From: Robert Richter <[email protected]> Check if an event already exists before adding it.
Signed-off-by: Robert Richter <[email protected]> Signed-off-by: Robert Richter <[email protected]> --- kernel/events/persistent.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/kernel/events/persistent.c b/kernel/events/persistent.c index 586cea5..4fcd071 100644 --- a/kernel/events/persistent.c +++ b/kernel/events/persistent.c @@ -40,6 +40,12 @@ add_persistent_event_on_cpu(unsigned int cpu, struct perf_event_attr *attr, mutex_lock(&per_cpu(pers_events_lock, cpu)); + desc = get_persistent_event(cpu, attr); + if (desc) { + event = ERR_PTR(-EEXIST); + goto out; + } + desc = kzalloc(sizeof(*desc), GFP_KERNEL); if (!desc) { event = ERR_PTR(-ENOMEM); -- 1.8.1.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
