[PATCH] virt/kvm/kvm_main.c: use vma_pages() helper

[Zhongjun Tan]

From: Tan Zhongjun <tanzhongjun@xxxxxxxxxx>

Use vma_pages function on vma object instead of explicit computation.
./virt/kvm/kvm_main.c:3247:29-35: WARNING: Consider using vma_pages helper on vma

Signed-off-by: Tan Zhongjun <tanzhongjun@xxxxxxxxxx>
---
 virt/kvm/kvm_main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 6b4feb92dc79..1ac52cd1111d 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -3244,7 +3244,7 @@ static const struct vm_operations_struct kvm_vcpu_vm_ops = {
 static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
 {
 	struct kvm_vcpu *vcpu = file->private_data;
-	unsigned long pages = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
+	unsigned long pages = vma_pages(vma);
 
 	if ((kvm_page_in_dirty_ring(vcpu->kvm, vma->vm_pgoff) ||
 	     kvm_page_in_dirty_ring(vcpu->kvm, vma->vm_pgoff + pages - 1)) &&
-- 
2.17.1