Extract clean up of failed munmap() operations from
do_vmi_align_munmap(). This simplifies later patches in the series.
Signed-off-by: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx>
---
mm/mmap.c | 25 ++++++++++++++++++++-----
1 file changed, 20 insertions(+), 5 deletions(-)
diff --git a/mm/mmap.c b/mm/mmap.c
index 4a9929bc18bd..bcfcbe006b1e 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -2545,6 +2545,25 @@ struct vm_area_struct *vma_merge_extend(struct vma_iterator *vmi,
vma->vm_userfaultfd_ctx, anon_vma_name(vma));
}
+/*
+ * abort_munmap_vmas - Undo any munmap work and free resources
+ *
+ * Reattach detached vmas, free up maple tree used to track the vmas.
+ */
+static inline void abort_munmap_vmas(struct ma_state *mas_detach)
+{
+ struct vm_area_struct *vma;
+ int limit;
+
+ limit = mas_detach->index;
+ mas_set(mas_detach, 0);
+ /* Re-attach any detached VMAs */
+ mas_for_each(mas_detach, vma, limit)
+ vma_mark_detached(vma, false);
+
+ __mt_destroy(mas_detach->tree);
+}
+
/*
* do_vmi_align_munmap() - munmap the aligned region from @start to @end.
* @vmi: The vma iterator
@@ -2699,11 +2718,7 @@ do_vmi_align_munmap(struct vma_iterator *vmi, struct vm_area_struct *vma,
userfaultfd_error:
munmap_gather_failed:
end_split_failed:
- mas_set(&mas_detach, 0);
- mas_for_each(&mas_detach, next, end)
- vma_mark_detached(next, false);
-
- __mt_destroy(&mt_detach);
+ abort_munmap_vmas(&mas_detach);
start_split_failed:
map_count_exceeded:
validate_mm(mm);
--
2.43.0
