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authorLinus Torvalds <torvalds@linux-foundation.org>2012-01-06 13:59:14 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2012-01-06 13:59:14 -0800
commit69734b644bf19f20d2989e1a8e5bf59c837ee5c1 (patch)
treeb1afd22d6e84db04516e466c223d67c1c340e6d9 /arch/x86/lib
parent67b0243131150391125d8d0beb5359d7aec78b55 (diff)
parentceb7b40b65539a771d1bfaf47660ac0ee57e0c4f (diff)
Merge branch 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
* 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (21 commits) x86: Fix atomic64_xxx_cx8() functions x86: Fix and improve cmpxchg_double{,_local}() x86_64, asm: Optimise fls(), ffs() and fls64() x86, bitops: Move fls64.h inside __KERNEL__ x86: Fix and improve percpu_cmpxchg{8,16}b_double() x86: Report cpb and eff_freq_ro flags correctly x86/i386: Use less assembly in strlen(), speed things up a bit x86: Use the same node_distance for 32 and 64-bit x86: Fix rflags in FAKE_STACK_FRAME x86: Clean up and extend do_int3() x86: Call do_notify_resume() with interrupts enabled x86/div64: Add a micro-optimization shortcut if base is power of two x86-64: Cleanup some assembly entry points x86-64: Slightly shorten line system call entry and exit paths x86-64: Reduce amount of redundant code generated for invalidate_interruptNN x86-64: Slightly shorten int_ret_from_sys_call x86, efi: Convert efi_phys_get_time() args to physical addresses x86: Default to vsyscall=emulate x86-64: Set siginfo and context on vsyscall emulation faults x86: consolidate xchg and xadd macros ...
Diffstat (limited to 'arch/x86/lib')
-rw-r--r--arch/x86/lib/string_32.c8
1 files changed, 3 insertions, 5 deletions
diff --git a/arch/x86/lib/string_32.c b/arch/x86/lib/string_32.c
index 82004d2bf05..bd59090825d 100644
--- a/arch/x86/lib/string_32.c
+++ b/arch/x86/lib/string_32.c
@@ -164,15 +164,13 @@ EXPORT_SYMBOL(strchr);
size_t strlen(const char *s)
{
int d0;
- int res;
+ size_t res;
asm volatile("repne\n\t"
- "scasb\n\t"
- "notl %0\n\t"
- "decl %0"
+ "scasb"
: "=c" (res), "=&D" (d0)
: "1" (s), "a" (0), "0" (0xffffffffu)
: "memory");
- return res;
+ return ~res - 1;
}
EXPORT_SYMBOL(strlen);
#endif