Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull perf fixes from Thomas Gleixner:
 "Three fixlets for perf:

   - add a missing NULL pointer check in the intel BTS driver

   - make BTS an exclusive PMU because BTS can only handle one event at
     a time

   - ensure that exclusive events are limited to one PMU so that several
     exclusive events can be scheduled on different PMU instances"

* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  perf/core: Limit matching exclusive events to one PMU
  perf/x86/intel/bts: Make it an exclusive PMU
  perf/x86/intel/bts: Make sure debug store is valid

2 files changed, 4 insertions, 3 deletions

diff --git a/arch/x86/events/intel/bts.c b/arch/x86/events/intel/bts.c
index bdcd6510992c..982c9e31daca 100644
--- a/arch/x86/events/intel/bts.c
+++ b/arch/x86/events/intel/bts.c
@@ -455,7 +455,7 @@ int intel_bts_interrupt(void)
          * The only surefire way of knowing if this NMI is ours is by checking
          * the write ptr against the PMI threshold.
          */
-        if (ds->bts_index >= ds->bts_interrupt_threshold)
+        if (ds && (ds->bts_index >= ds->bts_interrupt_threshold))
                 handled = 1;
 
         /*
@@ -584,7 +584,8 @@ static __init int bts_init(void)
         if (!boot_cpu_has(X86_FEATURE_DTES64) || !x86_pmu.bts)
                 return -ENODEV;
 
-        bts_pmu.capabilities    = PERF_PMU_CAP_AUX_NO_SG | PERF_PMU_CAP_ITRACE;
+        bts_pmu.capabilities    = PERF_PMU_CAP_AUX_NO_SG | PERF_PMU_CAP_ITRACE |
+                                  PERF_PMU_CAP_EXCLUSIVE;
         bts_pmu.task_ctx_nr     = perf_sw_context;
         bts_pmu.event_init      = bts_event_init;
         bts_pmu.add             = bts_event_add;
diff --git a/kernel/events/core.c b/kernel/events/core.c
index a54f2c2cdb20..fc9bb2225291 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -3929,7 +3929,7 @@ static void exclusive_event_destroy(struct perf_event *event)
 
 static bool exclusive_event_match(struct perf_event *e1, struct perf_event *e2)
 {
-        if ((e1->pmu->capabilities & PERF_PMU_CAP_EXCLUSIVE) &&
+        if ((e1->pmu == e2->pmu) &&
             (e1->cpu == e2->cpu ||
              e1->cpu == -1 ||
              e2->cpu == -1))