x86, hotplug: In the MWAIT case of play_dead, CLFLUSH the cache line

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When we're using MWAIT for play_dead, explicitly CLFLUSH the cache
line before executing MONITOR.  This is a potential workaround for the
Xeon 7400 erratum AAI65 after having a spurious wakeup and returning
around the loop.  "Potential" here because it is not certain that that
erratum could actually trigger; however, the CLFLUSH should be
harmless.

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Acked-by: Venkatesh Pallipadi <venki@google.com>
Cc: Asit Mallick <asit.k.mallick@intel.com>
Cc: Arjan van de Ven <arjan@linux.kernel.org>
Cc: Len Brown <lenb@kernel.org>

...

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H. Peter Anvin 2010-09-20 13:04:45 -07:00

parent a68e5c94f7

commit ce5f68246b

1 changed files with 19 additions and 1 deletions

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arch/x86/kernel/smpboot.c

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