diff options
| author | Siddha, Suresh B <suresh.b.siddha@intel.com> | 2006-04-11 06:54:42 -0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-04-11 09:38:57 -0400 |
| commit | e4cff6ac78e9c3bbb90c0e01b20418eeae0c6b52 (patch) | |
| tree | 8238a3c16227089250de19a6ab0fc0a8ec939b36 /include | |
| parent | 97a4d00388db4f0bfa37425b31d7d9751ea649db (diff) | |
[PATCH] x86_64: fix sync before RDTSC on Intel cpus
Commit c818a18146997d1356a4840b0c01f1168c16c8a4 didn't do the expected
thing. This fix will remove the additional sync(cpuid) before RDTSC on
Intel platforms..
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/asm-x86_64/timex.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/asm-x86_64/timex.h b/include/asm-x86_64/timex.h index f18443fcdf04..b9e5320b7625 100644 --- a/include/asm-x86_64/timex.h +++ b/include/asm-x86_64/timex.h | |||
| @@ -33,7 +33,7 @@ static __always_inline cycles_t get_cycles_sync(void) | |||
| 33 | unsigned eax; | 33 | unsigned eax; |
| 34 | /* Don't do an additional sync on CPUs where we know | 34 | /* Don't do an additional sync on CPUs where we know |
| 35 | RDTSC is already synchronous. */ | 35 | RDTSC is already synchronous. */ |
| 36 | alternative_io(ASM_NOP2, "cpuid", X86_FEATURE_SYNC_RDTSC, | 36 | alternative_io("cpuid", ASM_NOP2, X86_FEATURE_SYNC_RDTSC, |
| 37 | "=a" (eax), "0" (1) : "ebx","ecx","edx","memory"); | 37 | "=a" (eax), "0" (1) : "ebx","ecx","edx","memory"); |
| 38 | rdtscll(ret); | 38 | rdtscll(ret); |
| 39 | return ret; | 39 | return ret; |