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From: Tiejun Chen <tiejun.chen@windriver.com>
To: <bigeasy@linutronix.de>, <tglx@linutronix.de>
Cc: <linux-rt-users@vger.kernel.org>
Subject: [PATCH 1/1] rcutree/rcu_bh_qs: disable irq while calling rcu_preempt_qs()
Date: Thu, 5 Dec 2013 17:52:42 +0800	[thread overview]
Message-ID: <1386237162-10141-1-git-send-email-tiejun.chen@windriver.com> (raw)

Any callers should make sure irq is disabled before calling rcu_preempt_qs().

Signed-off-by: Tiejun Chen <tiejun.chen@windriver.com>
---
 kernel/rcutree.c |    5 +++++
 1 file changed, 5 insertions(+)

diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index 7ec834d..6f6d133 100644
--- a/kernel/rcutree.c
+++ b/kernel/rcutree.c
@@ -186,7 +186,12 @@ static void rcu_preempt_qs(int cpu);
 
 void rcu_bh_qs(int cpu)
 {
+	unsigned long flags;
+
+	/* Callers to this function, rcu_preempt_qs(), must disable irqs. */
+	local_irq_save(flags);
 	rcu_preempt_qs(cpu);
+	local_irq_restore(flags);
 }
 #else
 void rcu_bh_qs(int cpu)
-- 
1.7.9.5


             reply	other threads:[~2013-12-05  9:52 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-12-05  9:52 Tiejun Chen [this message]
2013-12-05 15:26 ` [PATCH 1/1] rcutree/rcu_bh_qs: disable irq while calling rcu_preempt_qs() Paul Gortmaker
2013-12-06  1:57   ` "“tiejun.chen”"
2013-12-06 17:13     ` Paul Gortmaker
2013-12-15 12:01       ` Sebastian Andrzej Siewior

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