The patch titled
Subject: maple_tree: we don't set offset to MAPLE_NODE_SLOTS on error
has been added to the -mm mm-unstable branch. Its filename is
maple_tree-we-dont-set-offset-to-maple_node_slots-on-error.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/maple_tree-we-dont-set-offset-to-maple_node_slots-on-error.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: we don't set offset to MAPLE_NODE_SLOTS on error
Date: Sat, 16 Nov 2024 01:48:05 +0000
When mas_anode_descend() not find gap, it sets -EBUSY instead of setting
offset to MAPLE_NODE_SLOTS.
Link: https://lkml.kernel.org/r/20241116014805.11547-4-richard.weiyang@xxxxxxxxx
Signed-off-by: Wei Yang <richard.weiyang@xxxxxxxxx>
Reviewed-by: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx>
Cc: Lorenzo Stoakes <lorenzo.stoakes@xxxxxxxxxx>
Cc: Sidhartha Kumar <sidhartha.kumar@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
lib/maple_tree.c | 7 ++-----
1 file changed, 2 insertions(+), 5 deletions(-)
--- a/lib/maple_tree.c~maple_tree-we-dont-set-offset-to-maple_node_slots-on-error
+++ a/lib/maple_tree.c
@@ -4999,8 +4999,8 @@ static inline void mas_awalk(struct ma_s
* There are 4 options:
* go to child (descend)
* go back to parent (ascend)
- * no gap found. (return, slot == MAPLE_NODE_SLOTS)
- * found the gap. (return, slot != MAPLE_NODE_SLOTS)
+ * no gap found. (return, error == -EBUSY)
+ * found the gap. (return)
*/
while (!mas_is_err(mas) && !mas_anode_descend(mas, size)) {
if (last == mas->node)
@@ -5085,9 +5085,6 @@ int mas_empty_area(struct ma_state *mas,
return xa_err(mas->node);
offset = mas->offset;
- if (unlikely(offset == MAPLE_NODE_SLOTS))
- return -EBUSY;
-
node = mas_mn(mas);
mt = mte_node_type(mas->node);
pivots = ma_pivots(node, mt);
_
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
