Commit 91f63ced authored by Paul E. McKenney's avatar Paul E. McKenney
Browse files

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: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
parent 77cfc7bf

kernel/rcu/tree.c

+2 −2
Original line number Diff line number Diff line
@@ -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);

}