The quilt patch titled
Subject: mm: remove unnecessary write to vma iterator in __vma_adjust()
has been removed from the -mm tree. Its filename was
mm-remove-unnecessary-write-to-vma-iterator-in-__vma_adjust.patch
This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
------------------------------------------------------
From: "Liam R. Howlett" <Liam.Howlett@xxxxxxxxxx>
Subject: mm: remove unnecessary write to vma iterator in __vma_adjust()
Date: Fri, 20 Jan 2023 11:26:35 -0500
If the vma start address is going to change due to an insert, then it is
safe to not write the vma to the tree. The write of the insert vma will
alter the tree as necessary.
Link: https://lkml.kernel.org/r/20230120162650.984577-35-Liam.Howlett@xxxxxxxxxx
Signed-off-by: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/mmap.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
--- a/mm/mmap.c~mm-remove-unnecessary-write-to-vma-iterator-in-__vma_adjust
+++ a/mm/mmap.c
@@ -719,10 +719,12 @@ int __vma_adjust(struct vma_iterator *vm
}
if (start != vma->vm_start) {
- if ((vma->vm_start < start) &&
- (!insert || (insert->vm_end != start))) {
- vma_iter_clear(vmi, vma->vm_start, start);
- VM_WARN_ON(insert && insert->vm_start > vma->vm_start);
+ if (vma->vm_start < start) {
+ if (!insert || (insert->vm_end != start)) {
+ vma_iter_clear(vmi, vma->vm_start, start);
+ vma_iter_set(vmi, start);
+ VM_WARN_ON(insert && insert->vm_start > vma->vm_start);
+ }
} else {
vma_changed = true;
}
_
Patches currently in -mm which might be from Liam.Howlett@xxxxxxxxxx are
