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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 17:26:35 +0100
commit1d9d8639c063caf6efc2447f5f26aa637f844ff6 (patch)
treeab9c24ccfd8b464211b393ac8ae9cd6b964e9df3 /MAINTAINERS
parentmm/fremap.c: fix possible oops on error path (diff)
downloadlinux-1d9d8639c063caf6efc2447f5f26aa637f844ff6.tar.xz
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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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