| commit | ce5f68246bf2385d6174856708d0b746dc378f20 | |
| author | H. Peter Anvin <hpa@linux.intel.com> | |
| Mon, 20 Sep 2010 20:04:45 +0000 (20 13:04 -0700) | ||
| committer | H. Peter Anvin <hpa@linux.intel.com> | |
| Mon, 20 Sep 2010 22:51:59 +0000 (20 15:51 -0700) | ||
| tree | ba2436cd462a72222a995a6ba887f66232f50843 | treesnapshot (tar.gz zip) |
| parent | a68e5c94f7d3dd64fef34dd5d97e365cae4bb42a | commitdiff |
x86, hotplug: In the MWAIT case of play_dead, CLFLUSH the cache line
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>
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>
| arch/x86/kernel/smpboot.c | diffblobblamehistory |