X-Git-Url: http://git.liburcu.org/?a=blobdiff_plain;f=wrapper%2Flist.h;h=26594f41c9a9402e450a470f062231f2f733c056;hb=b7cdc18250880cc44edeef4a4b42c8ac7a135a6d;hp=0d79e5128c7b36555fee4a266d24a99a2550054a;hpb=7a09dcb7df9caab5c867f39f53009e860b98accb;p=lttng-modules.git

diff --git a/wrapper/list.h b/wrapper/list.h
index 0d79e512..26594f41 100644
--- a/wrapper/list.h
+++ b/wrapper/list.h
@@ -1,34 +1,29 @@
-#ifndef _LTTNG_WRAPPER_LIST_H
-#define _LTTNG_WRAPPER_LIST_H
-
-/*
+/* SPDX-License-Identifier: GPL-2.0-only
+ *
  * wrapper/list.h
  *
  * wrapper around linux/list.h.
  *
  * Copyright (C) 2015 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
  *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; only version 2 of the License.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
- *
  * This wrapper code is derived from Linux 3.19.2 include/linux/list.h
  * and include/linux/rculist.h, hence the GPLv2 license applied to this
  * file.
  */
 
+#ifndef _LTTNG_WRAPPER_LIST_H
+#define _LTTNG_WRAPPER_LIST_H
+
 #include <linux/list.h>
 #include <linux/rculist.h>
 
+/*
+ * return the first or the next element in an RCU protected hlist
+ */
+#define lttng_hlist_first_rcu(head)	(*((struct hlist_node __rcu **)(&(head)->first)))
+#define lttng_hlist_next_rcu(node)	(*((struct hlist_node __rcu **)(&(node)->next)))
+#define lttng_hlist_pprev_rcu(node)	(*((struct hlist_node __rcu **)((node)->pprev)))
+
 #define lttng_hlist_entry_safe(ptr, type, member) \
 	({ typeof(ptr) ____ptr = (ptr); \
 	   ____ptr ? hlist_entry(____ptr, type, member) : NULL; \