linux-kernel - [PATCH 12/12] workqueue: avoid work_on_cpu() to interfere system

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Message-Id: <1348680043-5077-13-git-send-email-laijs@cn.fujitsu.com>
Date:	Thu, 27 Sep 2012 01:20:43 +0800
From:	Lai Jiangshan <laijs@...fujitsu.com>
To:	Tejun Heo <tj@...nel.org>, linux-kernel@...r.kernel.org
Cc:	Lai Jiangshan <laijs@...fujitsu.com>
Subject: [PATCH 12/12] workqueue: avoid work_on_cpu() to interfere system_wq

We can't expect how long the work of work_on_cpu() will run.
So move it to system_long_wq to avoid it interfere system_wq.

Note:
The initial implement(2d3854a3) of work_on_cpu() uses its own workqueue.

Signed-off-by: Lai Jiangshan <laijs@...fujitsu.com>
---
 kernel/workqueue.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index ccb1d60..c14d94c 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -3638,7 +3638,7 @@ long work_on_cpu(unsigned int cpu, long (*fn)(void *), void *arg)
 	struct work_for_cpu wfc = { .fn = fn, .arg = arg };
 
 	INIT_WORK_ONSTACK(&wfc.work, work_for_cpu_fn);
-	schedule_work_on(cpu, &wfc.work);
+	queue_work_on(cpu, system_long_wq, &wfc.work);
 	flush_work(&wfc.work);
 	return wfc.ret;
 }
-- 
1.7.7.6

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