linux-kernel - [PATCH 6/6] uio: use vma_pages() to replace (vm_end

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Message-ID: <1366030138-71292-6-git-send-email-huawei.libin@huawei.com>
Date:	Mon, 15 Apr 2013 20:48:58 +0800
From:	Libin <huawei.libin@...wei.com>
To:	Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	David Airlie <airlied@...ux.ie>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	"Hans J. Koch" <hjk@...sjkoch.de>,
	Petr Vandrovec <petr@...drovec.name>,
	Andrew Morton <akpm@...ux-foundation.org>
CC:	Konstantin Khlebnikov <khlebnikov@...nvz.org>,
	Thomas Hellstrom <thellstrom@...are.com>,
	Dave Airlie <airlied@...hat.com>,
	Nadia Yvette Chambers <nyc@...omorphy.com>,
	Jiri Kosina <jkosina@...e.cz>,
	Al Viro <viro@...iv.linux.org.uk>,
	Mel Gorman <mgorman@...e.de>, Hugh Dickins <hughd@...gle.com>,
	Rik van Riel <riel@...hat.com>,
	David Rientjes <rientjes@...gle.com>,
	Michel Lespinasse <walken@...gle.com>,
	<linux-kernel@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>,
	<linux-pci@...r.kernel.org>, <linux-mm@...ck.org>,
	<guohanjun@...wei.com>, <wangyijing@...wei.com>
Subject: [PATCH 6/6] uio: 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/uio/uio.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

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)
-- 
1.8.2.1


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