From: "Liam R. Howlett" <Liam.Howlett@Oracle.com>
Date: Tue, 11 Apr 2023 11:10:52 -0400
Subject: [PATCH] maple_tree: remove extra smp_wmb() from mas_dead_leaves()
References: bsc#1012628
Patch-mainline: 6.2.11
Git-commit: 8372f4d83f96f35915106093cde4565836587123
commit 8372f4d83f96f35915106093cde4565836587123 upstream.
The call to mte_set_dead_node() before the smp_wmb() already calls
smp_wmb() so this is not needed. This is an optimization for the RCU mode
of the maple tree.
Link: https://lkml.kernel.org/r/20230227173632.3292573-5-surenb@google.com
Fixes: 54a611b60590 ("Maple Tree: add new data structure")
Cc: stable@vger.kernel.org
Signed-off-by: Liam Howlett <Liam.Howlett@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
lib/maple_tree.c | 1 -
1 file changed, 1 deletion(-)
diff --git a/lib/maple_tree.c b/lib/maple_tree.c
index f7513c54..aeb218f2 100644
--- a/lib/maple_tree.c
+++ b/lib/maple_tree.c
@@ -5500,7 +5500,6 @@ unsigned char mas_dead_leaves(struct ma_state *mas, void __rcu **slots,
break;
mte_set_node_dead(entry);
- smp_wmb(); /* Needed for RCU */
node->type = type;
rcu_assign_pointer(slots[offset], node);
}
--
2.35.3