[PATCH V2] cma: use macro PFN_DOWN when converting size to pages

[Xishi Qiu]

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

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

diff --git a/drivers/base/dma-contiguous.c b/drivers/base/dma-contiguous.c
index 0ca5442..b3d711d 100644
--- a/drivers/base/dma-contiguous.c
+++ b/drivers/base/dma-contiguous.c
@@ -206,8 +206,7 @@ static int __init cma_init_reserved_areas(void)
 
        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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