linux-kernel - [PATCH 6.1 08/14] maple_tree: refine ma_state init from mas

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Date:   Tue, 11 Apr 2023 11:10:49 -0400
From:   "Liam R. Howlett" <Liam.Howlett@...cle.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org
Cc:     maple-tree@...ts.infradead.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        "Liam R. Howlett" <Liam.Howlett@...cle.com>,
        Stable@...r.kernel.org, Vernon Yang <vernon2gm@...il.com>,
        "Liam R . Howlett" <Liam.Howlett@...cle.com>
Subject: [PATCH 6.1 08/14] maple_tree: refine ma_state init from mas_start()

From: "Liam R. Howlett" <Liam.Howlett@...cle.com>

commit 46b345848261009477552d654cb2f65000c30e4d upstream.

If mas->node is an MAS_START, there are three cases, and they all assign
different values to mas->node and mas->offset.  So there is no need to set
them to a default value before updating.

Update them directly to make them easier to understand and for better
readability.

Link: https://lkml.kernel.org/r/20221221060058.609003-7-vernon2gm@gmail.com
Cc: <Stable@...r.kernel.org>
Fixes: 54a611b60590 ("Maple Tree: add new data structure")
Signed-off-by: Vernon Yang <vernon2gm@...il.com>
Signed-off-by: Liam R. Howlett <Liam.Howlett@...cle.com>
---
 lib/maple_tree.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/lib/maple_tree.c b/lib/maple_tree.c
index 7c8225e7df13..194963149c2d 100644
--- a/lib/maple_tree.c
+++ b/lib/maple_tree.c
@@ -1334,7 +1334,7 @@ static void mas_node_count(struct ma_state *mas, int count)
  * mas_start() - Sets up maple state for operations.
  * @mas: The maple state.
  *
- * If mas->node == MAS_START, then set the min, max, depth, and offset to
+ * If mas->node == MAS_START, then set the min, max and depth to
  * defaults.
  *
  * Return:
@@ -1348,22 +1348,22 @@ static inline struct maple_enode *mas_start(struct ma_state *mas)
 	if (likely(mas_is_start(mas))) {
 		struct maple_enode *root;
 
-		mas->node = MAS_NONE;
 		mas->min = 0;
 		mas->max = ULONG_MAX;
 		mas->depth = 0;
-		mas->offset = 0;
 
 		root = mas_root(mas);
 		/* Tree with nodes */
 		if (likely(xa_is_node(root))) {
 			mas->depth = 1;
 			mas->node = mte_safe_root(root);
+			mas->offset = 0;
 			return NULL;
 		}
 
 		/* empty tree */
 		if (unlikely(!root)) {
+			mas->node = MAS_NONE;
 			mas->offset = MAPLE_NODE_SLOTS;
 			return NULL;
 		}
-- 
2.39.2