[PATCH 04/10] workqueue: don't set the worker's cpumask when kthread_bind_mask()

[Lai Jiangshan]

From: Lai Jiangshan <la...@linux.alibaba.com>

There might be no online cpu in the pool->attrs->cpumask.
We will set the worker's cpumask later in worker_attach_to_pool().

Cc: Peter Zijlstra <pet...@infradead.org>
Signed-off-by: Lai Jiangshan <la...@linux.alibaba.com>
---
 kernel/workqueue.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 1f6cb83e0bc5..f679c599a70b 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -1945,7 +1945,15 @@ static struct worker *create_worker(struct worker_pool 
*pool)
                goto fail;
 
        set_user_nice(worker->task, pool->attrs->nice);
-       kthread_bind_mask(worker->task, pool->attrs->cpumask);
+
+       /*
+        * Set PF_NO_SETAFFINITY via kthread_bind_mask().  We use
+        * cpu_possible_mask other than pool->attrs->cpumask, because
+        * there might be no online cpu in the pool->attrs->cpumask.
+        * The cpumask of the worker will be set properly later in
+        * worker_attach_to_pool().
+        */
+       kthread_bind_mask(worker->task, cpu_possible_mask);
 
        /* successful, attach the worker to the pool */
        worker_attach_to_pool(worker, pool);
-- 
2.19.1.6.gb485710b