linux-kernel - [tip:core/rcu] rcu: Cleanup: balance rcu_irq_enter()/rcu_irq

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Date:	Mon, 2 Nov 2009 16:18:29 GMT
From:	tip-bot for Lai Jiangshan <laijs@...fujitsu.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, paulmck@...ux.vnet.ibm.com,
	hpa@...or.com, mingo@...hat.com, tglx@...utronix.de,
	laijs@...fujitsu.com, mingo@...e.hu
Subject: [tip:core/rcu] rcu: Cleanup: balance rcu_irq_enter()/rcu_irq_exit() calls

Commit-ID:  c5e0cb3ddc5f14cedcfc50c0fb3b5fc6b56576da
Gitweb:     http://git.kernel.org/tip/c5e0cb3ddc5f14cedcfc50c0fb3b5fc6b56576da
Author:     Lai Jiangshan <laijs@...fujitsu.com>
AuthorDate: Wed, 28 Oct 2009 08:14:48 -0700
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Mon, 2 Nov 2009 16:06:37 +0100

rcu: Cleanup: balance rcu_irq_enter()/rcu_irq_exit() calls

Currently, rcu_irq_exit() is invoked only for CONFIG_NO_HZ,
while rcu_irq_enter() is invoked unconditionally.  This patch
moves rcu_irq_exit() out from under CONFIG_NO_HZ so that the
calls are balanced.

This patch has no effect on the behavior of the kernel because
both rcu_irq_enter() and rcu_irq_exit() are empty for
!CONFIG_NO_HZ, but the code is easier to understand if the calls
are obviously balanced in all cases.

Signed-off-by: Lai Jiangshan <laijs@...fujitsu.com>
Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
Cc: dipankar@...ibm.com
Cc: mathieu.desnoyers@...ymtl.ca
Cc: josh@...htriplett.org
Cc: dvhltc@...ibm.com
Cc: niv@...ibm.com
Cc: peterz@...radead.org
Cc: rostedt@...dmis.org
Cc: Valdis.Kletnieks@...edu
Cc: dhowells@...hat.com
LKML-Reference: <12567428891605-git-send-email->
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 kernel/softirq.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/kernel/softirq.c b/kernel/softirq.c
index f8749e5..21939d9 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -302,9 +302,9 @@ void irq_exit(void)
 	if (!in_interrupt() && local_softirq_pending())
 		invoke_softirq();
 
+	rcu_irq_exit();
 #ifdef CONFIG_NO_HZ
 	/* Make sure that timer wheel updates are propagated */
-	rcu_irq_exit();
 	if (idle_cpu(smp_processor_id()) && !in_interrupt() && !need_resched())
 		tick_nohz_stop_sched_tick(0);
 #endif
--
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