[PATCH 09/15] perf: optimize __perf_event_read()

[Peter Zijlstra]

Both callers actually have IRQs disabled, no need doing so again.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
---
 kernel/perf_event.c |    3 ---
 1 file changed, 3 deletions(-)

Index: linux-2.6/kernel/perf_event.c
===================================================================
--- linux-2.6.orig/kernel/perf_event.c
+++ linux-2.6/kernel/perf_event.c
@@ -1517,7 +1517,6 @@ static void __perf_event_read(void *info
 	struct perf_cpu_context *cpuctx = &__get_cpu_var(perf_cpu_context);
 	struct perf_event *event = info;
 	struct perf_event_context *ctx = event->ctx;
-	unsigned long flags;
 
 	/*
 	 * If this is a task context, we need to check whether it is
@@ -1529,12 +1528,10 @@ static void __perf_event_read(void *info
 	if (ctx->task && cpuctx->task_ctx != ctx)
 		return;
 
-	local_irq_save(flags);
 	if (ctx->is_active)
 		update_context_time(ctx);
 	event->pmu->read(event);
 	update_event_times(event);
-	local_irq_restore(flags);
 }
 
 static u64 perf_event_read(struct perf_event *event)

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