linux-kernel - [PATCH] char: Use vma_pages() to replace (vm_end

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Message-ID: <1368411459-52524-1-git-send-email-huawei.libin@huawei.com>
Date:	Mon, 13 May 2013 10:17:39 +0800
From:	Libin <huawei.libin@...wei.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:	<linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>,
	<guohanjun@...wei.com>, <wangyijing@...wei.com>
Subject: [PATCH] char: Use vma_pages() to replace (vm_end - vm_start) >> PAGE_SHIFT

(*->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@...wei.com>
---
 drivers/char/mspec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/char/mspec.c b/drivers/char/mspec.c
index e1f60f9..f1d7fa4 100644
--- a/drivers/char/mspec.c
+++ b/drivers/char/mspec.c
@@ -267,7 +267,7 @@ mspec_mmap(struct file *file, struct vm_area_struct *vma,
 	if ((vma->vm_flags & VM_WRITE) == 0)
 		return -EPERM;
 
-	pages = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
+	pages = vma_pages(vma);
 	vdata_size = sizeof(struct vma_data) + pages * sizeof(long);
 	if (vdata_size <= PAGE_SIZE)
 		vdata = kzalloc(vdata_size, GFP_KERNEL);
-- 
1.8.2.1


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