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1da177e4 LT |
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) | |
18 | extern void __chk_user_ptr(void __user *); | |
19 | extern 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> | |
1da177e4 LT |
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 | /* | |
82 | * Allow us to mark functions as 'deprecated' and have gcc emit a nice | |
83 | * warning for each use, in hopes of speeding the functions removal. | |
84 | * Usage is: | |
85 | * int __deprecated foo(void) | |
86 | */ | |
87 | #ifndef __deprecated | |
88 | # define __deprecated /* unimplemented */ | |
89 | #endif | |
90 | ||
512345be PM |
91 | #ifdef MODULE |
92 | #define __deprecated_for_modules __deprecated | |
93 | #else | |
94 | #define __deprecated_for_modules | |
95 | #endif | |
96 | ||
1da177e4 LT |
97 | #ifndef __must_check |
98 | #define __must_check | |
99 | #endif | |
100 | ||
101 | /* | |
102 | * Allow us to avoid 'defined but not used' warnings on functions and data, | |
103 | * as well as force them to be emitted to the assembly file. | |
104 | * | |
105 | * As of gcc 3.3, static functions that are not marked with attribute((used)) | |
106 | * may be elided from the assembly file. As of gcc 3.3, static data not so | |
107 | * marked will not be elided, but this may change in a future gcc version. | |
108 | * | |
109 | * In prior versions of gcc, such functions and data would be emitted, but | |
110 | * would be warned about except with attribute((unused)). | |
111 | */ | |
112 | #ifndef __attribute_used__ | |
113 | # define __attribute_used__ /* unimplemented */ | |
114 | #endif | |
115 | ||
116 | /* | |
117 | * From the GCC manual: | |
118 | * | |
119 | * Many functions have no effects except the return value and their | |
120 | * return value depends only on the parameters and/or global | |
121 | * variables. Such a function can be subject to common subexpression | |
122 | * elimination and loop optimization just as an arithmetic operator | |
123 | * would be. | |
124 | * [...] | |
125 | */ | |
126 | #ifndef __attribute_pure__ | |
127 | # define __attribute_pure__ /* unimplemented */ | |
128 | #endif | |
129 | ||
130 | /* | |
131 | * From the GCC manual: | |
132 | * | |
133 | * Many functions do not examine any values except their arguments, | |
134 | * and have no effects except the return value. Basically this is | |
135 | * just slightly more strict class than the `pure' attribute above, | |
136 | * since function is not allowed to read global memory. | |
137 | * | |
138 | * Note that a function that has pointer arguments and examines the | |
139 | * data pointed to must _not_ be declared `const'. Likewise, a | |
140 | * function that calls a non-`const' function usually must not be | |
141 | * `const'. It does not make sense for a `const' function to return | |
142 | * `void'. | |
143 | */ | |
144 | #ifndef __attribute_const__ | |
145 | # define __attribute_const__ /* unimplemented */ | |
146 | #endif | |
147 | ||
148 | #ifndef noinline | |
149 | #define noinline | |
150 | #endif | |
151 | ||
152 | #ifndef __always_inline | |
153 | #define __always_inline inline | |
154 | #endif | |
155 | ||
156 | #endif /* __LINUX_COMPILER_H */ |