linux-kernel - [RFC PATCH] mm/zsmalloc: allocate exactly size of struct zs

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Message-Id: <1417260235-32053-1-git-send-email-opensource.ganesh@gmail.com>
Date:	Sat, 29 Nov 2014 19:23:55 +0800
From:	Ganesh Mahendran <opensource.ganesh@...il.com>
To:	minchan@...nel.org, ngupta@...are.org, ddstreet@...e.org
Cc:	akpm@...ux-foundation.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Ganesh Mahendran <opensource.ganesh@...il.com>
Subject: [RFC PATCH] mm/zsmalloc: allocate exactly size of struct zs_pool

In zs_create_pool(), we allocate memory more then sizeof(struct zs_pool)
  ovhd_size = roundup(sizeof(*pool), PAGE_SIZE);

This patch allocate memory of exactly needed size.

Signed-off-by: Ganesh Mahendran <opensource.ganesh@...il.com>
---
 mm/zsmalloc.c |    5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
index 2021df5..4d0a063 100644
--- a/mm/zsmalloc.c
+++ b/mm/zsmalloc.c
@@ -979,12 +979,11 @@ static bool can_merge(struct size_class *prev, int size, int pages_per_zspage)
  */
 struct zs_pool *zs_create_pool(gfp_t flags)
 {
-	int i, ovhd_size;
+	int i;
 	struct zs_pool *pool;
 	struct size_class *prev_class = NULL;
 
-	ovhd_size = roundup(sizeof(*pool), PAGE_SIZE);
-	pool = kzalloc(ovhd_size, GFP_KERNEL);
+	pool = kzalloc(sizeof(*pool), GFP_KERNEL);
 	if (!pool)
 		return NULL;
 
-- 
1.7.9.5

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