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List:       linux-rt-users
Subject:    [PATCH RT 1/3] rcu/swait: Fix RCU conversion of wake_up_all() to swait_wake()
From:       Steven Rostedt <rostedt () goodmis ! org>
Date:       2013-08-19 15:35:31
Message-ID: 20130819153618.854174262 () goodmis ! org
[Download RAW message or body]

From: Steven Rostedt <rostedt@goodmis.org>

Reverting the rcu swait patches fixed the boot problem. Then when I was
looking at the revert itself, this stood out like a sore thumb.

 static void rcu_nocb_gp_cleanup(struct rcu_state *rsp, struct rcu_node *rnp) {
-       swait_wake(&rnp->nocb_gp_wq[rnp->completed & 0x1]);
+       wake_up_all(&rnp->nocb_gp_wq[rnp->completed & 0x1]);
 }

See the problem there?

Reviewed-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
 kernel/rcutree_plugin.h |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/rcutree_plugin.h b/kernel/rcutree_plugin.h
index 684b762..dc0c4b2 100644
--- a/kernel/rcutree_plugin.h
+++ b/kernel/rcutree_plugin.h
@@ -2036,7 +2036,7 @@ static int rcu_nocb_needs_gp(struct rcu_state *rsp)
  */
 static void rcu_nocb_gp_cleanup(struct rcu_state *rsp, struct rcu_node *rnp)
 {
-	swait_wake(&rnp->nocb_gp_wq[rnp->completed & 0x1]);
+	swait_wake_all(&rnp->nocb_gp_wq[rnp->completed & 0x1]);
 }
 
 /*
-- 
1.7.10.4


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