x86, idle: Use static_cpu_has() for CLFLUSH workaround, add barriers
authorH. Peter Anvin <hpa@linux.intel.com>
Thu, 19 Dec 2013 19:58:16 +0000 (11:58 -0800)
committerH. Peter Anvin <hpa@linux.intel.com>
Thu, 19 Dec 2013 19:58:16 +0000 (11:58 -0800)
commit7e98b71920464b8d15fa95c74366416cd3c88861
treee33e2af9f6a1813490aa686619de72c67b159e81
parent16824255394f55adf31b9a96a9965d8c15bdac4c
x86, idle: Use static_cpu_has() for CLFLUSH workaround, add barriers

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
arch/x86/include/asm/mwait.h