linux-kernel - [PATCH 1/1] mm/slab: remove duplicate check in create

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Message-ID: <20240821032637.1930-1-thunder.leizhen@huawei.com>
Date: Wed, 21 Aug 2024 11:26:37 +0800
From: Zhen Lei <thunder.leizhen@...wei.com>
To: Christoph Lameter <cl@...ux.com>, Pekka Enberg <penberg@...nel.org>, David
 Rientjes <rientjes@...gle.com>, Joonsoo Kim <iamjoonsoo.kim@....com>, Andrew
 Morton <akpm@...ux-foundation.org>, Vlastimil Babka <vbabka@...e.cz>, Roman
 Gushchin <roman.gushchin@...ux.dev>, Hyeonggon Yoo <42.hyeyoo@...il.com>,
	<linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>
CC: Zhen Lei <thunder.leizhen@...wei.com>
Subject: [PATCH 1/1] mm/slab: remove duplicate check in create_cache()

The WARN_ON() check in static function create_cache() is done by its only
parent kmem_cache_create_usercopy() before calling it.
	if (...
	    WARN_ON(size < usersize || size - usersize < useroffset))
		usersize = useroffset = 0;
	...
	s = create_cache(..., size, ..., useroffset, usersize, ...);

Therefore, the WARN_ON() check in create_cache() can be safely removed.

Signed-off-by: Zhen Lei <thunder.leizhen@...wei.com>
---
 mm/slab_common.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/mm/slab_common.c b/mm/slab_common.c
index 40b582a014b8f2f..3069c9095523484 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -210,9 +210,6 @@ static struct kmem_cache *create_cache(const char *name,
 	struct kmem_cache *s;
 	int err;
 
-	if (WARN_ON(useroffset + usersize > object_size))
-		useroffset = usersize = 0;
-
 	err = -ENOMEM;
 	s = kmem_cache_zalloc(kmem_cache, GFP_KERNEL);
 	if (!s)
-- 
2.34.1