From: Xishi Qiu <qiuxishi@huawei.com>
To: Andrew Morton <akpm@linux-foundation.org>,
Andrey Konovalov <adech.fo@gmail.com>,
Rusty Russell <rusty@rustcorp.com.au>,
Michal Marek <mmarek@suse.cz>,
"long.wanglong" <long.wanglong@huawei.com>
Cc: Linux MM <linux-mm@kvack.org>, LKML <linux-kernel@vger.kernel.org>
Subject: [PATCH] kasan: use IS_ALIGNED in memory_is_poisoned_8()
Date: Fri, 11 Sep 2015 10:02:29 +0800 [thread overview]
Message-ID: <55F23635.1010109@huawei.com> (raw)
Use IS_ALIGNED() to determine whether the shadow span two bytes.
It generates less code and more readable.
Signed-off-by: Xishi Qiu <qiuxishi@huawei.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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WARNING: multiple messages have this Message-ID (diff)
From: Xishi Qiu <qiuxishi@huawei.com>
To: Andrew Morton <akpm@linux-foundation.org>,
Andrey Konovalov <adech.fo@gmail.com>,
Rusty Russell <rusty@rustcorp.com.au>,
Michal Marek <mmarek@suse.cz>,
"long.wanglong" <long.wanglong@huawei.com>
Cc: Linux MM <linux-mm@kvack.org>, LKML <linux-kernel@vger.kernel.org>
Subject: [PATCH] kasan: use IS_ALIGNED in memory_is_poisoned_8()
Date: Fri, 11 Sep 2015 10:02:29 +0800 [thread overview]
Message-ID: <55F23635.1010109@huawei.com> (raw)
Use IS_ALIGNED() to determine whether the shadow span two bytes.
It generates less code and more readable.
Signed-off-by: Xishi Qiu <qiuxishi@huawei.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
next reply other threads:[~2015-09-11 2:07 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-11 2:02 Xishi Qiu [this message]
2015-09-11 2:02 ` [PATCH] kasan: use IS_ALIGNED in memory_is_poisoned_8() Xishi Qiu
2015-09-11 22:47 ` Andrew Morton
2015-09-11 22:47 ` Andrew Morton
2015-09-14 1:17 ` Xishi Qiu
2015-09-14 1:17 ` Xishi Qiu
2015-09-14 13:19 ` Andrey Ryabinin
2015-09-14 13:19 ` Andrey Ryabinin
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