diff --git a/mm/mmap.c b/mm/mmap.c
index 042d22e63528..c9834364ac98 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -861,44 +861,44 @@ can_vma_merge_after(struct vm_area_struct *vma, unsigned long vm_flags,
  * this area are about to be changed to vm_flags - and the no-change
  * case has already been eliminated.
  *
- * The following mprotect cases have to be considered, where AAAA is
+ * The following mprotect cases have to be considered, where **** is
  * the area passed down from mprotect_fixup, never extending beyond one
- * vma, PPPP is the previous vma, NNNN is a vma that starts at the same
- * address as AAAA and is of the same or larger span, and XXXX the next
- * vma after AAAA:
+ * vma, PPPP is the previous vma, CCCC is a concurrent vma that starts
+ * at the same address as **** and is of the same or larger span, and
+ * NNNN the next vma after ****:
  *
- *     AAAA             AAAA                   AAAA
- *    PPPPPPXXXXXX    PPPPPPXXXXXX       PPPPPPNNNNNN
+ *     ****             ****                   ****
+ *    PPPPPPNNNNNN    PPPPPPNNNNNN       PPPPPPCCCCCC
  *    cannot merge    might become       might become
- *                    PPXXXXXXXXXX       PPPPPPPPPPNN
+ *                    PPNNNNNNNNNN       PPPPPPPPPPCC
  *    mmap, brk or    case 4 below       case 5 below
  *    mremap move:
- *                        AAAA               AAAA
- *                    PPPP    XXXX       PPPPNNNNXXXX
+ *                        ****               ****
+ *                    PPPP    NNNN       PPPPCCCCNNNN
  *                    might become       might become
  *                    PPPPPPPPPPPP 1 or  PPPPPPPPPPPP 6 or
- *                    PPPPPPPPXXXX 2 or  PPPPPPPPXXXX 7 or
- *                    PPPPXXXXXXXX 3     PPPPXXXXXXXX 8
+ *                    PPPPPPPPNNNN 2 or  PPPPPPPPNNNN 7 or
+ *                    PPPPNNNNNNNN 3     PPPPNNNNNNNN 8
  *
- * It is important for case 8 that the vma NNNN overlapping the
- * region AAAA is never going to extended over XXXX. Instead XXXX must
- * be extended in region AAAA and NNNN must be removed. This way in
+ * It is important for case 8 that the vma CCCC overlapping the
+ * region **** is never going to extended over NNNN. Instead NNNN must
+ * be extended in region **** and CCCC must be removed. This way in
  * all cases where vma_merge succeeds, the moment vma_merge drops the
  * rmap_locks, the properties of the merged vma will be already
  * correct for the whole merged range. Some of those properties like
  * vm_page_prot/vm_flags may be accessed by rmap_walks and they must
  * be correct for the whole merged range immediately after the
- * rmap_locks are released. Otherwise if XXXX would be removed and
- * NNNN would be extended over the XXXX range, remove_migration_ptes
+ * rmap_locks are released. Otherwise if NNNN would be removed and
+ * CCCC would be extended over the NNNN range, remove_migration_ptes
  * or other rmap walkers (if working on addresses beyond the "end"
- * parameter) may establish ptes with the wrong permissions of NNNN
- * instead of the right permissions of XXXX.
+ * parameter) may establish ptes with the wrong permissions of CCCC
+ * instead of the right permissions of NNNN.
  *
  * In the code below:
  * PPPP is represented by *prev
- * NNNN is represented by *mid or not represented at all (NULL)
- * XXXX is represented by *next or not represented at all (NULL)
- * AAAA is not represented - it will be merged and the vma containing the
+ * CCCC is represented by *curr or not represented at all (NULL)
+ * NNNN is represented by *next or not represented at all (NULL)
+ * **** is not represented - it will be merged and the vma containing the
  *      area is returned, or the function will return NULL
  */
 struct vm_area_struct *vma_merge(struct vma_iterator *vmi, struct mm_struct *mm,
@@ -911,7 +911,7 @@ struct vm_area_struct *vma_merge(struct vma_iterator *vmi, struct mm_struct *mm,
 {
 	pgoff_t pglen = (end - addr) >> PAGE_SHIFT;
 	pgoff_t vma_pgoff;
-	struct vm_area_struct *mid, *next, *res = NULL;
+	struct vm_area_struct *curr, *next, *res = NULL;
 	struct vm_area_struct *vma, *adjust, *remove, *remove2;
 	int err = -1;
 	bool merge_prev = false;
@@ -930,19 +930,19 @@ struct vm_area_struct *vma_merge(struct vma_iterator *vmi, struct mm_struct *mm,
 	if (vm_flags & VM_SPECIAL)
 		return NULL;
 
-	mid = find_vma(mm, prev ? prev->vm_end : 0);
-	if (mid && mid->vm_end == end)			/* cases 6, 7, 8 */
-		next = find_vma(mm, mid->vm_end);
+	curr = find_vma(mm, prev ? prev->vm_end : 0);
+	if (curr && curr->vm_end == end)		/* cases 6, 7, 8 */
+		next = find_vma(mm, curr->vm_end);
 	else
-		next = mid;
+		next = curr;
 
-	/* In cases 1 - 4 there's no NNNN vma */
-	if (mid && end <= mid->vm_start)
-		mid = NULL;
+	/* In cases 1 - 4 there's no CCCC vma */
+	if (curr && end <= curr->vm_start)
+		curr = NULL;
 
 	/* verify some invariant that must be enforced by the caller */
 	VM_WARN_ON(prev && addr <= prev->vm_start);
-	VM_WARN_ON(mid && end > mid->vm_end);
+	VM_WARN_ON(curr && end > curr->vm_end);
 	VM_WARN_ON(addr >= end);
 
 	if (prev) {
@@ -974,21 +974,21 @@ struct vm_area_struct *vma_merge(struct vma_iterator *vmi, struct mm_struct *mm,
 		remove = next;				/* case 1 */
 		vma_end = next->vm_end;
 		err = dup_anon_vma(prev, next);
-		if (mid) {				/* case 6 */
-			remove = mid;
+		if (curr) {				/* case 6 */
+			remove = curr;
 			remove2 = next;
 			if (!next->anon_vma)
-				err = dup_anon_vma(prev, mid);
+				err = dup_anon_vma(prev, curr);
 		}
 	} else if (merge_prev) {
 		err = 0;				/* case 2 */
-		if (mid) {
-			err = dup_anon_vma(prev, mid);
-			if (end == mid->vm_end) {	/* case 7 */
-				remove = mid;
+		if (curr) {
+			err = dup_anon_vma(prev, curr);
+			if (end == curr->vm_end) {	/* case 7 */
+				remove = curr;
 			} else {			/* case 5 */
-				adjust = mid;
-				adj_start = (end - mid->vm_start);
+				adjust = curr;
+				adj_start = (end - curr->vm_start);
 			}
 		}
 	} else if (merge_next) {
@@ -1004,10 +1004,10 @@ struct vm_area_struct *vma_merge(struct vma_iterator *vmi, struct mm_struct *mm,
 			vma_end = next->vm_end;
 			vma_pgoff = next->vm_pgoff;
 			err = 0;
-			if (mid) {			/* case 8 */
-				vma_pgoff = mid->vm_pgoff;
-				remove = mid;
-				err = dup_anon_vma(next, mid);
+			if (curr) {			/* case 8 */
+				vma_pgoff = curr->vm_pgoff;
+				remove = curr;
+				err = dup_anon_vma(next, curr);
 			}
 		}
 	}
