There are two call-sites where using static_key results in recursing on the cpu_hotplug_lock. Signed-off-by: Peter Zijlstra (Intel) --- kernel/events/core.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -7785,7 +7785,7 @@ static int perf_swevent_init(struct perf if (err) return err; - static_key_slow_inc(&perf_swevent_enabled[event_id]); + static_key_slow_inc_nohp(&perf_swevent_enabled[event_id]); event->destroy = sw_perf_event_destroy; } @@ -9294,7 +9294,7 @@ static void account_event(struct perf_ev mutex_lock(&perf_sched_mutex); if (!atomic_read(&perf_sched_count)) { - static_branch_enable(&perf_sched_events); + static_key_slow_inc_nohp(&perf_sched_events.key); /* * Guarantee that all CPUs observe they key change and * call the perf scheduling hooks before proceeding to