linux-kernel - [RFC 06/11] mm/mmap/vma_merge: initialize mid and next in natural order

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Date:   Fri, 24 Feb 2023 11:00:17 +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 06/11] mm/mmap/vma_merge: initialize mid and next in natural order

It is more intuitive to go from prev to mid and then next. No functional
change.

Signed-off-by: Vlastimil Babka <vbabka@...e.cz>
---
 mm/mmap.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/mm/mmap.c b/mm/mmap.c
index 1e4be7174964..e7d497237f44 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -912,10 +912,11 @@ struct vm_area_struct *vma_merge(struct vma_iterator *vmi, struct mm_struct *mm,
 	if (vm_flags & VM_SPECIAL)
 		return NULL;
 
-	next = find_vma(mm, prev ? prev->vm_end : 0);
-	mid = next;
-	if (next && next->vm_end == end)		/* cases 6, 7, 8 */
-		next = find_vma(mm, next->vm_end);
+	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);
+	else
+		next = mid;
 
 	/* verify some invariant that must be enforced by the caller */
 	VM_WARN_ON(prev && addr <= prev->vm_start);
-- 
2.39.2