Merge tag 'slab-for-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/vbabka/slab

Pull slab updates from Vlastimil Babka:
"This time it's just a bunch of smaller cleanups and fixes for SLAB and
SLUB:

- Make it possible to use kmem_cache_alloc_bulk() early in boot when
interrupts are not yet enabled, as code doing that started to
appear via new maple tree users (Thomas Gleixner)

- Fix debugfs-related memory leak in SLUB (Greg Kroah-Hartman)

- Use the standard idiom to get head page of folio (SeongJae Park)

- Simplify and inline is_debug_pagealloc_cache() in SLAB (lvqian)

- Remove unused variable in SLAB (Gou Hao)"

* tag 'slab-for-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/vbabka/slab:
mm, slab/slub: Ensure kmem_cache_alloc_bulk() is available early
mm/slub: fix memory leak with using debugfs_lookup()
mm/slab.c: cleanup is_debug_pagealloc_cache()
mm/sl{a,u}b: fix wrong usages of folio_page() for getting head pages
mm/slab: remove unused slab_early_init

mm/slab.c

···
 static inline void fixup_slab_list(struct kmem_cache *cachep,
 				struct kmem_cache_node *n, struct slab *slab,
 				void **list);
-static int slab_early_init = 1;
 
 #define INDEX_NODE kmalloc_index(sizeof(struct kmem_cache_node))
 
···
 	slab_state = PARTIAL_NODE;
 	setup_kmalloc_cache_index_table();
 
-	slab_early_init = 0;
-
 	/* 5) Replace the bootstrap kmem_cache_node */
 	{
 		int nid;
···
 
 	BUG_ON(!folio_test_slab(folio));
 	__slab_clear_pfmemalloc(slab);
-	page_mapcount_reset(folio_page(folio, 0));
+	page_mapcount_reset(&folio->page);
 	folio->mapping = NULL;
 	/* Make the mapping reset visible before clearing the flag */
 	smp_wmb();
···
 	if (current->reclaim_state)
 		current->reclaim_state->reclaimed_slab += 1 << order;
 	unaccount_slab(slab, order, cachep);
-	__free_pages(folio_page(folio, 0), order);
+	__free_pages(&folio->page, order);
 }
 
 static void kmem_rcu_free(struct rcu_head *head)
···
 }
 
 #if DEBUG
-static bool is_debug_pagealloc_cache(struct kmem_cache *cachep)
+static inline bool is_debug_pagealloc_cache(struct kmem_cache *cachep)
 {
-	if (debug_pagealloc_enabled_static() && OFF_SLAB(cachep) &&
-		(cachep->size % PAGE_SIZE) == 0)
-		return true;
-
-	return false;
+	return debug_pagealloc_enabled_static() && OFF_SLAB(cachep) &&
+			((cachep->size % PAGE_SIZE) == 0);
 }
 
 #ifdef CONFIG_DEBUG_PAGEALLOC
···
 int kmem_cache_alloc_bulk(struct kmem_cache *s, gfp_t flags, size_t size,
 			  void **p)
 {
-	size_t i;
 	struct obj_cgroup *objcg = NULL;
+	unsigned long irqflags;
+	size_t i;
 
 	s = slab_pre_alloc_hook(s, NULL, &objcg, size, flags);
 	if (!s)
 		return 0;
 
-	local_irq_disable();
+	local_irq_save(irqflags);
 	for (i = 0; i < size; i++) {
 		void *objp = kfence_alloc(s, s->object_size, flags) ?:
 			     __do_cache_alloc(s, flags, NUMA_NO_NODE);
···
 			goto error;
 		p[i] = objp;
 	}
-	local_irq_enable();
+	local_irq_restore(irqflags);
 
 	cache_alloc_debugcheck_after_bulk(s, flags, size, p, _RET_IP_);
 
···
 	/* FIXME: Trace call missing. Christoph would like a bulk variant */
 	return size;
 error:
-	local_irq_enable();
+	local_irq_restore(irqflags);
 	cache_alloc_debugcheck_after_bulk(s, flags, i, p, _RET_IP_);
 	slab_post_alloc_hook(s, objcg, flags, i, p, false, s->object_size);
 	kmem_cache_free_bulk(s, i, p);
···
 
 void kmem_cache_free_bulk(struct kmem_cache *orig_s, size_t size, void **p)
 {
+	unsigned long flags;
 
-	local_irq_disable();
+	local_irq_save(flags);
 	for (int i = 0; i < size; i++) {
 		void *objp = p[i];
 		struct kmem_cache *s;
···
 
 			/* called via kfree_bulk */
 			if (!folio_test_slab(folio)) {
-				local_irq_enable();
+				local_irq_restore(flags);
 				free_large_kmalloc(folio, objp);
-				local_irq_disable();
+				local_irq_save(flags);
 				continue;
 			}
 			s = folio_slab(folio)->slab_cache;
···
 
 		__cache_free(s, objp, _RET_IP_);
 	}
-	local_irq_enable();
+	local_irq_restore(flags);
 
 	/* FIXME: add tracing */
 }

mm/slub.c

···
 	if (current->reclaim_state)
 		current->reclaim_state->reclaimed_slab += pages;
 	unaccount_slab(slab, order, s);
-	__free_pages(folio_page(folio, 0), order);
+	__free_pages(&folio->page, order);
 }
 
 static void rcu_free_slab(struct rcu_head *h)
···
 			size_t size, void **p, struct obj_cgroup *objcg)
 {
 	struct kmem_cache_cpu *c;
+	unsigned long irqflags;
 	int i;
 
 	/*
···
 	 * handlers invoking normal fastpath.
 	 */
 	c = slub_get_cpu_ptr(s->cpu_slab);
-	local_lock_irq(&s->cpu_slab->lock);
+	local_lock_irqsave(&s->cpu_slab->lock, irqflags);
 
 	for (i = 0; i < size; i++) {
 		void *object = kfence_alloc(s, s->object_size, flags);
···
 			 */
 			c->tid = next_tid(c->tid);
 
-			local_unlock_irq(&s->cpu_slab->lock);
+			local_unlock_irqrestore(&s->cpu_slab->lock, irqflags);
 
 			/*
 			 * Invoking slow path likely have side-effect
···
 			c = this_cpu_ptr(s->cpu_slab);
 			maybe_wipe_obj_freeptr(s, p[i]);
 
-			local_lock_irq(&s->cpu_slab->lock);
+			local_lock_irqsave(&s->cpu_slab->lock, irqflags);
 
 			continue; /* goto for-loop */
 		}
···
 		maybe_wipe_obj_freeptr(s, p[i]);
 	}
 	c->tid = next_tid(c->tid);
-	local_unlock_irq(&s->cpu_slab->lock);
+	local_unlock_irqrestore(&s->cpu_slab->lock, irqflags);
 	slub_put_cpu_ptr(s->cpu_slab);
 
 	return i;
···
 
 void debugfs_slab_release(struct kmem_cache *s)
 {
-	debugfs_remove_recursive(debugfs_lookup(s->name, slab_debugfs_root));
+	debugfs_lookup_and_remove(s->name, slab_debugfs_root);
 }
 
 static int __init slab_debugfs_init(void)