From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Thu, 4 Feb 2016 16:38:10 +0100
Subject: [PATCH] kernel/perf: mark perf_cpu_context's timer as irqsafe

Otherwise we get a WARN_ON() backtrace and some events are reported as
"not counted".

Cc: stable-rt@vger.kernel.org
Reported-by: Yang Shi <yang.shi@linaro.org>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
 kernel/events/core.c |    1 +
 1 file changed, 1 insertion(+)

--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -963,6 +963,7 @@ static void __perf_mux_hrtimer_init(stru
 	raw_spin_lock_init(&cpuctx->hrtimer_lock);
 	hrtimer_init(timer, CLOCK_MONOTONIC, HRTIMER_MODE_ABS_PINNED);
 	timer->function = perf_mux_hrtimer_handler;
+	timer->irqsafe = 1;
 }
 
 static int perf_mux_hrtimer_restart(struct perf_cpu_context *cpuctx)
