As HK_TYPE_TIMER cpumask is going to be changeable at run time, use RCU to protect access to the cpumask.
Signed-off-by: Waiman Long <[email protected]> --- kernel/workqueue.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/kernel/workqueue.c b/kernel/workqueue.c index 08b1c786b463..2dab3872281a 100644 --- a/kernel/workqueue.c +++ b/kernel/workqueue.c @@ -2557,8 +2557,10 @@ static void __queue_delayed_work(int cpu, struct workqueue_struct *wq, if (housekeeping_enabled(HK_TYPE_TIMER)) { /* If the current cpu is a housekeeping cpu, use it. */ cpu = smp_processor_id(); - if (!housekeeping_test_cpu(cpu, HK_TYPE_TIMER)) - cpu = housekeeping_any_cpu(HK_TYPE_TIMER); + scoped_guard(rcu) { + if (!housekeeping_test_cpu(cpu, HK_TYPE_TIMER)) + cpu = housekeeping_any_cpu(HK_TYPE_TIMER); + } add_timer_on(timer, cpu); } else { if (likely(cpu == WORK_CPU_UNBOUND)) -- 2.53.0
