perf, x86: Fix x86_pmu_start

pmu::start should undo pmu::stop, make it so.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@infradead.org>
Cc: paulus@samba.org
Cc: eranian@google.com
Cc: robert.richter@amd.com
Cc: fweisbec@gmail.com
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 10 insertions, 13 deletions

diff --git a/arch/x86/kernel/cpu/perf_event.c b/arch/x86/kernel/cpu/perf_event.c
index 01b16673742..9757b96f15f 100644
--- a/arch/x86/kernel/cpu/perf_event.c
+++ b/arch/x86/kernel/cpu/perf_event.c
@@ -785,6 +785,7 @@ static inline int match_prev_assignment(struct hw_perf_event *hwc,
                 hwc->last_tag == cpuc->tags[i];
 }
 
+static int x86_pmu_start(struct perf_event *event);
 static void x86_pmu_stop(struct perf_event *event);
 
 void hw_perf_enable(void)
@@ -833,20 +834,10 @@ void hw_perf_enable(void)
                         event = cpuc->event_list[i];
                         hwc = &event->hw;
 
-                        if (hwc->idx == -1) {
+                        if (hwc->idx == -1)
                                 x86_assign_hw_event(event, cpuc, i);
-                                x86_perf_event_set_period(event);
-                        }
-                        /*
-                         * need to mark as active because x86_pmu_disable()
-                         * clear active_mask and events[] yet it preserves
-                         * idx
-                         */
-                        __set_bit(hwc->idx, cpuc->active_mask);
-                        cpuc->events[hwc->idx] = event;
 
-                        x86_pmu.enable(event);
-                        perf_event_update_userpage(event);
+                        x86_pmu_start(event);
                 }
                 cpuc->n_added = 0;
                 perf_events_lapic_init();
@@ -975,11 +966,17 @@ static int x86_pmu_enable(struct perf_event *event)
 
 static int x86_pmu_start(struct perf_event *event)
 {
-        if (event->hw.idx == -1)
+        struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events);
+        int idx = event->hw.idx;
+
+        if (idx == -1)
                 return -EAGAIN;
 
         x86_perf_event_set_period(event);
+        cpuc->events[idx] = event;
+        __set_bit(idx, cpuc->active_mask);
         x86_pmu.enable(event);
+        perf_event_update_userpage(event);
 
         return 0;
 }