From faa10555568b65e89b671341399b4bcaced6a149 Mon Sep 17 00:00:00 2001
From: Taylor R Campbell <riastradh@NetBSD.org>
Date: Thu, 31 Mar 2022 02:13:44 +0000
Subject: [PATCH 27/49] linux/llist: Use membar_release and
membar_datadep_consumer.
No need for membar_acquire here! Loads are all data-dependent.
---
sys/external/bsd/drm2/include/linux/llist.h | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/sys/external/bsd/drm2/include/linux/llist.h b/sys/external/bsd/drm2/include/linux/llist.h
index ac096e7d300b..4190392d2ee7 100644
--- a/sys/external/bsd/drm2/include/linux/llist.h
+++ b/sys/external/bsd/drm2/include/linux/llist.h
@@ -70,7 +70,7 @@ llist_add(struct llist_node *node, struct llist_head *head)
do {
first = head->first;
node->next = first;
- membar_exit();
+ membar_release();
} while (atomic_cas_ptr(&head->first, first, node) != first);
return first == NULL;
@@ -96,7 +96,7 @@ llist_del_all(struct llist_head *head)
struct llist_node *first;
first = atomic_swap_ptr(&head->first, NULL);
- membar_enter();
+ membar_datadep_consumer();
return first;
}