linux-kernel - [PATCH 4/8] kernel/workqueue.c: unbound work queue rescuer runs on first cpu in cpumask_online

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Message-Id: <1317832759-10223-5-git-send-email-fenghua.yu@intel.com>
Date:	Wed,  5 Oct 2011 09:39:15 -0700
From:	"Fenghua Yu" <fenghua.yu@...el.com>
To:	"Ingo Molnar" <mingo@...e.hu>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"H Peter Anvin" <hpa@...or.com>,
	"Zwane Mwaikambo" <zwane@....linux.org.uk>,
	"Tony Luck" <tony.luck@...el.com>,
	"Asit K Mallick" <asit.k.mallick@...el.com>,
	"Suresh B Siddha" <suresh.b.siddha@...el.com>,
	"Len Brown" <lenb@...nel.org>
Cc:	"linux-kernel" <linux-kernel@...r.kernel.org>,
	"Fenghua Yu" <fenghua.yu@...el.com>
Subject: [PATCH 4/8] kernel/workqueue.c: unbound work queue rescuer runs on first cpu in cpumask_online_cpu

From: Fenghua Yu <fenghua.yu@...el.com>

If work queue is unbound to a specific cpu, run rescuer on first cpu in
cpumask_online_cpu instead BSP which could be offlined.

Signed-off-by: Fenghua Yu <fenghua.yu@...el.com>
---
 kernel/workqueue.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 1783aab..d26e411 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -1496,9 +1496,9 @@ static bool send_mayday(struct work_struct *work)
 
 	/* mayday mayday mayday */
 	cpu = cwq->gcwq->cpu;
-	/* WORK_CPU_UNBOUND can't be set in cpumask, use cpu 0 instead */
+	/* WORK_CPU_UNBOUND can't be set in cpumask, use first cpu instead */
 	if (cpu == WORK_CPU_UNBOUND)
-		cpu = 0;
+		cpu = cpumask_first(cpu_online_mask);
 	if (!mayday_test_and_set_cpu(cpu, wq->mayday_mask))
 		wake_up_process(wq->rescuer->task);
 	return true;
-- 
1.6.0.3

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