linux-kernel - [PATCH]rcu classic: update qlen when cpu offline

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Message-ID: <4862F9B3.5030300@cn.fujitsu.com>
Date:	Thu, 26 Jun 2008 10:06:43 +0800
From:	Lai Jiangshan <laijs@...fujitsu.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: [PATCH]rcu classic: update qlen when cpu offline


When callbacks are moved from offline cpu to this cpu,
the qlen field of this rdp should be updated.

Signed-off-by: Lai Jiangshan <laijs@...fujitsu.com>
---
diff --git a/kernel/rcuclassic.c b/kernel/rcuclassic.c
index f4ffbd0..42aead6 100644
--- a/kernel/rcuclassic.c
+++ b/kernel/rcuclassic.c
@@ -373,6 +373,10 @@ static void __rcu_offline_cpu(struct rcu_data *this_rdp,
 	rcu_move_batch(this_rdp, rdp->donelist, rdp->donetail);
 	rcu_move_batch(this_rdp, rdp->curlist, rdp->curtail);
 	rcu_move_batch(this_rdp, rdp->nxtlist, rdp->nxttail);
+
+	local_irq_disable();
+	this_rdp->qlen += rdp->qlen;
+	local_irq_enable();
 }
 
 static void rcu_offline_cpu(int cpu)


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