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Diffstat (limited to 'drivers/oprofile/timer_int.c')
-rw-r--r--drivers/oprofile/timer_int.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/oprofile/timer_int.c b/drivers/oprofile/timer_int.c
index dc0ae4d14dff..010725117dbb 100644
--- a/drivers/oprofile/timer_int.c
+++ b/drivers/oprofile/timer_int.c
@@ -21,6 +21,7 @@
#include "oprof.h"
static DEFINE_PER_CPU(struct hrtimer, oprofile_hrtimer);
+static int ctr_running;
static enum hrtimer_restart oprofile_hrtimer_notify(struct hrtimer *hrtimer)
{
@@ -33,6 +34,9 @@ static void __oprofile_hrtimer_start(void *unused)
{
struct hrtimer *hrtimer = &__get_cpu_var(oprofile_hrtimer);
+ if (!ctr_running)
+ return;
+
hrtimer_init(hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
hrtimer->function = oprofile_hrtimer_notify;
@@ -42,7 +46,10 @@ static void __oprofile_hrtimer_start(void *unused)
static int oprofile_hrtimer_start(void)
{
+ get_online_cpus();
+ ctr_running = 1;
on_each_cpu(__oprofile_hrtimer_start, NULL, 1);
+ put_online_cpus();
return 0;
}
@@ -50,6 +57,9 @@ static void __oprofile_hrtimer_stop(int cpu)
{
struct hrtimer *hrtimer = &per_cpu(oprofile_hrtimer, cpu);
+ if (!ctr_running)
+ return;
+
hrtimer_cancel(hrtimer);
}
@@ -57,8 +67,11 @@ static void oprofile_hrtimer_stop(void)
{
int cpu;
+ get_online_cpus();
for_each_online_cpu(cpu)
__oprofile_hrtimer_stop(cpu);
+ ctr_running = 0;
+ put_online_cpus();
}
static int __cpuinit oprofile_cpu_notify(struct notifier_block *self,

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