linux-kernel - [RFC 08/11] mm/mmap/vma_merge: rename adj_next to adj

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Date:   Fri, 24 Feb 2023 11:00:19 +0100
From:   Vlastimil Babka <vbabka@...e.cz>
To:     linux-mm@...ck.org, "Liam R. Howlett" <Liam.Howlett@...cle.com>
Cc:     linux-kernel@...r.kernel.org, patches@...ts.linux.dev,
        maple-tree@...ts.infradead.org, Vlastimil Babka <vbabka@...e.cz>
Subject: [RFC 08/11] mm/mmap/vma_merge: rename adj_next to adj_start

The variable 'adj_next' holds the value by which we adjust vm_start of a
vma in variable 'adjust', that's either 'next' or 'mid', so the current
name is inaccurate. Rename it to 'adj_start'.

Signed-off-by: Vlastimil Babka <vbabka@...e.cz>
---
 mm/mmap.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/mm/mmap.c b/mm/mmap.c
index e05bbcaf7b61..8c2bdf9e3f94 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -903,7 +903,7 @@ struct vm_area_struct *vma_merge(struct vma_iterator *vmi, struct mm_struct *mm,
 	bool vma_expanded = false;
 	struct vma_prepare vp;
 	unsigned long vma_end = end;
-	long adj_next = 0;
+	long adj_start = 0;
 	unsigned long vma_start = addr;
 
 	validate_mm(mm);
@@ -971,7 +971,7 @@ struct vm_area_struct *vma_merge(struct vma_iterator *vmi, struct mm_struct *mm,
 				remove = mid;
 			} else {			/* case 5 */
 				adjust = mid;
-				adj_next = (end - mid->vm_start);
+				adj_start = (end - mid->vm_start);
 			}
 		}
 	} else if (merge_next) {
@@ -979,7 +979,7 @@ struct vm_area_struct *vma_merge(struct vma_iterator *vmi, struct mm_struct *mm,
 		if (prev && addr < prev->vm_end) {	/* case 4 */
 			vma_end = addr;
 			adjust = next;
-			adj_next = -(prev->vm_end - addr);
+			adj_start = -(prev->vm_end - addr);
 			err = dup_anon_vma(next, prev);
 		} else {
 			vma = next;			/* case 3 */
@@ -1002,7 +1002,7 @@ struct vm_area_struct *vma_merge(struct vma_iterator *vmi, struct mm_struct *mm,
 	if (vma_iter_prealloc(vmi))
 		return NULL;
 
-	vma_adjust_trans_huge(vma, vma_start, vma_end, adj_next);
+	vma_adjust_trans_huge(vma, vma_start, vma_end, adj_start);
 	init_multi_vma_prep(&vp, vma, adjust, remove, remove2);
 	VM_WARN_ON(vp.anon_vma && adjust && adjust->anon_vma &&
 		   vp.anon_vma != adjust->anon_vma);
@@ -1018,10 +1018,10 @@ struct vm_area_struct *vma_merge(struct vma_iterator *vmi, struct mm_struct *mm,
 	if (vma_expanded)
 		vma_iter_store(vmi, vma);
 
-	if (adj_next) {
-		adjust->vm_start += adj_next;
-		adjust->vm_pgoff += adj_next >> PAGE_SHIFT;
-		if (adj_next < 0) {
+	if (adj_start) {
+		adjust->vm_start += adj_start;
+		adjust->vm_pgoff += adj_start >> PAGE_SHIFT;
+		if (adj_start < 0) {
 			WARN_ON(vma_expanded);
 			vma_iter_store(vmi, next);
 		}
-- 
2.39.2