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x86, idle: Add memory barriers around clflush in mwait_play_dead()

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For consistency with mwait_idle_with_hints().  Not sure they help, but
they really won't hurt...

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Len Brown <len.brown@intel.com>
Link: http://lkml.kernel.org/r/CA%2B55aFzGxcML7j8CEvQPYzh0W81uVoAAVmGctMOUZ7CZ1yYd2A@mail.gmail.com
This commit is contained in:
H. Peter Anvin 2013-12-19 12:30:03 -08:00
parent 7e98b71920
commit 7d590cca7c
1 changed files with 2 additions and 0 deletions
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2
arch/x86/kernel/smpboot.c
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@ -1417,7 +1417,9 @@ static inline void mwait_play_dead(void)
* The WBINVD is insufficient due to the spurious-wakeup
* case where we return around the loop.
*/
mb();
clflush(mwait_ptr);
mb();
__monitor(mwait_ptr, 0, 0);
mb();
__mwait(eax, 0);