linux-kernel - [PATCH 1/2] cma: use macro PFN_DOWN when converting size to pages

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Date:	Mon, 5 Aug 2013 16:31:00 +0800
From:	Xishi Qiu <qiuxishi@...wei.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>
CC:	<linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH 1/2] cma: use macro PFN_DOWN when converting size to pages

Use "PFN_DOWN(r->size)" instead of "r->size >> PAGE_SHIFT".

Signed-off-by: Xishi Qiu <qiuxishi@...wei.com>
---
 drivers/base/dma-contiguous.c |    5 ++---
 1 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/base/dma-contiguous.c b/drivers/base/dma-contiguous.c
index 0ca5442..1bcfaed 100644
--- a/drivers/base/dma-contiguous.c
+++ b/drivers/base/dma-contiguous.c
@@ -201,13 +201,12 @@ static int __init cma_init_reserved_areas(void)
 {
 	struct cma_reserved *r = cma_reserved;
 	unsigned i = cma_reserved_count;
+	struct cma *cma;
 
 	pr_debug("%s()\n", __func__);
 
 	for (; i; --i, ++r) {
-		struct cma *cma;
-		cma = cma_create_area(PFN_DOWN(r->start),
-				      r->size >> PAGE_SHIFT);
+		cma = cma_create_area(PFN_DOWN(r->start), PFN_DOWN(r->size));
 		if (!IS_ERR(cma))
 			dev_set_cma_area(r->dev, cma);
 	}
-- 
1.7.1


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