linux-kernel - [PATCH] dma-mapping: use offset_in

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Message-Id: <67e50e90bcd2753e83be3edcbb8385c25343b30a.1448115135.git.geliangtang@163.com>
Date:	Sat, 21 Nov 2015 22:14:44 +0800
From:	Geliang Tang <geliangtang@....com>
To:	Marek Szyprowski <m.szyprowski@...sung.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Will Deacon <will.deacon@....com>,
	Arnd Bergmann <arnd@...db.de>,
	Christian Borntraeger <borntraeger@...ibm.com>,
	Robin Murphy <robin.murphy@....com>,
	Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
Cc:	Geliang Tang <geliangtang@....com>, linux-kernel@...r.kernel.org
Subject: [PATCH] dma-mapping: use offset_in_page macro

Use offset_in_page macro instead of (addr & ~PAGE_MASK).

Signed-off-by: Geliang Tang <geliangtang@....com>
---
 include/linux/dma-mapping.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
index 3293f27..c0b27ff 100644
--- a/include/linux/dma-mapping.h
+++ b/include/linux/dma-mapping.h
@@ -131,10 +131,10 @@ static inline dma_addr_t dma_map_single_attrs(struct device *dev, void *ptr,
 	kmemcheck_mark_initialized(ptr, size);
 	BUG_ON(!valid_dma_direction(dir));
 	addr = ops->map_page(dev, virt_to_page(ptr),
-			     (unsigned long)ptr & ~PAGE_MASK, size,
+			     offset_in_page(ptr), size,
 			     dir, attrs);
 	debug_dma_map_page(dev, virt_to_page(ptr),
-			   (unsigned long)ptr & ~PAGE_MASK, size,
+			   offset_in_page(ptr), size,
 			   dir, addr, true);
 	return addr;
 }
-- 
2.5.0


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