Re: [rfc/patch] mm/slub: restore/expand unfreeze_partials() local exclusion scope

--- a/mm/slub.c
+++ b/mm/slub.c

@@ -2497,7 +2497,9 @@ static void put_cpu_partial(struct kmem_
 				 * partial array is full. Move the existing
 				 * set to the per node partial list.
 				 */
+				local_lock(&s->cpu_slab->lock);
 				unfreeze_partials(s);
+				local_unlock(&s->cpu_slab->lock);
 				oldpage = NULL;
 				pobjects = 0;
 				pages = 0;

@@ -2579,7 +2581,9 @@ static void flush_cpu_slab(struct work_s
 	if (c->page)
 		flush_slab(s, c, true);
 
+	local_lock(&s->cpu_slab->lock);
 	unfreeze_partials(s);
+	local_unlock(&s->cpu_slab->lock);
 }
 
 static bool has_cpu_slab(int cpu, struct kmem_cache *s)

@@ -2632,8 +2636,11 @@ static int slub_cpu_dead(unsigned int cp
 	struct kmem_cache *s;
 
 	mutex_lock(&slab_mutex);
-	list_for_each_entry(s, &slab_caches, list)
+	list_for_each_entry(s, &slab_caches, list) {
+		local_lock(&s->cpu_slab->lock);