Merge branch 'slab/for-6.3/fixes' into slab/for-linus

Two 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 start to appear via
  the maple tree (by Thomas Gleixner).
- Fix debugfs-related memory leak (by Greg Kroah-Hartman).

Author: tehcaster

mm/slab.c

@@ -3473,14 +3473,15 @@ cache_alloc_debugcheck_after_bulk(struct kmem_cache *s, gfp_t flags,
 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);
@@ -3489,7 +3490,7 @@ int kmem_cache_alloc_bulk(struct kmem_cache *s, gfp_t flags, size_t size,
 			goto error;
 		p[i] = objp;
 	}
-	local_irq_enable();
+	local_irq_restore(irqflags);
 
 	cache_alloc_debugcheck_after_bulk(s, flags, size, p, _RET_IP_);
 
@@ -3502,7 +3503,7 @@ int kmem_cache_alloc_bulk(struct kmem_cache *s, gfp_t flags, size_t size,
 	/* 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);
@@ -3604,8 +3605,9 @@ EXPORT_SYMBOL(kmem_cache_free);
 
 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;
@@ -3615,9 +3617,9 @@ void kmem_cache_free_bulk(struct kmem_cache *orig_s, size_t size, void **p)
 
 			/* 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;
@@ -3634,7 +3636,7 @@ void kmem_cache_free_bulk(struct kmem_cache *orig_s, size_t size, void **p)
 
 		__cache_free(s, objp, _RET_IP_);
 	}
-	local_irq_enable();
+	local_irq_restore(flags);
 
 	/* FIXME: add tracing */
 }

mm/slub.c

@@ -3913,6 +3913,7 @@ static inline int __kmem_cache_alloc_bulk(struct kmem_cache *s, gfp_t flags,
 			size_t size, void **p, struct obj_cgroup *objcg)
 {
 	struct kmem_cache_cpu *c;
+	unsigned long irqflags;
 	int i;
 
 	/*
@@ -3921,7 +3922,7 @@ static inline int __kmem_cache_alloc_bulk(struct kmem_cache *s, gfp_t flags,
 	 * 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);
@@ -3942,7 +3943,7 @@ static inline int __kmem_cache_alloc_bulk(struct kmem_cache *s, gfp_t 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
@@ -3956,7 +3957,7 @@ static inline int __kmem_cache_alloc_bulk(struct kmem_cache *s, gfp_t flags,
 			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 */
 		}
@@ -3965,7 +3966,7 @@ static inline int __kmem_cache_alloc_bulk(struct kmem_cache *s, gfp_t flags,
 		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;
@@ -6449,7 +6450,7 @@ static void debugfs_slab_add(struct kmem_cache *s)
 
 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)