compiler.h revision 322500 
1/*-
2 * Copyright (c) 2010 Isilon Systems, Inc.
3 * Copyright (c) 2010 iX Systems, Inc.
4 * Copyright (c) 2010 Panasas, Inc.
5 * Copyright (c) 2013-2015 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
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	uninitialized_var(x)		x = x
66#define	__read_mostly __attribute__((__section__(".data.read_mostly")))
67#define	__always_unused			__unused
68#define	__must_check			__result_use_check
69
70#define	__printf(a,b)			__printflike(a,b)
71
72#define	barrier()			__asm__ __volatile__("": : :"memory")
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