linux-kernel - [PATCH 1/3] dmaengine: dmatest: use offset_in

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Date:   Sat, 22 Apr 2017 09:18:03 +0800
From:   Geliang Tang <geliangtang@...il.com>
To:     Dan Williams <dan.j.williams@...el.com>,
        Vinod Koul <vinod.koul@...el.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Ingo Molnar <mingo@...nel.org>
Cc:     Geliang Tang <geliangtang@...il.com>, dmaengine@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 1/3] dmaengine: dmatest: use offset_in_page() macro

Use offset_in_page() macro instead of open-coding.

Signed-off-by: Geliang Tang <geliangtang@...il.com>
---
 drivers/dma/dmatest.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/dma/dmatest.c b/drivers/dma/dmatest.c
index 54d581d..d042b2b 100644
--- a/drivers/dma/dmatest.c
+++ b/drivers/dma/dmatest.c
@@ -585,7 +585,7 @@ static int dmatest_func(void *data)
 		for (i = 0; i < src_cnt; i++) {
 			void *buf = thread->srcs[i];
 			struct page *pg = virt_to_page(buf);
-			unsigned pg_off = (unsigned long) buf & ~PAGE_MASK;
+			unsigned long pg_off = offset_in_page(buf);
 
 			um->addr[i] = dma_map_page(dev->dev, pg, pg_off,
 						   um->len, DMA_TO_DEVICE);
@@ -605,7 +605,7 @@ static int dmatest_func(void *data)
 		for (i = 0; i < dst_cnt; i++) {
 			void *buf = thread->dsts[i];
 			struct page *pg = virt_to_page(buf);
-			unsigned pg_off = (unsigned long) buf & ~PAGE_MASK;
+			unsigned long pg_off = offset_in_page(buf);
 
 			dsts[i] = dma_map_page(dev->dev, pg, pg_off, um->len,
 					       DMA_BIDIRECTIONAL);
-- 
2.9.3