From: Paul E. McKenney Date: Tue, 17 Nov 2015 18:56:55 +0000 (-0800) Subject: rcu: Make expedited grace periods resolve stall-warning ties X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=73f36f9de8bed78bcda2704a348594c20518b455;p=linux-beck.git 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 --- diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index 33d7e2551165..bc6b79716a86 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -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. */