[PATCH RFC 2/3] workqueue: allocate percpu pwqs through alloc_pwq()

[Breno Leitao]

Route the per-cpu pwq allocation loop in alloc_and_link_pwqs() through the
common alloc_pwq() instead of open-coding get_percpu_pool() + pwq
allocation + init_pwq().  alloc_pwq() is now the single entry point for
both percpu and unbound pwq allocation, and its percpu branch is exercised
for every percpu workqueue created.

No functional change: alloc_pwq(wq, cpu, NULL) on a percpu workqueue
selects the static per-cpu pool for @cpu, exactly as the open-coded path
did.

Signed-off-by: Breno Leitao <leitao@xxxxxxxxxx>
---
 kernel/workqueue.c | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index c32e173af2335..50baf4fe5fcf5 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -5703,15 +5703,11 @@ static int alloc_and_link_pwqs(struct workqueue_struct *wq)
 	if (!(wq->flags & WQ_UNBOUND)) {
 		for_each_possible_cpu(cpu) {
 			struct pool_workqueue **pwq_p = per_cpu_ptr(wq->cpu_pwq, cpu);
-			struct worker_pool *pool = get_percpu_pool(wq, cpu);
 
-			*pwq_p = kmem_cache_alloc_node(pwq_cache, GFP_KERNEL,
-						       pool->node);
+			*pwq_p = alloc_pwq(wq, cpu, NULL);
 			if (!*pwq_p)
 				goto enomem;
 
-			init_pwq(*pwq_p, wq, pool);
-
 			mutex_lock(&wq->mutex);
 			link_pwq(*pwq_p);
 			mutex_unlock(&wq->mutex);

-- 
2.53.0-Meta