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 François 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 31 #ifndef _LINUX_COMPILER_H_ 32 #define _LINUX_COMPILER_H_ 33 34 #include <sys/cdefs.h> 35 36 #define __user 37 #define __kernel 38 #define __safe 39 #define __force 40 #define __nocast 41 #define __iomem 42 #define __chk_user_ptr(x) 0 43 #define __chk_io_ptr(x) 0 44 #define __builtin_warning(x, y...) (1) 45 #define __acquires(x) 46 #define __releases(x) 47 #define __acquire(x) 0 48 #define __release(x) 0 49 #define __cond_lock(x,c) (c) 50 #define __bitwise 51 #define __devinitdata 52 #define __init 53 #define __devinit 54 #define __devexit 55 #define __exit 56 #define __stringify(x) #x 57 #define __attribute_const__ __attribute__((__const__)) 58 #undef __always_inline 59 #define __always_inline inline 60 61 #define likely(x) __builtin_expect(!!(x), 1) 62 #define unlikely(x) __builtin_expect(!!(x), 0) 63 #define typeof(x) __typeof(x) 64 65 #define __read_mostly 66 #define __always_unused __unused 67 #define __must_check __heedresult 68 69 #define __printf(a,b) __printflike(a,b) 70 71 72 #define barrier() cpu_ccfence() 73 74 #define ACCESS_ONCE(x) (*(volatile typeof(x) *)&(x)) 75 76 #define WRITE_ONCE(x,v) do { \ 77 barrier(); \ 78 ACCESS_ONCE(x) = (v); \ 79 barrier(); \ 80 } while (0) 81 82 #define READ_ONCE(x) ({ \ 83 __typeof(x) __var = ({ \ 84 barrier(); \ 85 ACCESS_ONCE(x); \ 86 }); \ 87 barrier(); \ 88 __var; \ 89 }) 90 91 #endif /* _LINUX_COMPILER_H_ */ 92