mm/khugepaged: use vma_is_anonymous

Clean up the vma->vm_ops usage.  Use vma_is_anonymous instead of
vma->vm_ops to make it more understandable.

Link: https://lkml.kernel.org/r/20220424071642.3234971-1-xu.xin16@zte.com.cnSigned-off-by: Nxu xin <xu.xin16@zte.com.cn>
Reviewed-by: NYang Shi <shy828301@gmail.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>

mm/khugepaged.c

@@ -466,7 +466,7 @@ static bool hugepage_vma_check(struct vm_area_struct *vma,
 			S_ISREG(inode->i_mode);
 	}
 
-	if (!vma->anon_vma || vma->vm_ops)
+	if (!vma->anon_vma || !vma_is_anonymous(vma))
 		return false;
 	if (vma_is_temporary_stack(vma))
 		return false;
@@ -972,7 +972,7 @@ static int hugepage_vma_revalidate(struct mm_struct *mm, unsigned long address,
 	if (!hugepage_vma_check(vma, vma->vm_flags))
 		return SCAN_VMA_CHECK;
 	/* Anon VMA expected */
-	if (!vma->anon_vma || vma->vm_ops)
+	if (!vma->anon_vma || !vma_is_anonymous(vma))
 		return SCAN_VMA_CHECK;
 	return 0;
 }