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authorLibin <huawei.libin@huawei.com>2013-05-13 10:17:39 +0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-05-21 10:07:54 -0700
commita0ea59d56dfab021ecc65365275e532c6b937adb (patch)
treefc14ad5175bb30089aea6591a732b4a750faf58f /drivers/char/mspec.c
parent80fe6361540fd7e0a38326b02b4f2a5e68c99d0a (diff)
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@huawei.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/char/mspec.c')
-rw-r--r--drivers/char/mspec.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/char/mspec.c b/drivers/char/mspec.c
index e1f60f968fdd..f1d7fa45c275 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);