linux-kernel - [PATCH] kernel.h: add IS_PTR

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Message-Id: <1490782930-30429-1-git-send-email-yamada.masahiro@socionext.com>
Date:   Wed, 29 Mar 2017 19:22:10 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Niklas Söderlund 
        <niklas.soderlund+renesas@...natech.se>,
        Jessica Yu <jeyu@...hat.com>,
        Johannes Berg <johannes.berg@...el.com>,
        Petr Mladek <pmladek@...e.com>,
        Larry Finger <Larry.Finger@...inger.net>,
        linux-kernel@...r.kernel.org,
        Gustavo Padovan <gustavo.padovan@...labora.co.uk>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Peter Zijlstra <peterz@...radead.org>,
        Luis de Bethencourt <luisbg@....samsung.com>,
        Josh Triplett <josh@...htriplett.org>
Subject: [PATCH] kernel.h: add IS_PTR_ALIGNED() macro

We often check if a pointer has a specific alignment.  Because the
'&' (bitwise AND) operator cannot take a pointer for the operand,
so we need a cast like, IS_ALIGNED((unsigned long)p, a).

IS_PTR_ALIGNED will be useful as a shorthand.

Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
---

 include/linux/kernel.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index e5edd55..a810e4b 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -50,6 +50,7 @@
 #define __ALIGN_MASK(x, mask)	__ALIGN_KERNEL_MASK((x), (mask))
 #define PTR_ALIGN(p, a)		((typeof(p))ALIGN((unsigned long)(p), (a)))
 #define IS_ALIGNED(x, a)		(((x) & ((typeof(x))(a) - 1)) == 0)
+#define IS_PTR_ALIGNED(p, a)		(IS_ALIGNED((unsigned long)p, a))
 
 /* generic data direction definitions */
 #define READ			0
-- 
2.7.4