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(x,0,1)))
14# define __releases(x) __attribute__((context(x,1,0)))
15# define __acquire(x) __context__(x,1)
16# define __release(x) __context__(x,-1)
17# define __cond_lock(x,c) ((c) ? ({ __acquire(x); 1; }) : 0)
18extern void __chk_user_ptr(const void __user *);
19extern void __chk_io_ptr(const 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,c) (c)
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 && __GNUC_MINOR__ >= 2
44# include <linux/compiler-gcc3.h>
45#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
81#ifdef __KERNEL__
82/*
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
92#ifdef MODULE
93#define __deprecated_for_modules __deprecated
94#else
95#define __deprecated_for_modules
96#endif
97
98#ifndef __must_check
99#define __must_check
100#endif
101
102#ifndef CONFIG_ENABLE_MUST_CHECK
103#undef __must_check
104#define __must_check
105#endif
106
107/*
108 * Allow us to avoid 'defined but not used' warnings on functions and data,
109 * as well as force them to be emitted to the assembly file.
110 *
111 * As of gcc 3.4, static functions that are not marked with attribute((used))
112 * may be elided from the assembly file. As of gcc 3.4, static data not so
113 * marked will not be elided, but this may change in a future gcc version.
114 *
115 * NOTE: Because distributions shipped with a backported unit-at-a-time
116 * compiler in gcc 3.3, we must define __used to be __attribute__((used))
117 * for gcc >=3.3 instead of 3.4.
118 *
119 * In prior versions of gcc, such functions and data would be emitted, but
120 * would be warned about except with attribute((unused)).
121 *
122 * Mark functions that are referenced only in inline assembly as __used so
123 * the code is emitted even though it appears to be unreferenced.
124 */
125#ifndef __attribute_used__
126# define __attribute_used__ /* deprecated */
127#endif
128
129#ifndef __used
130# define __used /* unimplemented */
131#endif
132
133#ifndef __maybe_unused
134# define __maybe_unused /* unimplemented */
135#endif
136
137/*
138 * From the GCC manual:
139 *
140 * Many functions have no effects except the return value and their
141 * return value depends only on the parameters and/or global
142 * variables. Such a function can be subject to common subexpression
143 * elimination and loop optimization just as an arithmetic operator
144 * would be.
145 * [...]
146 */
147#ifndef __attribute_pure__
148# define __attribute_pure__ /* unimplemented */
149#endif
150
151#ifndef noinline
152#define noinline
153#endif
154
155#ifndef __always_inline
156#define __always_inline inline
157#endif
158
159#endif /* __KERNEL__ */
160
161/*
162 * From the GCC manual:
163 *
164 * Many functions do not examine any values except their arguments,
165 * and have no effects except the return value. Basically this is
166 * just slightly more strict class than the `pure' attribute above,
167 * since function is not allowed to read global memory.
168 *
169 * Note that a function that has pointer arguments and examines the
170 * data pointed to must _not_ be declared `const'. Likewise, a
171 * function that calls a non-`const' function usually must not be
172 * `const'. It does not make sense for a `const' function to return
173 * `void'.
174 */
175#ifndef __attribute_const__
176# define __attribute_const__ /* unimplemented */
177#endif
178
179#endif /* __LINUX_COMPILER_H */