+// SPDX-FileCopyrightText: 2009 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+// SPDX-FileCopyrightText: 2009 Paul E. McKenney, IBM Corporation.
+//
+// SPDX-License-Identifier: LGPL-2.1-or-later
+
#ifndef _URCU_POINTER_STATIC_H
#define _URCU_POINTER_STATIC_H
/*
- * urcu/static/pointer.h
- *
* Userspace RCU header. Operations on pointers.
*
* TO BE INCLUDED ONLY IN CODE THAT IS TO BE RECOMPILED ON EACH LIBURCU
* RELEASE. See urcu.h for linking dynamically with the userspace rcu library.
*
- * Copyright (c) 2009 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
- * Copyright (c) 2009 Paul E. McKenney, IBM Corporation.
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library 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
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- *
* IBM's contributions to this file may be relicensed under LGPLv2 or later.
*/
/*
* If p is const (the pointer itself, not what it points to), using
* __typeof__(p) would declare a const variable, leading to
- * -Wincompatible-pointer-types errors. Using `+ 0` makes it an rvalue and
- * gets rid of the const-ness.
+ * -Wincompatible-pointer-types errors. Using the statement expression
+ * makes it an rvalue and gets rid of the const-ness.
*/
#ifdef __URCU_DEREFERENCE_USE_ATOMIC_CONSUME
# define _rcu_dereference(p) __extension__ ({ \
- __typeof__(p + 0) _________p1; \
+ __typeof__(__extension__ ({ \
+ __typeof__(p) __attribute__((unused)) _________p0 = { 0 }; \
+ _________p0; \
+ })) _________p1; \
__atomic_load(&(p), &_________p1, __ATOMIC_CONSUME); \
(_________p1); \
})