1 /*- 2 * Copyright (c) 2015-2020 Mellanox Technologies, Ltd. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice unmodified, this list of conditions, and the following 10 * disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #ifndef _LINUXKPI_LINUX_SRCU_H_ 28 #define _LINUXKPI_LINUX_SRCU_H_ 29 30 #include <linux/compiler.h> 31 32 struct srcu_struct { 33 }; 34 35 #define srcu_dereference(p, srcu) \ 36 ((__typeof(*(p)) *)READ_ONCE(p)) 37 38 #define DEFINE_STATIC_SRCU(name) \ 39 static struct srcu_struct name 40 41 /* prototypes */ 42 43 extern int srcu_read_lock(struct srcu_struct *); 44 extern void srcu_read_unlock(struct srcu_struct *, int index); 45 extern void synchronize_srcu(struct srcu_struct *); 46 extern void srcu_barrier(struct srcu_struct *); 47 extern int init_srcu_struct(struct srcu_struct *); 48 extern void cleanup_srcu_struct(struct srcu_struct *); 49 50 #define synchronize_srcu_expedited(srcu) do { \ 51 synchronize_srcu(srcu); \ 52 } while (0) 53 54 #endif /* _LINUXKPI_LINUX_SRCU_H_ */ 55