linux-kernel - [RESEND RFC PATCH 1/1] linux/mm.h: canonicalize macro PAGE

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Message-ID: <57EA6AE7.7090807@zoho.com>
Date:   Tue, 27 Sep 2016 20:49:43 +0800
From:   zijun_hu <zijun_hu@...o.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org, zijun_hu@....com,
        tj@...nel.org, mingo@...nel.org, rientjes@...gle.com,
        iamjoonsoo.kim@....com, mgorman@...hsingularity.net,
        npiggin@...il.com, mhocko@...nel.org
Subject: [RESEND RFC PATCH 1/1] linux/mm.h: canonicalize macro PAGE_ALIGNED()
 definition

From: zijun_hu <zijun_hu@....com>

macro PAGE_ALIGNED() is prone to cause error because it doesn't follow
convention to parenthesize parameter @addr within macro body, for example
unsigned long *ptr = kmalloc(...); PAGE_ALIGNED(ptr + 16);
for the left parameter of macro IS_ALIGNED(), (unsigned long)(ptr + 16)
is desired but the actual one is (unsigned long)ptr + 16

it is fixed by simply canonicalizing macro PAGE_ALIGNED() definition

Signed-off-by: zijun_hu <zijun_hu@....com>
---
 include/linux/mm.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index ef815b9cd426..ec6818631635 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -126,7 +126,7 @@ extern int overcommit_kbytes_handler(struct ctl_table *, int, void __user *,
 #define PAGE_ALIGN(addr) ALIGN(addr, PAGE_SIZE)
 
 /* test whether an address (unsigned long or pointer) is aligned to PAGE_SIZE */
-#define PAGE_ALIGNED(addr)	IS_ALIGNED((unsigned long)addr, PAGE_SIZE)
+#define PAGE_ALIGNED(addr)	IS_ALIGNED((unsigned long)(addr), PAGE_SIZE)
 
 /*
  * Linux kernel virtual memory manager primitives.
-- 
1.9.1