diff mbox series

[v2,04/33] maple_tree: remove extra smp_wmb() from mas_dead_leaves()

Message ID 20230127194110.533103-5-surenb@google.com (mailing list archive)
State New
Headers show
Series Per-VMA locks | expand

Commit Message

Suren Baghdasaryan Jan. 27, 2023, 7:40 p.m. UTC 
From: Liam Howlett <Liam.Howlett@oracle.com>

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.

Fixes: 54a611b60590 ("Maple Tree: add new data structure")
Signed-off-by: Liam Howlett <Liam.Howlett@oracle.com>
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
---
 lib/maple_tree.c | 1 -
 1 file changed, 1 deletion(-)
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Patch

diff --git a/lib/maple_tree.c b/lib/maple_tree.c
index 73917dd2c608..75cce2d4d5da 100644
--- a/lib/maple_tree.c
+++ b/lib/maple_tree.c
@@ -5510,7 +5510,6 @@  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);
 	}