The patch titled
Subject: maple_tree: use ma_dead_node() in mte_dead_node()
has been added to the -mm mm-unstable branch. Its filename is
maple_tree-use-ma_dead_node-in-mte_dead_node.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/maple_tree-use-ma_dead_node-in-mte_dead_node.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: I Hsin Cheng <richard120310@xxxxxxxxx>
Subject: maple_tree: use ma_dead_node() in mte_dead_node()
Date: Tue, 11 Feb 2025 15:18:50 +0800
Utilize ma_dead_node() in mte_dead_node(). It can prevent decoding the
maple enode for a second time. Use the "node" to find parent for
comparison.
Link: https://lkml.kernel.org/r/20250211071850.330632-1-richard120310@xxxxxxxxx
Signed-off-by: I Hsin Cheng <richard120310@xxxxxxxxx>
Reviewed-by: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx>
Cc: Ching-Chun (Jim) Huang <jserv@xxxxxxxxxxxxxxxx>
Cc: Shuah khan <skhan@xxxxxxxxxxxxxxxxxxx>
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-use-ma_dead_node-in-mte_dead_node
+++ a/lib/maple_tree.c
@@ -584,13 +584,10 @@ static __always_inline bool ma_dead_node
*/
static __always_inline bool mte_dead_node(const struct maple_enode *enode)
{
- struct maple_node *parent, *node;
+ struct maple_node *node;
node = mte_to_node(enode);
- /* Do not reorder reads from the node prior to the parent check */
- smp_rmb();
- parent = mte_parent(enode);
- return (parent == node);
+ return ma_dead_node(node);
}
/*
_
Patches currently in -mm which might be from richard120310@xxxxxxxxx are
maple_tree-correct-comment-for-mas_start.patch
maple_tree-use-ma_dead_node-in-mte_dead_node.patch
lib-plistc-add-shortcut-for-plist_requeue.patch
