From: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Date: Sat, 28 Apr 2018 04:25:01 +0000 (-0700)
Subject: rcu: Move rcu_gp_in_progress() to ->gp_seq
X-Git-Tag: v4.19-rc1~214^2^2~77
X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=ba04107fc901ddce49686944f7e038b4f0b0a359;p=uclinux-h8%2Flinux.git

rcu: Move rcu_gp_in_progress() to ->gp_seq

This commit makes rcu_gp_in_progress() use ->gp_seq instead of
->completed and ->gpnum.  The READ_ONCE() invocations are buried
in rcu_seq_current().

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

diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index b3af3d24286c..56445f4c09a8 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -219,7 +219,7 @@ unsigned long rcu_rnp_online_cpus(struct rcu_node *rnp)
  */
 static int rcu_gp_in_progress(struct rcu_state *rsp)
 {
-	return READ_ONCE(rsp->completed) != READ_ONCE(rsp->gpnum);
+	return rcu_seq_state(rcu_seq_current(&rsp->gp_seq));
 }
 
 /*