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 <[email protected]> --- 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
