linux-kernel - [GIT PULL] workqueue fixes for v4.3-rc5

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Date:	Tue, 13 Oct 2015 17:49:52 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org,
	Lai Jiangshan <jiangshanlai@...il.com>,
	Shaohua Li <shli@...com>
Subject: [GIT PULL] workqueue fixes for v4.3-rc5

Hello, Linus.

Single patch to fix delayed work being queued on the wrong CPU.  This
has been broken forever (v2.6.31+) but obviously doesn't trigger in
most configurations.

Thanks.

The following changes since commit 9ffecb10283508260936b96022d4ee43a7798b4c:

  Linux 4.3-rc3 (2015-09-27 07:50:08 -0400)

are available in the git repository at:

  git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq.git for-4.3-fixes

for you to fetch changes up to 874bbfe600a660cba9c776b3957b1ce393151b76:

  workqueue: make sure delayed work run in local cpu (2015-09-30 13:06:46 -0400)

----------------------------------------------------------------
Shaohua Li (1):
      workqueue: make sure delayed work run in local cpu

 kernel/workqueue.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index ca71582..bcb14ca 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -1458,13 +1458,13 @@ static void __queue_delayed_work(int cpu, struct workqueue_struct *wq,
 	timer_stats_timer_set_start_info(&dwork->timer);
 
 	dwork->wq = wq;
+	/* timer isn't guaranteed to run in this cpu, record earlier */
+	if (cpu == WORK_CPU_UNBOUND)
+		cpu = raw_smp_processor_id();
 	dwork->cpu = cpu;
 	timer->expires = jiffies + delay;
 
-	if (unlikely(cpu != WORK_CPU_UNBOUND))
-		add_timer_on(timer, cpu);
-	else
-		add_timer(timer);
+	add_timer_on(timer, cpu);
 }
 
 /**

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