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mm: remove unnecessary write to vma iterator in __vma_adjust()

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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@oracle.com
Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Liam R. Howlett 2023-01-20 11:26:35 -05:00 committed by Andrew Morton
parent 85ab779e34
commit c465be97a4
1 changed files with 6 additions and 4 deletions
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10
mm/mmap.c
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@ -719,10 +719,12 @@ int __vma_adjust(struct vma_iterator *vmi, struct vm_area_struct *vma,
}
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;
}