linux-kernel - [PATCH] slub: let need_slab_obj_exts() return false if SLAB_NO_OBJ

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Message-ID: <20260205120709.425719-1-hao.li@linux.dev>
Date: Thu, 5 Feb 2026 20:07:23 +0800
From: Hao Li <hao.li@...ux.dev>
To: vbabka@...e.cz, harry.yoo@...cle.com, akpm@...ux-foundation.org, 
	cl@...two.org, rientjes@...gle.com, roman.gushchin@...ux.dev, 
	linux-mm@...ck.org, linux-kernel@...r.kernel.org, hao.li@...ux.dev
Cc: akpm@...ux-foundation.org, cl@...two.org, rientjes@...gle.com, 
	roman.gushchin@...ux.dev, linux-mm@...ck.org, linux-kernel@...r.kernel.org, 
	Hao Li <hao.li@...ux.dev>
Subject: [PATCH] slub: let need_slab_obj_exts() return false if
 SLAB_NO_OBJ_EXT is set

SLAB_NO_OBJ_EXT is set for boot caches, but need_slab_obj_exts() doesn't
check this flag. We should return false unconditionally when
SLAB_NO_OBJ_EXT is set.

Signed-off-by: Hao Li <hao.li@...ux.dev>
---
 mm/slub.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/mm/slub.c b/mm/slub.c
index 865047eaf02b..3b1402e1c39d 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -901,6 +901,9 @@ static inline unsigned long get_orig_size(struct kmem_cache *s, void *object)
  */
 static inline bool need_slab_obj_exts(struct kmem_cache *s)
 {
+	if (s->flags & SLAB_NO_OBJ_EXT)
+		return false;
+
 	if (memcg_kmem_online() && (s->flags & SLAB_ACCOUNT))
 		return true;
 
-- 
2.50.1