The patch titled
Subject: mm/mmap/vma_merge: initialize mid and next in natural order
has been added to the -mm mm-unstable branch. Its filename is
mm-mmap-vma_merge-initialize-mid-and-next-in-natural-order.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-mmap-vma_merge-initialize-mid-and-next-in-natural-order.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Vlastimil Babka <vbabka@xxxxxxx>
Subject: mm/mmap/vma_merge: initialize mid and next in natural order
Date: Thu, 9 Mar 2023 12:12:53 +0100
It is more intuitive to go from prev to mid and then next. No functional
change.
Link: https://lkml.kernel.org/r/20230309111258.24079-6-vbabka@xxxxxxx
Signed-off-by: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx>
Cc: Lorenzo Stoakes <lstoakes@xxxxxxxxx>
Cc: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Cc: Suren Baghdasaryan <surenb@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/mmap.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)
--- a/mm/mmap.c~mm-mmap-vma_merge-initialize-mid-and-next-in-natural-order
+++ a/mm/mmap.c
@@ -925,10 +925,11 @@ struct vm_area_struct *vma_merge(struct
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);
_
Patches currently in -mm which might be from vbabka@xxxxxxx are
mm-page_alloc-reduce-page-alloc-free-sanity-checks.patch
mm-mmap-vma_merge-use-only-primary-pointers-for-preparing-merge.patch
mm-mmap-vma_merge-use-the-proper-vma-pointer-in-case-3.patch
mm-mmap-vma_merge-use-the-proper-vma-pointers-in-cases-1-and-6.patch
mm-mmap-vma_merge-use-the-proper-vma-pointer-in-case-4.patch
mm-mmap-vma_merge-initialize-mid-and-next-in-natural-order.patch
mm-mmap-vma_merge-set-mid-to-null-if-not-applicable.patch
mm-mmap-vma_merge-rename-adj_next-to-adj_start.patch
mm-mmap-vma_merge-convert-mergeability-checks-to-return-bool.patch
mm-mmap-start-distinguishing-if-vma-can-be-removed-in-mergeability-test.patch
mm-mremap-simplify-vma-expansion-again.patch
