linux-kernel - [PATCH] mm/list_lru: Remove redundant NULL check before kfree()

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Message-ID: <20250228141856.730825-1-eleanor15x@gmail.com>
Date: Fri, 28 Feb 2025 22:18:56 +0800
From: Yu-Chun Lin <eleanor15x@...il.com>
To: akpm@...ux-foundation.org
Cc: linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	jserv@...s.ncku.edu.tw,
	visitorckw@...il.com,
	Yu-Chun Lin <eleanor15x@...il.com>,
	kernel test robot <lkp@...el.com>
Subject: [PATCH] mm/list_lru: Remove redundant NULL check before kfree()

The kernel's kfree() documentation states: "If @object is NULL, no
operation is performed." Remove checking for NULL before calling kfree().

Reported-by: kernel test robot <lkp@...el.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202502250720.9ueIb7Xh-lkp@intel.com/
Signed-off-by: Yu-Chun Lin <eleanor15x@...il.com>
---
 mm/list_lru.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/mm/list_lru.c b/mm/list_lru.c
index 7d69434c70e0..7c8fb17d9027 100644
--- a/mm/list_lru.c
+++ b/mm/list_lru.c
@@ -548,8 +548,7 @@ int memcg_list_lru_alloc(struct mem_cgroup *memcg, struct list_lru *lru,
 			}
 			xas_unlock_irqrestore(&xas, flags);
 		} while (xas_nomem(&xas, gfp));
-		if (mlru)
-			kfree(mlru);
+		kfree(mlru);
 	} while (pos != memcg && !css_is_dying(&pos->css));
 
 	return xas_error(&xas);
-- 
2.43.0