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Merge "perf/core: Fix crash in perf_event_read()"

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Linux Build Service Account 2017-08-03 20:51:14 -07:00 • committed by Gerrit - the friendly Code Review server
commit 11623fddcd
1 changed files with 9 additions and 4 deletions
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13
kernel/events/core.c
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@ -3437,22 +3437,27 @@ u64 perf_event_read_local(struct perf_event *event)
static int perf_event_read(struct perf_event *event, bool group)
{
int ret = 0;
int event_cpu, ret = 0;
/*
* If event is enabled and currently active on a CPU, update the
* value in the event structure:
*/
event_cpu = READ_ONCE(event->oncpu);
if (event->state == PERF_EVENT_STATE_ACTIVE &&
!cpu_isolated(event->oncpu)) {
!cpu_isolated(event_cpu)) {
struct perf_read_data data = {
.event = event,
.group = group,
.ret = 0,
};
if ((unsigned int)event_cpu >= nr_cpu_ids)
return 0;
if (!event->attr.exclude_idle ||
!per_cpu(is_idle, event->oncpu)) {
smp_call_function_single(event->oncpu,
!per_cpu(is_idle, event_cpu)) {
smp_call_function_single(event_cpu,
__perf_event_read, &data, 1);
ret = data.ret;
}