The patch titled
Subject: maple_tree: Fix potential insufficient nodes on mas_spanning_rebalance()
has been added to the -mm tree. Its filename is
maple-tree-add-new-data-structure-fix-2.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/maple-tree-add-new-data-structure-fix-2.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/maple-tree-add-new-data-structure-fix-2.patch
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------------------------------------------------------
From: "Liam R. Howlett" <Liam.Howlett@xxxxxxxxxx>
Subject: maple_tree: Fix potential insufficient nodes on mas_spanning_rebalance()
When a spanning store occurs at a non-root node but causes an insufficient
leave, mas_spanning_rebalance() was not detecting it as a non-root node.
This only happened when the spanning write was detected at the root node.
Link: https://lkml.kernel.org/r/20220420134737.yuhkl6znauwpp7j5@revolver
Signed-off-by: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
lib/maple_tree.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/lib/maple_tree.c~maple-tree-add-new-data-structure-fix-2
+++ a/lib/maple_tree.c
@@ -2894,7 +2894,7 @@ static int mas_spanning_rebalance(struct
mast->free = &free;
mast->destroy = &destroy;
l_mas.node = r_mas.node = m_mas.node = MAS_NONE;
- if (!mas_is_root_limits(mas) &&
+ if (!mas_is_root_limits(mast->orig_l) &&
unlikely(mast->bn->b_end <= mt_min_slots[mast->bn->type])) {
/*
* Do not free the current node as it may be freed in a bulk
_
Patches currently in -mm which might be from Liam.Howlett@xxxxxxxxxx are
maple-tree-add-new-data-structure-fix-2.patch
