x86, idle: Use static_cpu_has() for CLFLUSH workaround, add barriers

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Use static_cpu_has() to conditionalize the CLFLUSH workaround, and add
memory barriers around it since the documentation is explicit that
CLFLUSH is only ordered with respect to MFENCE.

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

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H. Peter Anvin 2013-12-19 11:58:16 -08:00

parent 1682425539

commit 7e98b71920

1 changed files with 4 additions and 1 deletions

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5

arch/x86/include/asm/mwait.h

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