Commit 2865a8fb authored by Shaohua Li's avatar Shaohua Li Committed by Tejun Heo

workqueue: copy workqueue_attrs with all fields

 $echo '0' > /sys/bus/workqueue/devices/xxx/numa
 $cat /sys/bus/workqueue/devices/xxx/numa

I got 1. It should be 0, the reason is copy_workqueue_attrs() called
in apply_workqueue_attrs() doesn't copy no_numa field.

Fix it by making copy_workqueue_attrs() copy ->no_numa too.  This
would also make get_unbound_pool() set a pool's ->no_numa attribute
according to the workqueue attributes used when the pool was created.
While harmelss, as ->no_numa isn't a pool attribute, this is a bit
confusing.  Clear it explicitly.

tj: Updated description and comments a bit.
Signed-off-by: default avatarShaohua Li <shli@fusionio.com>
Signed-off-by: default avatarTejun Heo <tj@kernel.org>
Cc: stable@vger.kernel.org
parent c2fda509
......@@ -3416,6 +3416,12 @@ static void copy_workqueue_attrs(struct workqueue_attrs *to,
{
to->nice = from->nice;
cpumask_copy(to->cpumask, from->cpumask);
/*
* Unlike hash and equality test, this function doesn't ignore
* ->no_numa as it is used for both pool and wq attrs. Instead,
* get_unbound_pool() explicitly clears ->no_numa after copying.
*/
to->no_numa = from->no_numa;
}
/* hash value of the content of @attr */
......@@ -3583,6 +3589,12 @@ static struct worker_pool *get_unbound_pool(const struct workqueue_attrs *attrs)
lockdep_set_subclass(&pool->lock, 1); /* see put_pwq() */
copy_workqueue_attrs(pool->attrs, attrs);
/*
* no_numa isn't a worker_pool attribute, always clear it. See
* 'struct workqueue_attrs' comments for detail.
*/
pool->attrs->no_numa = false;
/* if cpumask is contained inside a NUMA node, we belong to that node */
if (wq_numa_enabled) {
for_each_node(node) {
......
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