linux-kernel - [PATCH 3/3] dma-debug: use offset_in

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Date:   Sat, 22 Apr 2017 09:18:05 +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 3/3] dma-debug: use offset_in_page() macro

Use offset_in_page() macro instead of open-coding.

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

diff --git a/lib/dma-debug.c b/lib/dma-debug.c
index b157b46..cd5a5a4 100644
--- a/lib/dma-debug.c
+++ b/lib/dma-debug.c
@@ -1502,7 +1502,7 @@ void debug_dma_alloc_coherent(struct device *dev, size_t size,
 	entry->type      = dma_debug_coherent;
 	entry->dev       = dev;
 	entry->pfn	 = page_to_pfn(virt_to_page(virt));
-	entry->offset	 = (size_t) virt & ~PAGE_MASK;
+	entry->offset	 = offset_in_page(virt);
 	entry->size      = size;
 	entry->dev_addr  = dma_addr;
 	entry->direction = DMA_BIDIRECTIONAL;
@@ -1518,7 +1518,7 @@ void debug_dma_free_coherent(struct device *dev, size_t size,
 		.type           = dma_debug_coherent,
 		.dev            = dev,
 		.pfn		= page_to_pfn(virt_to_page(virt)),
-		.offset		= (size_t) virt & ~PAGE_MASK,
+		.offset		= offset_in_page(virt),
 		.dev_addr       = addr,
 		.size           = size,
 		.direction      = DMA_BIDIRECTIONAL,
-- 
2.9.3