xref: /freebsd/sys/compat/linuxkpi/common/include/linux/compiler.h (revision 273c26a3c3bea87a241d6879abd4f991db180bf0)
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  * $FreeBSD$
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