Author: hselasky
Date: Tue Oct 13 16:19:21 2020
New Revision: 366669
URL: https://svnweb.freebsd.org/changeset/base/366669
Log:
Implement more RCU list functions in the LinuxKPI.
This also fixes a bug in the existing list_add_rcu() where the
prev->prev pointer was updated to the new element instead of
next->prev. Currently this function is not widely used.
MFC after: 1 week
Sponsored by: Mellanox Technologies // NVIDIA Networking
Modified:
head/sys/compat/linuxkpi/common/include/linux/rculist.h
Modified: head/sys/compat/linuxkpi/common/include/linux/rculist.h
==============================================================================
--- head/sys/compat/linuxkpi/common/include/linux/rculist.h Tue Oct 13
14:10:49 2020 (r366668)
+++ head/sys/compat/linuxkpi/common/include/linux/rculist.h Tue Oct 13
16:19:21 2020 (r366669)
@@ -1,6 +1,6 @@
/*-
* Copyright (c) 2015 François Tigeot
- * Copyright (c) 2016-2017 Mellanox Technologies, Ltd.
+ * Copyright (c) 2016-2020 Mellanox Technologies, Ltd.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@@ -37,6 +37,7 @@
container_of(READ_ONCE(ptr), type, member)
#define list_next_rcu(head) (*((struct list_head
**)(&(head)->next)))
+#define list_prev_rcu(head) (*((struct list_head
**)(&(head)->prev)))
#define list_for_each_entry_rcu(pos, head, member) \
for (pos = list_entry_rcu((head)->next, typeof(*(pos)), member); \
@@ -44,12 +45,44 @@
pos = list_entry_rcu((pos)->member.next, typeof(*(pos)), member))
static inline void
-list_add_rcu(struct list_head *new, struct list_head *prev)
+linux_list_add_rcu(struct list_head *new, struct list_head *prev,
+ struct list_head *next)
{
- new->next = prev->next;
+ new->next = next;
new->prev = prev;
rcu_assign_pointer(list_next_rcu(prev), new);
- prev->prev = new;
+ next->prev = new;
+}
+
+static inline void
+list_add_rcu(struct list_head *new, struct list_head *head)
+{
+ linux_list_add_rcu(new, head, head->next);
+}
+
+static inline void
+list_add_tail_rcu(struct list_head *new, struct list_head *head)
+{
+ linux_list_add_rcu(new, head->prev, head);
+}
+
+static inline void
+__list_del_rcu(struct list_head *prev, struct list_head *next)
+{
+ next->prev = prev;
+ rcu_assign_pointer(list_next_rcu(prev), next);
+}
+
+static inline void
+__list_del_entry_rcu(struct list_head *entry)
+{
+ __list_del_rcu(entry->prev, entry->next);
+}
+
+static inline void
+list_del_rcu(struct list_head *entry)
+{
+ __list_del_rcu(entry->prev, entry->next);
}
#define hlist_first_rcu(head) (*((struct hlist_node
**)(&(head)->first)))
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