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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
..
.gitignore
x86: Gitignore: arch/x86/lib/inat-tables.c
2009-11-04 13:11:28 +01:00
atomic64_32.c
x86: Adjust asm constraints in atomic64 wrappers
2012-01-20 17:29:31 -08:00
atomic64_386_32.S
x86: atomic64 assembly improvements
2012-01-20 17:29:49 -08:00
atomic64_cx8_32.S
x86: atomic64 assembly improvements
2012-01-20 17:29:49 -08:00
cache-smp.c
x86, lib: Add wbinvd smp helpers
2010-01-22 16:05:42 -08:00
checksum_32.S
x86/lib: Fix spelling, put space between a numeral and its units
2013-04-15 11:40:32 +02:00
clear_page_64.S
x86, mem: clear_page_64.S: Support clear_page() with enhanced REP MOVSB/STOSB
2011-05-17 15:40:27 -07:00
cmpxchg8b_emu.S
x86: Provide an alternative() based cmpxchg64()
2009-09-30 22:55:59 +02:00
cmpxchg16b_emu.S
percpu: Omit segment prefix in the UP case for cmpxchg_double
2011-03-27 19:25:36 -07:00
copy_page_64.S
x86/asm: Clean up copy_page_*() comments and code
2012-10-24 12:42:47 +02:00
copy_user_64.S
x86-64, copy_user: Remove zero byte check before copy user buffer.
2013-11-16 18:00:58 -08:00
copy_user_nocache_64.S
x86, smap: Add STAC and CLAC instructions to control user space access
2012-09-21 12:45:27 -07:00
csum-copy_64.S
x86, extable: Remove open-coded exception table entries in arch/x86/lib/csum-copy_64.S
2012-04-20 13:51:39 -07:00
csum-partial_64.c
x86: Fix common misspellings
2011-03-18 10:39:30 +01:00
csum-wrappers_64.c
x86, smap: Handle csum_partial_copy_*_user()
2013-09-01 14:09:48 -07:00
delay.c
X86: drivers: remove __dev* attributes.
2013-01-03 15:57:04 -08:00
getuser.S
x86: Be consistent with data size in getuser.S
2013-02-11 23:14:48 -08:00
inat.c
x86: Fix to decode grouped AVX with VEX pp bits
2012-02-11 15:11:35 +01:00
insn.c
UAPI: x86: Fix insn_sanity build failure after UAPI split
2012-10-02 18:01:56 +01:00
iomap_copy_64.S
…
Makefile
x86: Improve the printout of the SMP bootup CPU table
2013-09-28 10:10:26 +02:00
memcpy_32.c
x86/lib: Fix spelling, put space between a numeral and its units
2013-04-15 11:40:32 +02:00
memcpy_64.S
x86/lib: Fix spelling, put space between a numeral and its units
2013-04-15 11:40:32 +02:00
memmove_64.S
x86/lib: Fix spelling, put space between a numeral and its units
2013-04-15 11:40:32 +02:00
memset_64.S
x86-64: Fix memset() to support sizes of 4Gb and above
2012-01-26 11:50:04 +01:00
misc.c
x86/boot: Further compress CPUs bootup message
2013-10-01 10:52:30 +02:00
mmx_32.c
x86: clean up mmx_32.c
2008-04-17 17:40:47 +02:00
msr-reg-export.c
x86, pvops: Remove hooks for {rd,wr}msr_safe_regs
2012-06-07 11:41:08 -07:00
msr-reg.S
x86, pvops: Remove hooks for {rd,wr}msr_safe_regs
2012-06-07 11:41:08 -07:00
msr-smp.c
x86 / msr: add 64bit _on_cpu access functions
2013-10-17 00:36:06 +02:00
msr.c
x86, msr: msrs_alloc/free for CONFIG_SMP=n
2009-12-16 15:36:32 -08:00
putuser.S
x86, smap: Add STAC and CLAC instructions to control user space access
2012-09-21 12:45:27 -07:00
rwlock.S
x86: Fix write lock scalability 64-bit issue
2011-07-21 09:03:36 +02:00
rwsem.S
x86: Unify rwsem assembly implementation
2011-07-21 09:03:32 +02:00
string_32.c
x86/i386: Use less assembly in strlen(), speed things up a bit
2011-12-12 18:33:42 +01:00
strstr_32.c
x86: coding style fixes to arch/x86/lib/strstr_32.c
2008-08-15 16:53:24 +02:00
thunk_32.S
x86: Remove unused bits from lib/thunk_*.S
2011-02-28 18:06:22 +01:00
thunk_64.S
x86: Fix write lock scalability 64-bit issue
2011-07-21 09:03:36 +02:00
usercopy_32.c
x86: Unify copy_to_user() and add size checking to it
2013-10-26 12:27:37 +02:00
usercopy_64.c
x86, asmlinkage: Make several variables used from assembler/linker script visible
2013-08-06 14:20:13 -07:00
usercopy.c
perf: Fix arch_perf_out_copy_user default
2013-11-06 12:34:25 +01:00
x86-opcode-map.txt
x86, insn: Add new opcodes as of June, 2013
2013-08-06 08:08:47 -07:00