Commit 73f36f9d authored Nov 17, 2015 by Paul E. McKenney

rcu: Make expedited grace periods resolve stall-warning ties

Currently, if a grace period ends just as the stall-warning timeout
fires, an empty stall warning will be printed. This is not helpful,
so this commit avoids these useless warnings by rechecking completion
after awakening in synchronize_sched_expedited_wait().

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

parent df5bd514

kernel/rcu/tree.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -3757,7 +3757,7 @@ static void synchronize_sched_expedited_wait(struct rcu_state *rsp)
		rsp->expedited_wq,
		sync_rcu_preempt_exp_done(rnp_root),
		jiffies_stall);
		if (ret > 0)
		if (ret > 0 \|\| sync_rcu_preempt_exp_done(rnp_root))
		return;
		if (ret < 0) {
		/* Hit a signal, disable CPU stall warnings. */