workqueue: BUG_ON() instead of returning NULL in wq_node_nr_active()

wq_node_nr_active() warns and returns NULL when @wq is not unbound, but every caller dereferences the result right away, so the WARN_ON_ONCE() only moves the oops one frame up, as raised by Tejun. Fix it by BUGing_ON() instead of this silly WARN_ON_ONCE();

Breno Leitao committed 3 months ago

Commit 4e0ee511 parent 1d125f01 file · +1 −2Browse files

Unified · Split

kernel/workqueue.c+1−2

@@ -1625,8 +1625,7 @@ static bool is_percpu_pool(struct worker_pool *pool) · 1624 unmodified lines
1625	1625	static struct wq_node_nr_active wq_node_nr_active(struct workqueue_struct wq,
1626	1626	int node)
1627	1627	{
1628		− if (WARN_ON_ONCE(!(wq->flags & WQ_UNBOUND)))
1629		− return NULL;
	1628	+ BUG_ON(!(wq->flags & WQ_UNBOUND));
1630	1629
1631	1630	if (node == NUMA_NO_NODE)
1632	1631	node = nr_node_ids;