From 84fd3e1ee395649ac45b7317d44c10b33d0dca79 Mon Sep 17 00:00:00 2001
From: Vernon Yang <vernon2gm@gmail.com>
Date: Wed, 21 Dec 2022 14:00:55 +0800
Subject: [PATCH] maple_tree: use macro MA_ROOT_PARENT instead of number

When you need to compare whether node->parent is parent of the
root node, using macro MA_ROOT_PARENT is easier to understand
and for better readability.

Link: https://lkml.kernel.org/r/20221221060058.609003-5-vernon2gm@gmail.com
Signed-off-by: Vernon Yang <vernon2gm@gmail.com>
Reviewed-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
 lib/maple_tree.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/lib/maple_tree.c b/lib/maple_tree.c
index 506b8fdb5f1b6..4b0575b60a112 100644
--- a/lib/maple_tree.c
+++ b/lib/maple_tree.c
@@ -503,8 +503,7 @@ static inline unsigned int mte_parent_slot(const struct maple_enode *enode)
 {
 	unsigned long val = (unsigned long)mte_to_node(enode)->parent;
 
-	/* Root. */
-	if (val & 1)
+	if (val & MA_ROOT_PARENT)
 		return 0;
 
 	/*