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

[Fenghua Yu]

From: Fenghua Yu <fenghua.yu@xxxxxxxxx>

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@xxxxxxxxx>
---
 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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