+ maple_tree-use-ma_dead_node-in-mte_dead_node.patch added to mm-unstable branch

[Andrew Morton <akpm@linux-foundation.org>]

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@gmail.com>
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@gmail.com
Signed-off-by: I Hsin Cheng <richard120310@gmail.com>
Reviewed-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
Cc: Ching-Chun (Jim) Huang <jserv@ccns.ncku.edu.tw>
Cc: Shuah khan <skhan@linuxfoundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 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@gmail.com 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