Commit-ID: 91f63ced7dc4e80acd13386204327d5de00a672d Gitweb: https://git.kernel.org/tip/91f63ced7dc4e80acd13386204327d5de00a672d Author: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx> AuthorDate: Tue, 1 May 2018 15:05:45 -0700 Committer: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx> CommitDate: Thu, 12 Jul 2018 15:39:01 -0700 rcu: Replace smp_wmb() with smp_store_release() for stall check This commit gets rid of the smp_wmb() in record_gp_stall_check_time() in favor of an smp_store_release(). Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxxxxxxxxxx> --- kernel/rcu/tree.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index a4277c1087d9..439228b79811 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -1246,9 +1246,9 @@ static void record_gp_stall_check_time(struct rcu_state *rsp) unsigned long j1; rsp->gp_start = j; - smp_wmb(); /* Record start time before stall time. */ j1 = rcu_jiffies_till_stall_check(); - WRITE_ONCE(rsp->jiffies_stall, j + j1); + /* Record ->gp_start before ->jiffies_stall. */ + smp_store_release(&rsp->jiffies_stall, j + j1); /* ^^^ */ rsp->jiffies_resched = j + j1 / 2; rsp->n_force_qs_gpstart = READ_ONCE(rsp->n_force_qs); } -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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