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-rw-r--r--kernel/events/core.c26
1 files changed, 14 insertions, 12 deletions
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 6b41c18..38b68a0 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -4474,7 +4474,7 @@ static void perf_event_task_ctx(struct perf_event_context *ctx,
static void perf_event_task_event(struct perf_task_event *task_event)
{
struct perf_cpu_context *cpuctx;
- struct perf_event_context *ctx;
+ struct perf_event_context *ctx, *task_ctx = task_event->task_ctx;
struct pmu *pmu;
int ctxn;
@@ -4485,20 +4485,22 @@ static void perf_event_task_event(struct perf_task_event *task_event)
goto next;
perf_event_task_ctx(&cpuctx->ctx, task_event);
- ctx = task_event->task_ctx;
- if (!ctx) {
- ctxn = pmu->task_ctx_nr;
- if (ctxn < 0)
- goto next;
- ctx = rcu_dereference(current->perf_event_ctxp[ctxn]);
- if (ctx)
- perf_event_task_ctx(ctx, task_event);
- }
+ if (task_ctx)
+ goto next;
+ ctxn = pmu->task_ctx_nr;
+ if (ctxn < 0)
+ goto next;
+ ctx = rcu_dereference(current->perf_event_ctxp[ctxn]);
+ if (ctx)
+ perf_event_task_ctx(ctx, task_event);
next:
put_cpu_ptr(pmu->pmu_cpu_context);
}
- if (task_event->task_ctx)
- perf_event_task_ctx(task_event->task_ctx, task_event);
+ if (task_ctx) {
+ preempt_disable();
+ perf_event_task_ctx(task_ctx, task_event);
+ preempt_enable();
+ }
rcu_read_unlock();
}
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