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Date: Mon, 13 Jul 2020 16:31:29 +0530 From: Kishon Vijay Abraham I <kishon@...com> To: Tom Joseph <tjoseph@...ence.com>, Bjorn Helgaas <bhelgaas@...gle.com>, Rob Herring <robh+dt@...nel.org>, Kishon Vijay Abraham I <kishon@...com>, Lorenzo Pieralisi <lorenzo.pieralisi@....com>, Arnd Bergmann <arnd@...db.de> CC: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, <linux-pci@...r.kernel.org>, <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>, <linux-omap@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org> Subject: [PATCH v7 02/14] linux/kernel.h: Add PTR_ALIGN_DOWN macro 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. Acked-by: Rob Herring <robh@...nel.org> Signed-off-by: Kishon Vijay Abraham I <kishon@...com> --- 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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