_user: Remove zero byte check before copy user buffer. 
Operation of rep movsb instruction handles zero byte copy. As pointed out by
Linus, there is no need to check zero size in kernel. Removing this redundant
check saves a few cycles in copy user functions.

Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Link: http://lkml.kernel.org/r/1384634221-6006-1-git-send-email-fenghua.yu@intel.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
2013-11-16 18:00:58 -08:00
..
boot Merge branch 'x86-efi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2013-11-12 10:48:30 +09:00
configs x86, defconfig: Add DEVTMPFS and DEVTMPFS_MOUNT to *86*_defconfig 2013-11-04 20:01:55 -08:00
crypto Reinstate "crypto: crct10dif - Wrap crc_t10dif function all to use crypto transform framework" 2013-09-07 12:56:26 +10:00
ia32 constify copy_siginfo_to_user{,32}() 2013-11-09 00:16:29 -05:00
include Here are the 3.13 KVM changes. There was a lot of work on the PPC 2013-11-15 13:51:36 +09:00
kernel This batch of changes is mostly clean ups and small bug fixes. 2013-11-16 12:23:18 -08:00
kvm kvm, vmx: Fix lazy FPU on nested guest 2013-11-13 18:46:54 +01:00
lguest lguest: fix GPF in guest when using gdb. 2013-09-06 08:09:28 +09:30
lib x86-64, copy_user: Remove zero byte check before copy user buffer. 2013-11-16 18:00:58 -08:00
math-emu
mm x86: handle pgtable_page_ctor() fail 2013-11-15 09:32:19 +09:00
net net: x86: bpf: don't forget to free sk_filter (v2) 2013-11-07 19:06:52 -05:00
oprofile perf: Fix arch_perf_out_copy_user default 2013-11-06 12:34:25 +01:00
pci PCI changes for the v3.13 merge window: 2013-11-14 14:02:00 +09:00
platform Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2013-11-14 16:55:56 +09:00
power x86, asmlinkage, power: Make various symbols used by the suspend asm code visible 2013-08-06 14:21:03 -07:00
realmode x86, relocs: Refactor the relocs tool to merge 32- and 64-bit ELF 2013-04-16 16:02:58 -07:00
syscalls unify compat fanotify_mark(2), switch to COMPAT_SYSCALL_DEFINE 2013-05-09 13:46:38 -04:00
tools Merge branch 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2013-09-04 08:39:38 -07:00
um switch elf_core_write_extra_data() to dump_emit() 2013-11-09 00:16:23 -05:00
vdso seqcount: Add lockdep functionality to seqcount/seqlock structures 2013-11-06 12:40:26 +01:00
video
xen Features: 2013-11-15 13:34:37 +09:00
.gitignore
Kbuild
Kconfig Kconfig cleanups for v3.13 2013-11-15 14:05:15 -08:00
Kconfig.cpu
Kconfig.debug x86/efi: Add EFI framebuffer earlyprintk support 2013-10-28 18:09:58 +00:00
Makefile x86, relocs: Move ELF relocation handling to C 2013-08-07 21:00:04 -07:00
Makefile_32.cpu
Makefile.um