(*->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@xxxxxxxxxx> --- 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 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>