[PATCH v4 02/14] linux/kernel.h: Add PTR_ALIGN_DOWN macro
From: Kishon Vijay Abraham I <hidden>
Date: 2020-05-06 15:14:59
Also in:
linux-devicetree, linux-omap, linux-pci, lkml
Subsystem:
the rest · Maintainer:
Linus Torvalds
Add a macro for aligning down a pointer. This is useful to get an aligned register address when a device allows only word access and doesn't allow half word or byte access. Signed-off-by: Kishon Vijay Abraham I <redacted> --- include/linux/kernel.h | 1 + 1 file changed, 1 insertion(+)
diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index 9b7a8d74a9d6..c3b361b5be54 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h@@ -34,6 +34,7 @@ #define ALIGN_DOWN(x, a) __ALIGN_KERNEL((x) - ((a) - 1), (a)) #define __ALIGN_MASK(x, mask) __ALIGN_KERNEL_MASK((x), (mask)) #define PTR_ALIGN(p, a) ((typeof(p))ALIGN((unsigned long)(p), (a))) +#define PTR_ALIGN_DOWN(p, a) ((typeof(p))ALIGN_DOWN((unsigned long)(p), (a))) #define IS_ALIGNED(x, a) (((x) & ((typeof(x))(a) - 1)) == 0) /* generic data direction definitions */
--
2.17.1
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