linux-kernel - [PATCH] kasan: use IS_ALIGNED in memory_is_poisoned

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Date:	Fri, 11 Sep 2015 10:02:29 +0800
From:	Xishi Qiu <qiuxishi@...wei.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Andrey Konovalov <adech.fo@...il.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Michal Marek <mmarek@...e.cz>,
	"long.wanglong" <long.wanglong@...wei.com>
CC:	Linux MM <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH] kasan: use IS_ALIGNED in memory_is_poisoned_8()

Use IS_ALIGNED() to determine whether the shadow span two bytes.
It generates less code and more readable.

Signed-off-by: Xishi Qiu <qiuxishi@...wei.com>
---
 mm/kasan/kasan.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/kasan/kasan.c b/mm/kasan/kasan.c
index 7b28e9c..c6ddff1 100644
--- a/mm/kasan/kasan.c
+++ b/mm/kasan/kasan.c
@@ -120,7 +120,7 @@ static __always_inline bool memory_is_poisoned_8(unsigned long addr)
 		if (memory_is_poisoned_1(addr + 7))
 			return true;
 
-		if (likely(((addr + 7) & KASAN_SHADOW_MASK) >= 7))
+		if (likely(IS_ALIGNED(addr, 8)))
 			return false;
 
 		return unlikely(*(u8 *)shadow_addr);
-- 
2.0.0


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