linux-kernel - [PATCH] mm/slub.c: freelist is ensured to be NULL when new

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Message-Id: <20181229062512.30469-1-rocking@whu.edu.cn>
Date:   Sat, 29 Dec 2018 14:25:12 +0800
From:   Peng Wang <rocking@....edu.cn>
To:     cl@...ux.com, penberg@...nel.org, rientjes@...gle.com,
        iamjoonsoo.kim@....com, akpm@...ux-foundation.org
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Peng Wang <rocking@....edu.cn>
Subject: [PATCH] mm/slub.c: freelist is ensured to be NULL when new_slab() fails

new_slab_objects() will return immediately if freelist is not NULL.

         if (freelist)
                 return freelist;

One more assignment operation could be avoided.

Signed-off-by: Peng Wang <rocking@....edu.cn>
---
 mm/slub.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/mm/slub.c b/mm/slub.c
index 36c0befeebd8..cf2ef4ababff 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -2463,8 +2463,7 @@ static inline void *new_slab_objects(struct kmem_cache *s, gfp_t flags,
 		stat(s, ALLOC_SLAB);
 		c->page = page;
 		*pc = c;
-	} else
-		freelist = NULL;
+	}
 
 	return freelist;
 }
-- 
2.19.1