linux-kernel - [PATCH] xen/gntdev: use vma

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Message-Id: <1463836161-16524-2-git-send-email-falakreyaz@gmail.com>
Date:	Sat, 21 May 2016 18:39:20 +0530
From:	Muhammad Falak R Wani <falakreyaz@...il.com>
To:	Boris Ostrovsky <boris.ostrovsky@...cle.com>
Cc:	David Vrabel <david.vrabel@...rix.com>,
	Juergen Gross <jgross@...e.com>,
	xen-devel@...ts.xenproject.org (moderated list:XEN HYPERVISOR INTERFACE),
	linux-kernel@...r.kernel.org (open list)
Subject: [PATCH] xen/gntdev: use vma_pages().

Replace explicit computation of vma page count by a call to
vma_pages()

Signed-off-by: Muhammad Falak R Wani <falakreyaz@...il.com>
---
 drivers/xen/gntdev.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/xen/gntdev.c b/drivers/xen/gntdev.c
index 6793957..bb95212 100644
--- a/drivers/xen/gntdev.c
+++ b/drivers/xen/gntdev.c
@@ -982,7 +982,7 @@ static int gntdev_mmap(struct file *flip, struct vm_area_struct *vma)
 {
 	struct gntdev_priv *priv = flip->private_data;
 	int index = vma->vm_pgoff;
-	int count = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
+	int count = vma_pages(vma);
 	struct grant_map *map;
 	int i, err = -EINVAL;
 
-- 
1.9.1