mm,hugetlb: make unmap_ref_private() return void

This function always returns 1, thus no need to check return value in
hugetlb_cow().  By doing so, we can get rid of the unnecessary WARN_ON
call.  While this logic perhaps existed as a way of identifying future
unmap_ref_private() mishandling, reality is it serves no apparent
purpose.
Signed-off-by: Davidlohr Bueso <davidlohr@hp.com>
Cc: Aswin Chandramouleeswaran <aswin@hp.com>
Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

mm/hugetlb.c

@@ -2754,7 +2754,7 @@ void unmap_hugepage_range(struct vm_area_struct *vma, unsigned long start,
  * from other VMAs and let the children be SIGKILLed if they are faulting the
  * same region.
  */
-static int unmap_ref_private(struct mm_struct *mm, struct vm_area_struct *vma,
+static void unmap_ref_private(struct mm_struct *mm, struct vm_area_struct *vma,
 			      struct page *page, unsigned long address)
 {
 	struct hstate *h = hstate_vma(vma);
@@ -2794,8 +2794,6 @@ static int unmap_ref_private(struct mm_struct *mm, struct vm_area_struct *vma,
 					     address + huge_page_size(h), page);
 	}
 	mutex_unlock(&mapping->i_mmap_mutex);
-
-	return 1;
 }
 
 /*
@@ -2857,7 +2855,7 @@ static int hugetlb_cow(struct mm_struct *mm, struct vm_area_struct *vma,
 		 */
 		if (outside_reserve) {
 			BUG_ON(huge_pte_none(pte));
-			if (unmap_ref_private(mm, vma, old_page, address)) {
+			unmap_ref_private(mm, vma, old_page, address);
 			BUG_ON(huge_pte_none(pte));
 			spin_lock(ptl);
 			ptep = huge_pte_offset(mm, address & huge_page_mask(h));
@@ -2870,8 +2868,6 @@ static int hugetlb_cow(struct mm_struct *mm, struct vm_area_struct *vma,
 			 */
 			return 0;
 		}
-			WARN_ON_ONCE(1);
-		}
 
 		/* Caller expects lock to be held */
 		spin_lock(ptl);