workqueue: alloc struct worker on its local node

When the create_worker() is called from non-manager, the struct worker
is allocated from the node of the caller which may be different from the
node of pool->node.

So we add a node ID argument for the alloc_worker() to ensure the
struct worker is allocated from the preferable node.

tj: @nid renamed to @node for consistency.

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

kernel/workqueue.c

@@ -1595,11 +1595,11 @@ static void worker_leave_idle(struct worker *worker)
 	list_del_init(&worker->entry);
 }
 
-static struct worker *alloc_worker(void)
+static struct worker *alloc_worker(int node)
 {
 	struct worker *worker;
 
-	worker = kzalloc(sizeof(*worker), GFP_KERNEL);
+	worker = kzalloc_node(sizeof(*worker), GFP_KERNEL, node);
 	if (worker) {
 		INIT_LIST_HEAD(&worker->entry);
 		INIT_LIST_HEAD(&worker->scheduled);
@@ -1694,7 +1694,7 @@ static struct worker *create_worker(struct worker_pool *pool)
 	if (id < 0)
 		goto fail;
 
-	worker = alloc_worker();
+	worker = alloc_worker(pool->node);
 	if (!worker)
 		goto fail;
 
@@ -4110,7 +4110,7 @@ struct workqueue_struct *__alloc_workqueue_key(const char *fmt,
 	if (flags & WQ_MEM_RECLAIM) {
 		struct worker *rescuer;
 
-		rescuer = alloc_worker();
+		rescuer = alloc_worker(NUMA_NO_NODE);
 		if (!rescuer)
 			goto err_destroy;