linux-kernel - [PATCH 1/8] maple_tree: set the node limit when creating a new root node

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Message-Id: <20230615130859.21858-2-zhangpeng.00@bytedance.com>
Date:   Thu, 15 Jun 2023 21:08:52 +0800
From:   Peng Zhang <zhangpeng.00@...edance.com>
To:     Liam.Howlett@...cle.com
Cc:     akpm@...ux-foundation.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, maple-tree@...ts.infradead.org,
        Peng Zhang <zhangpeng.00@...edance.com>
Subject: [PATCH 1/8] maple_tree: set the node limit when creating a new root node

Set the node limit of the root node so that the last pivot of all nodes
is the node limit (if the node is not full).

Signed-off-by: Peng Zhang <zhangpeng.00@...edance.com>
---
 lib/maple_tree.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/maple_tree.c b/lib/maple_tree.c
index 279b871f21a6..23202edb9f1e 100644
--- a/lib/maple_tree.c
+++ b/lib/maple_tree.c
@@ -3692,7 +3692,8 @@ static inline int mas_root_expand(struct ma_state *mas, void *entry)
 	mas->offset = slot;
 	pivots[slot] = mas->last;
 	if (mas->last != ULONG_MAX)
-		slot++;
+		pivots[++slot] = ULONG_MAX;
+
 	mas->depth = 1;
 	mas_set_height(mas);
 	ma_set_meta(node, maple_leaf_64, 0, slot);
-- 
2.20.1