linux-kernel - [RFC PATCH 1/1] kernel/rcu/tree.c: correct a check for grace period in progress

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Message-Id: <1402456819-30515-1-git-send-email-bobby.prani@gmail.com>
Date:	Tue, 10 Jun 2014 23:20:19 -0400
From:	Pranith Kumar <bobby.prani@...il.com>
To:	Dipankar Sarma <dipankar@...ibm.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org (open list:READ-COPY UPDATE...)
Subject: [RFC PATCH 1/1] kernel/rcu/tree.c: correct a check for grace period in progress

The comment above the code says that we are checking both the current node and
the parent node to see if a grace period is in progress. Change the code
accordingly.

Signed-off-by: Pranith Kumar <bobby.prani@...il.com>
---
 kernel/rcu/tree.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index f1ba773..b632189 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -1227,7 +1227,7 @@ rcu_start_future_gp(struct rcu_node *rnp, struct rcu_data *rdp,
 	 * need to explicitly start one.
 	 */
 	if (rnp->gpnum != rnp->completed ||
-	    ACCESS_ONCE(rnp->gpnum) != ACCESS_ONCE(rnp->completed)) {
+	    ACCESS_ONCE(rnp_root->gpnum) != ACCESS_ONCE(rnp_root->completed)) {
 		rnp->need_future_gp[c & 0x1]++;
 		trace_rcu_future_gp(rnp, rdp, c, TPS("Startedleaf"));
 		goto out;
-- 
1.9.1

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