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From: Ingo Molnar <mingo@kernel.org>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: linux-kernel@vger.kernel.org,
	Peter Zijlstra <a.p.zijlstra@chello.nl>,
	Thomas Gleixner <tglx@linutronix.de>,
	Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
	"Paul E. McKenney" <paulmck@kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>
Subject: [GIT PULL] membarrier fix
Date: Thu, 3 Oct 2019 00:04:06 +0200	[thread overview]
Message-ID: <20191002220406.GA50484@gmail.com> (raw)

Linus,

Please pull the latest sched-urgent-for-linus git tree from:

   git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git sched-urgent-for-linus

   # HEAD: 73956fc07dd7b25d4a33ab3fdd6247c60d0b237c membarrier: Fix RCU locking bug caused by faulty merge

Fix a merge bug that resulted in broken locking within 
membarrier_private_expedited().

 Thanks,

	Ingo

------------------>
Peter Zijlstra (1):
      membarrier: Fix RCU locking bug caused by faulty merge


 kernel/sched/membarrier.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/kernel/sched/membarrier.c b/kernel/sched/membarrier.c
index a39bed2c784f..168479a7d61b 100644
--- a/kernel/sched/membarrier.c
+++ b/kernel/sched/membarrier.c
@@ -174,7 +174,6 @@ static int membarrier_private_expedited(int flags)
 		 */
 		if (cpu == raw_smp_processor_id())
 			continue;
-		rcu_read_lock();
 		p = rcu_dereference(cpu_rq(cpu)->curr);
 		if (p && p->mm == mm)
 			__cpumask_set_cpu(cpu, tmpmask);

             reply	other threads:[~2019-10-02 22:04 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-02 22:04 Ingo Molnar [this message]
2019-10-02 23:00 ` [GIT PULL] membarrier fix pr-tracker-bot

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