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authorLinus Torvalds <torvalds@linux-foundation.org>2014-07-16 10:10:27 -1000
committerLinus Torvalds <torvalds@linux-foundation.org>2014-07-16 10:10:27 -1000
commitd14aef3872bd25af5355a10ad5235556ac83fcfd (patch)
treefad09e5947a90c8613deca5ced460406cf7f24ee /arch
parent2da2944740931f2b3ef49fd88824959951f5693e (diff)
parent1f9a7268c67f0290837aada443d28fd953ddca90 (diff)
Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull perf fixes from Ingo Molnar: "Tooling fixes and an Intel PMU driver fixlet" * 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: perf: Do not allow optimized switch for non-cloned events perf/x86/intel: ignore CondChgd bit to avoid false NMI handling perf symbols: Get kernel start address by symbol name perf tools: Fix segfault in cumulative.callchain report
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/kernel/cpu/perf_event_intel.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/perf_event_intel.c b/arch/x86/kernel/cpu/perf_event_intel.c
index adb02aa62af5..07846d738bdb 100644
--- a/arch/x86/kernel/cpu/perf_event_intel.c
+++ b/arch/x86/kernel/cpu/perf_event_intel.c
@@ -1382,6 +1382,15 @@ again:
intel_pmu_lbr_read();
/*
+ * CondChgd bit 63 doesn't mean any overflow status. Ignore
+ * and clear the bit.
+ */
+ if (__test_and_clear_bit(63, (unsigned long *)&status)) {
+ if (!status)
+ goto done;
+ }
+
+ /*
* PEBS overflow sets bit 62 in the global status register
*/
if (__test_and_clear_bit(62, (unsigned long *)&status)) {