diff options
| author | Arjan van de Ven <[email protected]> | 2009-09-30 17:07:54 +0200 |
|---|---|---|
| committer | Ingo Molnar <[email protected]> | 2009-09-30 22:55:59 +0200 |
| commit | 79e1dd05d1a22e95ab6d54d21836f478b3b56976 (patch) | |
| tree | 03f9ff44af91de79c33abec468dd278d9cde83d4 /tools/perf/scripts/python/check-perf-trace.py | |
| parent | 17d857be649a21ca90008c6dc425d849fa83db5c (diff) | |
x86: Provide an alternative() based cmpxchg64()
cmpxchg64() today generates, to quote Linus, "barf bag" code.
cmpxchg64() is about to get used in the scheduler to fix a bug there,
but it's a prerequisite that cmpxchg64() first be made non-sucking.
This patch turns cmpxchg64() into an efficient implementation that
uses the alternative() mechanism to just use the raw instruction on
all modern systems.
Note: the fallback is NOT smp safe, just like the current fallback
is not SMP safe. (Interested parties with i486 based SMP systems
are welcome to submit fix patches for that.)
Signed-off-by: Arjan van de Ven <[email protected]>
Acked-by: Linus Torvalds <[email protected]>
[ fixed asm constraint bug ]
Fixed-by: Eric Dumazet <[email protected]>
Cc: Martin Schwidefsky <[email protected]>
Cc: John Stultz <[email protected]>
Cc: Peter Zijlstra <[email protected]>
LKML-Reference: <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
Diffstat (limited to 'tools/perf/scripts/python/check-perf-trace.py')
0 files changed, 0 insertions, 0 deletions