linux-kernel - [PATCH] maple_tree: Use ma_dead_node() in mte_dead

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Message-ID: <20250211071850.330632-1-richard120310@gmail.com>
Date: Tue, 11 Feb 2025 15:18:50 +0800
From: I Hsin Cheng <richard120310@...il.com>
To: Liam.Howlett@...cle.com
Cc: akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org,
	maple-tree@...ts.infradead.org,
	linux-mm@...ck.org,
	jserv@...s.ncku.edu.tw,
	skhan@...uxfoundation.org,
	I Hsin Cheng <richard120310@...il.com>
Subject: [PATCH] maple_tree: Use ma_dead_node() in mte_dead_node()

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.

Signed-off-by: I Hsin Cheng <richard120310@...il.com>
---
 lib/maple_tree.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/lib/maple_tree.c b/lib/maple_tree.c
index f7153ade1be5..362f85c62678 100644
--- a/lib/maple_tree.c
+++ b/lib/maple_tree.c
@@ -584,13 +584,10 @@ static __always_inline bool ma_dead_node(const struct maple_node *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);
 }
 
 /*
-- 
2.43.0