Currently, if the system is in the RCU_SCHEDULER_INACTIVE state, invoke synchronize_rcu_*() will implies a grace period and return directly, so there is no sleep action due to waiting for a grace period to end, but this might_sleep() check is the opposite. therefore, this commit puts might_sleep() check in the correct palce. Signed-off-by: Zqiang <qiang1.zhang@xxxxxxxxx> --- kernel/rcu/tree.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index ee8a6a711719..65f3dd2fd3ae 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -3379,9 +3379,10 @@ void __init kfree_rcu_scheduler_running(void) */ static int rcu_blocking_is_gp(void) { - if (rcu_scheduler_active != RCU_SCHEDULER_INACTIVE) + if (rcu_scheduler_active != RCU_SCHEDULER_INACTIVE) { + might_sleep(); return false; - might_sleep(); /* Check for RCU read-side critical section. */ + } return true; } -- 2.25.1