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authorAndi Kleen <ak@linux.intel.com>2015-10-20 11:46:33 -0700
committerIngo Molnar <mingo@kernel.org>2015-11-23 09:44:57 +0100
commitb28ae9560b693bcd2e9f4d6d9c415d5380b7c3c5 (patch)
tree44d175d2ef3b8a3a596d93510f8f31db4d3cd5e6 /lib
parentdaecbd267daad36c1cd90254f502610f82efcb30 (diff)
downloadlinux-b28ae9560b693bcd2e9f4d6d9c415d5380b7c3c5.tar.bz2
perf/x86: Fix LBR call stack save/restore
This fixes a bug I added in the following commit: 90405aa02247 ("perf/x86/intel/lbr: Limit LBR accesses to TOS in callstack mode") The bug could lead to lost LBR call stacks. When restoring the LBR state we need to use the TOS of the previous context, not the current context. To do that we need to save/restore the TOS. Signed-off-by: Andi Kleen <ak@linux.intel.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vince Weaver <vincent.weaver@maine.edu> Cc: acme@kernel.org Cc: jolsa@kernel.org Link: http://lkml.kernel.org/r/1445366797-30894-1-git-send-email-andi@firstfloor.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
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