From: "Liam R. Howlett" Liam.Howlett@Oracle.com
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 --- lib/maple_tree.c | 1 - 1 file changed, 1 deletion(-)
--- a/lib/maple_tree.c +++ b/lib/maple_tree.c @@ -5495,7 +5495,6 @@ unsigned char mas_dead_leaves(struct ma_ break;
mte_set_node_dead(entry); - smp_wmb(); /* Needed for RCU */ node->type = type; rcu_assign_pointer(slots[offset], node); }