From: Liam Howlett <Liam.Howlett@oracle.com>
Date: Thu, 24 Nov 2022 15:55:31 +0000 (-0500)
Subject: maple_tree: remove extra smp_wmb() from mas_dead_leaves()
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=838bab4bf4de6250f21d4d1ece658ed52cd86ce9;p=users%2Fjedix%2Flinux-maple.git

maple_tree: remove extra smp_wmb() from mas_dead_leaves()

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>
---

diff --git a/lib/maple_tree.c b/lib/maple_tree.c
index e430f7c73f73..7673d6ecf3e2 100644
--- a/lib/maple_tree.c
+++ b/lib/maple_tree.c
@@ -5505,7 +5505,6 @@ 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);
 	}