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authorStephane Eranian <eranian@google.com>2013-03-15 14:26:07 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2013-03-15 09:26:35 -0700
commit1d9d8639c063caf6efc2447f5f26aa637f844ff6 (patch)
treeab9c24ccfd8b464211b393ac8ae9cd6b964e9df3 /arch/Kconfig
parenta2362d24764a4e9a3187fc46b14e1d2cd0657700 (diff)
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perf,x86: fix kernel crash with PEBS/BTS after suspend/resume
This patch fixes a kernel crash when using precise sampling (PEBS) after a suspend/resume. Turns out the CPU notifier code is not invoked on CPU0 (BP). Therefore, the DS_AREA (used by PEBS) is not restored properly by the kernel and keeps it power-on/resume value of 0 causing any PEBS measurement to crash when running on CPU0. The workaround is to add a hook in the actual resume code to restore the DS Area MSR value. It is invoked for all CPUS. So for all but CPU0, the DS_AREA will be restored twice but this is harmless. Reported-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Stephane Eranian <eranian@google.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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