Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.36 as permitted sender) client-ip=23.128.96.36;
From:   Peng Zhang <zhangpeng.00@bytedance.com>
To:     Liam.Howlett@oracle.com, corbet@lwn.net, akpm@linux-foundation.org,
        willy@infradead.org, brauner@kernel.org, surenb@google.com,
        michael.christie@oracle.com, mjguzik@gmail.com,
        mathieu.desnoyers@efficios.com, npiggin@gmail.com,
        peterz@infradead.org, oliver.sang@intel.com
Cc:     zhangpeng.00@bytedance.com, maple-tree@lists.infradead.org,
        linux-mm@kvack.org, linux-doc@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org
Subject: [PATCH v3 1/9] maple_tree: Add mt_free_one() and mt_attr() helpers
Date:   Mon, 25 Sep 2023 11:56:09 +0800
Message-Id: <20230925035617.84767-2-zhangpeng.00@bytedance.com>
In-Reply-To: <20230925035617.84767-1-zhangpeng.00@bytedance.com>
References: <20230925035617.84767-1-zhangpeng.00@bytedance.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

Add two helpers:
1. mt_free_one(), used to free a maple node.
2. mt_attr(), used to obtain the attributes of maple tree.

Signed-off-by: Peng Zhang <zhangpeng.00@bytedance.com>
---
 lib/maple_tree.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/lib/maple_tree.c b/lib/maple_tree.c
index b0229271c24e..3fe5652a8c6c 100644
--- a/lib/maple_tree.c
+++ b/lib/maple_tree.c
@@ -165,6 +165,11 @@ static inline int mt_alloc_bulk(gfp_t gfp, size_t size, void **nodes)
 	return kmem_cache_alloc_bulk(maple_node_cache, gfp, size, nodes);
 }
 
+static inline void mt_free_one(struct maple_node *node)
+{
+	kmem_cache_free(maple_node_cache, node);
+}
+
 static inline void mt_free_bulk(size_t size, void __rcu **nodes)
 {
 	kmem_cache_free_bulk(maple_node_cache, size, (void **)nodes);
@@ -205,6 +210,11 @@ static unsigned int mas_mt_height(struct ma_state *mas)
 	return mt_height(mas->tree);
 }
 
+static inline unsigned int mt_attr(struct maple_tree *mt)
+{
+	return mt->ma_flags & ~MT_FLAGS_HEIGHT_MASK;
+}
+
 static inline enum maple_type mte_node_type(const struct maple_enode *entry)
 {
 	return ((unsigned long)entry >> MAPLE_NODE_TYPE_SHIFT) &
@@ -5520,7 +5530,7 @@ void mas_destroy(struct ma_state *mas)
 			mt_free_bulk(count, (void __rcu **)&node->slot[1]);
 			total -= count;
 		}
-		kmem_cache_free(maple_node_cache, node);
+		mt_free_one(ma_mnode_ptr(node));
 		total--;
 	}
 
-- 
2.20.1