Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1#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>
45#elif __GNUC__ == 2
46# include <linux/compiler-gcc2.h>
47#else
48# error Sorry, your compiler is too old/not recognized.
49#endif
50
51/* Intel compiler defines __GNUC__. So we will overwrite implementations
52 * coming from above header files here
53 */
54#ifdef __INTEL_COMPILER
55# include <linux/compiler-intel.h>
56#endif
57
58/*
59 * Generic compiler-dependent macros required for kernel
60 * build go below this comment. Actual compiler/compiler version
61 * specific implementations come from the above header files
62 */
63
64#define likely(x) __builtin_expect(!!(x), 1)
65#define unlikely(x) __builtin_expect(!!(x), 0)
66
67/* Optimization barrier */
68#ifndef barrier
69# define barrier() __memory_barrier()
70#endif
71
72#ifndef RELOC_HIDE
73# define RELOC_HIDE(ptr, off) \
74 ({ unsigned long __ptr; \
75 __ptr = (unsigned long) (ptr); \
76 (typeof(ptr)) (__ptr + (off)); })
77#endif
78
79#endif /* __KERNEL__ */
80
81#endif /* __ASSEMBLY__ */
82
83/*
84 * Allow us to mark functions as 'deprecated' and have gcc emit a nice
85 * warning for each use, in hopes of speeding the functions removal.
86 * Usage is:
87 * int __deprecated foo(void)
88 */
89#ifndef __deprecated
90# define __deprecated /* unimplemented */
91#endif
92
93#ifdef MODULE
94#define __deprecated_for_modules __deprecated
95#else
96#define __deprecated_for_modules
97#endif
98
99#ifndef __must_check
100#define __must_check
101#endif
102
103/*
104 * Allow us to avoid 'defined but not used' warnings on functions and data,
105 * as well as force them to be emitted to the assembly file.
106 *
107 * As of gcc 3.3, static functions that are not marked with attribute((used))
108 * may be elided from the assembly file. As of gcc 3.3, static data not so
109 * marked will not be elided, but this may change in a future gcc version.
110 *
111 * In prior versions of gcc, such functions and data would be emitted, but
112 * would be warned about except with attribute((unused)).
113 */
114#ifndef __attribute_used__
115# define __attribute_used__ /* unimplemented */
116#endif
117
118/*
119 * From the GCC manual:
120 *
121 * Many functions have no effects except the return value and their
122 * return value depends only on the parameters and/or global
123 * variables. Such a function can be subject to common subexpression
124 * elimination and loop optimization just as an arithmetic operator
125 * would be.
126 * [...]
127 */
128#ifndef __attribute_pure__
129# define __attribute_pure__ /* unimplemented */
130#endif
131
132/*
133 * From the GCC manual:
134 *
135 * Many functions do not examine any values except their arguments,
136 * and have no effects except the return value. Basically this is
137 * just slightly more strict class than the `pure' attribute above,
138 * since function is not allowed to read global memory.
139 *
140 * Note that a function that has pointer arguments and examines the
141 * data pointed to must _not_ be declared `const'. Likewise, a
142 * function that calls a non-`const' function usually must not be
143 * `const'. It does not make sense for a `const' function to return
144 * `void'.
145 */
146#ifndef __attribute_const__
147# define __attribute_const__ /* unimplemented */
148#endif
149
150#ifndef noinline
151#define noinline
152#endif
153
154#ifndef __always_inline
155#define __always_inline inline
156#endif
157
158#endif /* __LINUX_COMPILER_H */