From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tiejun Chen Subject: [PATCH 1/1] rcutree/rcu_bh_qs: disable irq while calling rcu_preempt_qs() Date: Thu, 5 Dec 2013 17:52:42 +0800 Message-ID: <1386237162-10141-1-git-send-email-tiejun.chen@windriver.com> Mime-Version: 1.0 Content-Type: text/plain Cc: To: , Return-path: Received: from mail.windriver.com ([147.11.1.11]:52960 "EHLO mail.windriver.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755270Ab3LEJwf (ORCPT ); Thu, 5 Dec 2013 04:52:35 -0500 Sender: linux-rt-users-owner@vger.kernel.org List-ID: Any callers should make sure irq is disabled before calling rcu_preempt_qs(). Signed-off-by: Tiejun Chen --- 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