linux-kernel - [PATCH] maple_tree: not necessary to filter MAPLE_PARENT

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Date:   Sun, 13 Nov 2022 00:56:18 +0000
From:   Wei Yang <richard.weiyang@...il.com>
To:     Liam.Howlett@...cle.com
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Wei Yang <richard.weiyang@...il.com>,
        "Liam R . Howlett" <Liam.Howlett@...cle.com>
Subject: [PATCH] maple_tree: not necessary to filter MAPLE_PARENT_ROOT since it is not a root

Root node is return at the beginning, so we are sure bit 0 is not set.

Signed-off-by: Wei Yang <richard.weiyang@...il.com>
CC: Liam R. Howlett <Liam.Howlett@...cle.com>
---
 lib/maple_tree.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/maple_tree.c b/lib/maple_tree.c
index 9aad98c24f3e..f8c4755e7c75 100644
--- a/lib/maple_tree.c
+++ b/lib/maple_tree.c
@@ -436,7 +436,7 @@ enum maple_type mte_parent_enum(struct maple_enode *p_enode,
 		return 0; /* Validated in the caller. */
 
 	p_type &= MAPLE_NODE_MASK;
-	p_type = p_type & ~(MAPLE_PARENT_ROOT | mte_parent_slot_mask(p_type));
+	p_type = p_type & ~mte_parent_slot_mask(p_type);
 
 	switch (p_type) {
 	case MAPLE_PARENT_RANGE64: /* or MAPLE_PARENT_ARANGE64 */
-- 
2.33.1