Patchwork [6/6] uio: use vma_pages() to replace (vm_end - vm_start) >> PAGE_SHIFT

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Submitter Libin
Date April 15, 2013, 12:48 p.m.
Message ID <1366030138-71292-6-git-send-email-huawei.libin@huawei.com>
Download mbox | patch
Permalink /patch/236590/
State Not Applicable
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Comments

Libin - April 15, 2013, 12:48 p.m.
(*->vm_end - *->vm_start) >> PAGE_SHIFT operation is implemented
as a inline funcion vma_pages() in linux/mm.h, so using it.

Signed-off-by: Libin <huawei.libin@huawei.com>
---
 drivers/uio/uio.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Patch

diff --git a/drivers/uio/uio.c b/drivers/uio/uio.c
index c8b9262..ba5447f 100644
--- a/drivers/uio/uio.c
+++ b/drivers/uio/uio.c
@@ -676,7 +676,7 @@  static int uio_mmap(struct file *filep, struct vm_area_struct *vma)
 	if (mi < 0)
 		return -EINVAL;
 
-	requested_pages = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
+	requested_pages = vma_pages(vma);
 	actual_pages = ((idev->info->mem[mi].addr & ~PAGE_MASK)
 			+ idev->info->mem[mi].size + PAGE_SIZE -1) >> PAGE_SHIFT;
 	if (requested_pages > actual_pages)