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-rw-r--r--include/linux/compiler.h152
1 files changed, 152 insertions, 0 deletions
diff --git a/include/linux/compiler.h b/include/linux/compiler.h
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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#ifndef __must_check
94#define __must_check
95#endif
96
97/*
98 * Allow us to avoid 'defined but not used' warnings on functions and data,
99 * as well as force them to be emitted to the assembly file.
100 *
101 * As of gcc 3.3, static functions that are not marked with attribute((used))
102 * may be elided from the assembly file. As of gcc 3.3, static data not so
103 * marked will not be elided, but this may change in a future gcc version.
104 *
105 * In prior versions of gcc, such functions and data would be emitted, but
106 * would be warned about except with attribute((unused)).
107 */
108#ifndef __attribute_used__
109# define __attribute_used__ /* unimplemented */
110#endif
111
112/*
113 * From the GCC manual:
114 *
115 * Many functions have no effects except the return value and their
116 * return value depends only on the parameters and/or global
117 * variables. Such a function can be subject to common subexpression
118 * elimination and loop optimization just as an arithmetic operator
119 * would be.
120 * [...]
121 */
122#ifndef __attribute_pure__
123# define __attribute_pure__ /* unimplemented */
124#endif
125
126/*
127 * From the GCC manual:
128 *
129 * Many functions do not examine any values except their arguments,
130 * and have no effects except the return value. Basically this is
131 * just slightly more strict class than the `pure' attribute above,
132 * since function is not allowed to read global memory.
133 *
134 * Note that a function that has pointer arguments and examines the
135 * data pointed to must _not_ be declared `const'. Likewise, a
136 * function that calls a non-`const' function usually must not be
137 * `const'. It does not make sense for a `const' function to return
138 * `void'.
139 */
140#ifndef __attribute_const__
141# define __attribute_const__ /* unimplemented */
142#endif
143
144#ifndef noinline
145#define noinline
146#endif
147
148#ifndef __always_inline
149#define __always_inline inline
150#endif
151
152#endif /* __LINUX_COMPILER_H */