The patch titled
Subject: maple_tree: only root node could be deficient
has been added to the -mm mm-unstable branch. Its filename is
maple_tree-only-root-node-could-be-deficient.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/maple_tree-only-root-node-could-be-deficient.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Wei Yang <richard.weiyang@xxxxxxxxx>
Subject: maple_tree: only root node could be deficient
Date: Wed, 13 Nov 2024 03:16:16 +0000
Each level's rightmost node should have (max == ULONG_MAX). This means
current validation skips the right most node on each level.
Only the root node may be below the minimum data threshold.
Link: https://lkml.kernel.org/r/20241113031616.10530-4-richard.weiyang@xxxxxxxxx
Signed-off-by: Wei Yang <richard.weiyang@xxxxxxxxx>
Reviewed-by: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx>
Cc: Sidhartha Kumar <sidhartha.kumar@xxxxxxxxxx>
Cc: Lorenzo Stoakes <lorenzo.stoakes@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-only-root-node-could-be-deficient
+++ a/lib/maple_tree.c
@@ -7555,7 +7555,7 @@ void mt_validate(struct maple_tree *mt)
MAS_WARN_ON(&mas, mte_dead_node(mas.node));
end = mas_data_end(&mas);
if (MAS_WARN_ON(&mas, (end < mt_min_slot_count(mas.node)) &&
- (mas.max != ULONG_MAX))) {
+ (!mte_is_root(mas.node)))) {
pr_err("Invalid size %u of " PTR_FMT "\n",
end, mas_mn(&mas));
}
_
Patches currently in -mm which might be from richard.weiyang@xxxxxxxxx are
maple_tree-use-mas_next_slot-directly.patch
maple_tree-index-has-been-checked-to-be-smaller-than-pivot.patch
maple_tree-not-possible-to-be-a-root-node-after-loop.patch
maple_tree-we-dont-set-offset-to-maple_node_slots-on-error.patch
maple_tree-simplify-split-calculation.patch
maple_tree-add-a-test-check-deficient-node.patch
maple_tree-only-root-node-could-be-deficient.patch
