compiler.h revision 299653
1/*- 2 * Copyright (c) 2010 Isilon Systems, Inc. 3 * Copyright (c) 2010 iX Systems, Inc. 4 * Copyright (c) 2010 Panasas, Inc. 5 * Copyright (c) 2013-2016 Mellanox Technologies, Ltd. 6 * Copyright (c) 2015 Fran��ois Tigeot 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice unmodified, this list of conditions, and the following 14 * disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 * 30 * $FreeBSD: head/sys/compat/linuxkpi/common/include/linux/compiler.h 299653 2016-05-13 10:10:43Z hselasky $ 31 */ 32#ifndef _LINUX_COMPILER_H_ 33#define _LINUX_COMPILER_H_ 34 35#include <sys/cdefs.h> 36 37#define __user 38#define __kernel 39#define __safe 40#define __force 41#define __nocast 42#define __iomem 43#define __chk_user_ptr(x) 0 44#define __chk_io_ptr(x) 0 45#define __builtin_warning(x, y...) (1) 46#define __acquires(x) 47#define __releases(x) 48#define __acquire(x) 0 49#define __release(x) 0 50#define __cond_lock(x,c) (c) 51#define __bitwise 52#define __devinitdata 53#define __deprecated 54#define __init 55#define __devinit 56#define __devexit 57#define __exit 58#define __rcu 59#define __stringify(x) #x 60#define __attribute_const__ __attribute__((__const__)) 61#undef __always_inline 62#define __always_inline inline 63#define ____cacheline_aligned __aligned(CACHE_LINE_SIZE) 64 65#define likely(x) __builtin_expect(!!(x), 1) 66#define unlikely(x) __builtin_expect(!!(x), 0) 67#define typeof(x) __typeof(x) 68 69#define uninitialized_var(x) x = x 70#define __read_mostly __attribute__((__section__(".data.read_mostly"))) 71#define __always_unused __unused 72#define __must_check __result_use_check 73 74#define __printf(a,b) __printflike(a,b) 75 76#define barrier() __asm__ __volatile__("": : :"memory") 77 78#define ___PASTE(a,b) a##b 79#define __PASTE(a,b) ___PASTE(a,b) 80 81#define ACCESS_ONCE(x) (*(volatile __typeof(x) *)&(x)) 82 83#define WRITE_ONCE(x,v) do { \ 84 barrier(); \ 85 ACCESS_ONCE(x) = (v); \ 86 barrier(); \ 87} while (0) 88 89#define READ_ONCE(x) ({ \ 90 __typeof(x) __var; \ 91 barrier(); \ 92 __var = ACCESS_ONCE(x); \ 93 barrier(); \ 94 __var; \ 95}) 96 97#define lockless_dereference(p) READ_ONCE(p) 98 99#define _AT(T,X) ((T)(X)) 100 101#endif /* _LINUX_COMPILER_H_ */ 102