maple_tree: remove extra smp_wmb() from mas_dead_leaves()

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>

diff --git a/lib/maple_tree.c b/lib/maple_tree.c
index 7f451e0..f7c2049 100644 (file)
--- a/lib/maple_tree.c
+++ b/lib/maple_tree.c
@@ -5495,7 +5495,6 @@ 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);
        }