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Subject[PATCH] kernel.h: add IS_PTR_ALIGNED() macro
Date
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@socionext.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
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