From 0f58d2ac2c87d27006c2b610668ebc4ff1f7c3ba Mon Sep 17 00:00:00 2001 From: Neeraj Upadhyay Date: Fri, 8 Mar 2019 15:16:18 +0530 Subject: rcu: Fix self-wakeups for grace-period kthread The current rcu_gp_kthread_wake() function uses in_interrupt() and thus does a self-wakeup from all interrupt contexts, including the pointless case where the GP kthread happens to be running with bottom halves disabled, along with the impossible case where the GP kthread is running within an NMI handler (you are not supposed to invoke rcu_gp_kthread_wake() from within an NMI handler. This commit therefore replaces the in_interrupt() with in_irq(), so that the self-wakeups happen only from handlers for hardware interrupts and softirqs. This also makes the code match the comment. Signed-off-by: Neeraj Upadhyay Signed-off-by: Paul E. McKenney Acked-by: Steven Rostedt (VMware) --- kernel/rcu/tree.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'kernel/rcu') diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index 5aefd36ac648..139fa1f5c537 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -1585,7 +1585,7 @@ static bool rcu_future_gp_cleanup(struct rcu_node *rnp) static void rcu_gp_kthread_wake(void) { if ((current == rcu_state.gp_kthread && - !in_interrupt() && !in_serving_softirq()) || + !in_irq() && !in_serving_softirq()) || !READ_ONCE(rcu_state.gp_flags) || !rcu_state.gp_kthread) return; -- cgit v1.2.3