1f9f848faSopenharmony_ci/*- 2f9f848faSopenharmony_ci * Copyright (c) 2010 Isilon Systems, Inc. 3f9f848faSopenharmony_ci * Copyright (c) 2010 iX Systems, Inc. 4f9f848faSopenharmony_ci * Copyright (c) 2010 Panasas, Inc. 5f9f848faSopenharmony_ci * Copyright (c) 2013-2016 Mellanox Technologies, Ltd. 6f9f848faSopenharmony_ci * Copyright (c) 2015 François Tigeot 7f9f848faSopenharmony_ci * All rights reserved. 8f9f848faSopenharmony_ci * 9f9f848faSopenharmony_ci * Redistribution and use in source and binary forms, with or without 10f9f848faSopenharmony_ci * modification, are permitted provided that the following conditions 11f9f848faSopenharmony_ci * are met: 12f9f848faSopenharmony_ci * 1. Redistributions of source code must retain the above copyright 13f9f848faSopenharmony_ci * notice unmodified, this list of conditions, and the following 14f9f848faSopenharmony_ci * disclaimer. 15f9f848faSopenharmony_ci * 2. Redistributions in binary form must reproduce the above copyright 16f9f848faSopenharmony_ci * notice, this list of conditions and the following disclaimer in the 17f9f848faSopenharmony_ci * documentation and/or other materials provided with the distribution. 18f9f848faSopenharmony_ci * 19f9f848faSopenharmony_ci * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 20f9f848faSopenharmony_ci * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21f9f848faSopenharmony_ci * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22f9f848faSopenharmony_ci * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 23f9f848faSopenharmony_ci * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 24f9f848faSopenharmony_ci * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25f9f848faSopenharmony_ci * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26f9f848faSopenharmony_ci * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27f9f848faSopenharmony_ci * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 28f9f848faSopenharmony_ci * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29f9f848faSopenharmony_ci */ 30f9f848faSopenharmony_ci#ifndef _LINUXKPI_LINUX_COMPILER_H_ 31f9f848faSopenharmony_ci#define _LINUXKPI_LINUX_COMPILER_H_ 32f9f848faSopenharmony_ci 33f9f848faSopenharmony_ci#define ____cacheline_aligned_in_smp __aligned(CACHE_LINE_SIZE) 34f9f848faSopenharmony_ci#define fallthrough /* FALLTHROUGH */ do { } while(0) 35f9f848faSopenharmony_ci 36f9f848faSopenharmony_ci#define likely(x) __builtin_expect(!!(x), 1) 37f9f848faSopenharmony_ci#define unlikely(x) __builtin_expect(!!(x), 0) 38f9f848faSopenharmony_ci#define barrier() __asm__ __volatile__("": : :"memory") 39f9f848faSopenharmony_ci#define ACCESS_ONCE(x) (*(volatile __typeof(x) *)&(x)) 40f9f848faSopenharmony_ci#define WRITE_ONCE(x,v) do { \ 41f9f848faSopenharmony_ci barrier(); \ 42f9f848faSopenharmony_ci ACCESS_ONCE(x) = (v); \ 43f9f848faSopenharmony_ci barrier(); \ 44f9f848faSopenharmony_ci} while (0) 45f9f848faSopenharmony_ci 46f9f848faSopenharmony_ci#define READ_ONCE(x) ({ \ 47f9f848faSopenharmony_ci __typeof(x) __var = ({ \ 48f9f848faSopenharmony_ci barrier(); \ 49f9f848faSopenharmony_ci ACCESS_ONCE(x); \ 50f9f848faSopenharmony_ci }); \ 51f9f848faSopenharmony_ci barrier(); \ 52f9f848faSopenharmony_ci __var; \ 53f9f848faSopenharmony_ci}) 54f9f848faSopenharmony_ci 55f9f848faSopenharmony_ci#define sizeof_field(_s, _m) sizeof(((_s *)0)->_m) 56f9f848faSopenharmony_ci 57f9f848faSopenharmony_ci#endif /* _LINUXKPI_LINUX_COMPILER_H_ */ 58