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maple_tree: remove extra smp_wmb() from mas_dead_leaves()

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commit 8372f4d83f 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: 54a611b605 ("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>
This commit is contained in:
Liam R. Howlett 2023-04-11 11:10:52 -04:00 committed by Greg Kroah-Hartman
parent cc2f2507f3
commit d3af5f8a50
1 changed files with 0 additions and 1 deletions
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lib/maple_tree.c
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@ -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);
}