linux/kernel.h: Add ALIGN_DOWN macro

Follow Linux commit ed067d4a859f ("linux/kernel.h: Add ALIGN_DOWN
macro").

Signed-off-by: Masahiro Yamada <[email protected]>

diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index 87d2d9554dbb7947aeb9aa61cf9cb437765bdcdd..04a09eb4f6489496417a49db41e5586172753019 100644 (file)
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -38,6 +38,7 @@
 #define REPEAT_BYTE(x) ((~0ul / 0xff) * (x))
 
 #define ALIGN(x,a)             __ALIGN_MASK((x),(typeof(x))(a)-1)
+#define ALIGN_DOWN(x, a)       ALIGN((x) - ((a) - 1), (a))
 #define __ALIGN_MASK(x,mask)   (((x)+(mask))&~(mask))
 #define PTR_ALIGN(p, a)                ((typeof(p))ALIGN((unsigned long)(p), (a)))
 #define IS_ALIGNED(x, a)               (((x) & ((typeof(x))(a) - 1)) == 0)