linux/kernel.h: Add ALIGN_DOWN macro
Follow Linux commit ed067d4a859f ("linux/kernel.h: Add ALIGN_DOWN
macro").
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index 87d2d95..04a09eb 100644
--- 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)