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[RFC,05/30] linux/kernel.h: Add PTR_ALIGN_DOWN macro

Message ID 20190604131516.13596-6-kishon@ti.com (mailing list archive)
State New, archived
Delegated to: Bjorn Helgaas
Headers show
Series Add PCIe support to TI's J721E SoC | expand

Commit Message

Kishon Vijay Abraham I June 4, 2019, 1:14 p.m. UTC 
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 <kishon@ti.com>
---
 include/linux/kernel.h | 1 +
 1 file changed, 1 insertion(+)
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Patch

diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index 74b1ee9027f5..f5be987f1f95 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 */