linux-kernel - [PATCH] maple_tree: mte_set_full() and mte_clear

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Message-ID: <20221028144520.2776767-1-Liam.Howlett@oracle.com>
Date:   Fri, 28 Oct 2022 14:45:34 +0000
From:   Liam Howlett <liam.howlett@...cle.com>
To:     "maple-tree@...ts.infradead.org" <maple-tree@...ts.infradead.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Andrew Morton <akpm@...ux-foundation.org>
CC:     Liam Howlett <liam.howlett@...cle.com>,
        Lukas Bulwahn <lukas.bulwahn@...il.com>,
        Dan Carpenter <dan.carpenter@...cle.com>
Subject: [PATCH] maple_tree: mte_set_full() and mte_clear_full()
 clang-analyzer clean up

mte_set_full() and mte_clear_full() were incorrectly setting a pointer
to a value without returning a result.  Fix this by returning the
modified pointer to be use as necessary.  Also add a third function to
return if the bit is set or not.

Link: https://lore.kernel.org/lkml/20221026120029.12555-1-lukas.bulwahn@gmail.com/
Suggested-by: Lukas Bulwahn <lukas.bulwahn@...il.com>
Suggested-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Liam R. Howlett <Liam.Howlett@...cle.com>
---
 lib/maple_tree.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/lib/maple_tree.c b/lib/maple_tree.c
index 4b3d16ced024..a4416277581b 100644
--- a/lib/maple_tree.c
+++ b/lib/maple_tree.c
@@ -323,14 +323,19 @@ static inline void *mte_safe_root(const struct maple_enode *node)
 	return (void *)((unsigned long)node & ~MAPLE_ROOT_NODE);
 }
 
-static inline void mte_set_full(const struct maple_enode *node)
+static inline void *mte_set_full(const struct maple_enode *node)
 {
-	node = (void *)((unsigned long)node & ~MAPLE_ENODE_NULL);
+	return (void *)((unsigned long)node & ~MAPLE_ENODE_NULL);
 }
 
-static inline void mte_clear_full(const struct maple_enode *node)
+static inline void *mte_clear_full(const struct maple_enode *node)
 {
-	node = (void *)((unsigned long)node | MAPLE_ENODE_NULL);
+	return (void *)((unsigned long)node | MAPLE_ENODE_NULL);
+}
+
+static inline bool mte_has_null(const struct maple_enode *node)
+{
+	return (unsigned long)node & MAPLE_ENODE_NULL;
 }
 
 static inline bool ma_is_root(struct maple_node *node)
-- 
2.35.1