[PATCH v3 48/48] vma_merge: Set vma iterator to correct position.

Liam Howlett
2023-01-17T02:41:45Z

When merging the previous value, set the vma iterator to the previous
slot. Don't use the vma iterator to get the next/prev so that it is in
the correct position for a write.

Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com>
---
mm/mmap.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/mm/mmap.c b/mm/mmap.c
index bf24c46c3c3f..89109a43f35a 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -935,6 +935,7 @@ struct vm_area_struct *vma_merge(struct vma_iterator *vmi, struct mm_struct *mm,
&& can_vma_merge_after(prev, vm_flags, anon_vma, file,
pgoff, vm_userfaultfd_ctx, anon_name)) {
merge_prev = true;
+ vma_prev(vmi);
}
}
/* Can we merge the successor? */
@@ -1026,9 +1027,6 @@ struct vm_area_struct *vma_merge(struct vma_iterator *vmi, struct mm_struct *mm,
validate_mm(mm);
khugepaged_enter_vma(res, vm_flags);

- if (res)
- vma_iter_set(vmi, end);
-
return res;
}

--
2.35.1