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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#ifndef __LINUX_COMPILER_H
2#define __LINUX_COMPILER_H
3
4#ifndef __ASSEMBLY__
5
6#ifdef __CHECKER__
7# define __user __attribute__((noderef, address_space(1)))
8# define __kernel /* default address space */
9# define __safe __attribute__((safe))
10# define __force __attribute__((force))
11# define __nocast __attribute__((nocast))
12# define __iomem __attribute__((noderef, address_space(2)))
13# define __acquires(x) __attribute__((context(0,1)))
14# define __releases(x) __attribute__((context(1,0)))
15# define __acquire(x) __context__(1)
16# define __release(x) __context__(-1)
17# define __cond_lock(x) ((x) ? ({ __context__(1); 1; }) : 0)
18extern void __chk_user_ptr(void __user *);
19extern void __chk_io_ptr(void __iomem *);
20#else
21# define __user
22# define __kernel
23# define __safe
24# define __force
25# define __nocast
26# define __iomem
27# define __chk_user_ptr(x) (void)0
28# define __chk_io_ptr(x) (void)0
29# define __builtin_warning(x, y...) (1)
30# define __acquires(x)
31# define __releases(x)
32# define __acquire(x) (void)0
33# define __release(x) (void)0
34# define __cond_lock(x) (x)
35#endif
36
37#ifdef __KERNEL__
38
39#if __GNUC__ > 4
40#error no compiler-gcc.h file for this gcc version
41#elif __GNUC__ == 4
42# include <linux/compiler-gcc4.h>
43#elif __GNUC__ == 3
44# include <linux/compiler-gcc3.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070045#else
46# error Sorry, your compiler is too old/not recognized.
47#endif
48
49/* Intel compiler defines __GNUC__. So we will overwrite implementations
50 * coming from above header files here
51 */
52#ifdef __INTEL_COMPILER
53# include <linux/compiler-intel.h>
54#endif
55
56/*
57 * Generic compiler-dependent macros required for kernel
58 * build go below this comment. Actual compiler/compiler version
59 * specific implementations come from the above header files
60 */
61
62#define likely(x) __builtin_expect(!!(x), 1)
63#define unlikely(x) __builtin_expect(!!(x), 0)
64
65/* Optimization barrier */
66#ifndef barrier
67# define barrier() __memory_barrier()
68#endif
69
70#ifndef RELOC_HIDE
71# define RELOC_HIDE(ptr, off) \
72 ({ unsigned long __ptr; \
73 __ptr = (unsigned long) (ptr); \
74 (typeof(ptr)) (__ptr + (off)); })
75#endif
76
77#endif /* __KERNEL__ */
78
79#endif /* __ASSEMBLY__ */
80
David Woodhouse4f79c3f2006-05-02 10:41:25 +010081#ifdef __KERNEL__
Linus Torvalds1da177e2005-04-16 15:20:36 -070082/*
83 * Allow us to mark functions as 'deprecated' and have gcc emit a nice
84 * warning for each use, in hopes of speeding the functions removal.
85 * Usage is:
86 * int __deprecated foo(void)
87 */
88#ifndef __deprecated
89# define __deprecated /* unimplemented */
90#endif
91
Paul E. McKenney512345b2005-05-01 08:59:03 -070092#ifdef MODULE
93#define __deprecated_for_modules __deprecated
94#else
95#define __deprecated_for_modules
96#endif
97
Linus Torvalds1da177e2005-04-16 15:20:36 -070098#ifndef __must_check
99#define __must_check
100#endif
101
102/*
103 * Allow us to avoid 'defined but not used' warnings on functions and data,
104 * as well as force them to be emitted to the assembly file.
105 *
106 * As of gcc 3.3, static functions that are not marked with attribute((used))
107 * may be elided from the assembly file. As of gcc 3.3, static data not so
108 * marked will not be elided, but this may change in a future gcc version.
109 *
110 * In prior versions of gcc, such functions and data would be emitted, but
111 * would be warned about except with attribute((unused)).
112 */
113#ifndef __attribute_used__
114# define __attribute_used__ /* unimplemented */
115#endif
116
117/*
118 * From the GCC manual:
119 *
120 * Many functions have no effects except the return value and their
121 * return value depends only on the parameters and/or global
122 * variables. Such a function can be subject to common subexpression
123 * elimination and loop optimization just as an arithmetic operator
124 * would be.
125 * [...]
126 */
127#ifndef __attribute_pure__
128# define __attribute_pure__ /* unimplemented */
129#endif
130
David Woodhouse423bc7b2006-05-04 00:41:02 +0100131#ifndef noinline
132#define noinline
133#endif
134
135#ifndef __always_inline
136#define __always_inline inline
137#endif
138
139#endif /* __KERNEL__ */
140
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141/*
142 * From the GCC manual:
143 *
144 * Many functions do not examine any values except their arguments,
145 * and have no effects except the return value. Basically this is
146 * just slightly more strict class than the `pure' attribute above,
147 * since function is not allowed to read global memory.
148 *
149 * Note that a function that has pointer arguments and examines the
150 * data pointed to must _not_ be declared `const'. Likewise, a
151 * function that calls a non-`const' function usually must not be
152 * `const'. It does not make sense for a `const' function to return
153 * `void'.
154 */
155#ifndef __attribute_const__
156# define __attribute_const__ /* unimplemented */
157#endif
158
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159#endif /* __LINUX_COMPILER_H */