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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))) | |
c902e0a0 JT |
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) | |
dcc8e559 | 17 | # define __cond_lock(x,c) ((c) ? ({ __acquire(x); 1; }) : 0) |
c47ffe3d AV |
18 | extern void __chk_user_ptr(const volatile void __user *); |
19 | extern void __chk_io_ptr(const volatile void __iomem *); | |
1da177e4 LT |
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 | |
dcc8e559 | 34 | # define __cond_lock(x,c) (c) |
1da177e4 LT |
35 | #endif |
36 | ||
37 | #ifdef __KERNEL__ | |
38 | ||
21124a82 | 39 | #if __GNUC__ >= 4 |
1da177e4 | 40 | # include <linux/compiler-gcc4.h> |
53569ab7 | 41 | #elif __GNUC__ == 3 && __GNUC_MINOR__ >= 2 |
1da177e4 | 42 | # include <linux/compiler-gcc3.h> |
1da177e4 LT |
43 | #else |
44 | # error Sorry, your compiler is too old/not recognized. | |
45 | #endif | |
46 | ||
47 | /* Intel compiler defines __GNUC__. So we will overwrite implementations | |
48 | * coming from above header files here | |
49 | */ | |
50 | #ifdef __INTEL_COMPILER | |
51 | # include <linux/compiler-intel.h> | |
52 | #endif | |
53 | ||
54 | /* | |
55 | * Generic compiler-dependent macros required for kernel | |
56 | * build go below this comment. Actual compiler/compiler version | |
57 | * specific implementations come from the above header files | |
58 | */ | |
59 | ||
60 | #define likely(x) __builtin_expect(!!(x), 1) | |
61 | #define unlikely(x) __builtin_expect(!!(x), 0) | |
62 | ||
63 | /* Optimization barrier */ | |
64 | #ifndef barrier | |
65 | # define barrier() __memory_barrier() | |
66 | #endif | |
67 | ||
68 | #ifndef RELOC_HIDE | |
69 | # define RELOC_HIDE(ptr, off) \ | |
70 | ({ unsigned long __ptr; \ | |
71 | __ptr = (unsigned long) (ptr); \ | |
72 | (typeof(ptr)) (__ptr + (off)); }) | |
73 | #endif | |
74 | ||
75 | #endif /* __KERNEL__ */ | |
76 | ||
77 | #endif /* __ASSEMBLY__ */ | |
78 | ||
4f79c3ff | 79 | #ifdef __KERNEL__ |
1da177e4 LT |
80 | /* |
81 | * Allow us to mark functions as 'deprecated' and have gcc emit a nice | |
82 | * warning for each use, in hopes of speeding the functions removal. | |
83 | * Usage is: | |
84 | * int __deprecated foo(void) | |
85 | */ | |
86 | #ifndef __deprecated | |
87 | # define __deprecated /* unimplemented */ | |
88 | #endif | |
89 | ||
512345be PM |
90 | #ifdef MODULE |
91 | #define __deprecated_for_modules __deprecated | |
92 | #else | |
93 | #define __deprecated_for_modules | |
94 | #endif | |
95 | ||
1da177e4 LT |
96 | #ifndef __must_check |
97 | #define __must_check | |
98 | #endif | |
99 | ||
cebc04ba AM |
100 | #ifndef CONFIG_ENABLE_MUST_CHECK |
101 | #undef __must_check | |
102 | #define __must_check | |
103 | #endif | |
104 | ||
1da177e4 LT |
105 | /* |
106 | * Allow us to avoid 'defined but not used' warnings on functions and data, | |
107 | * as well as force them to be emitted to the assembly file. | |
108 | * | |
0d7ebbbc DR |
109 | * As of gcc 3.4, static functions that are not marked with attribute((used)) |
110 | * may be elided from the assembly file. As of gcc 3.4, static data not so | |
1da177e4 LT |
111 | * marked will not be elided, but this may change in a future gcc version. |
112 | * | |
0d7ebbbc DR |
113 | * NOTE: Because distributions shipped with a backported unit-at-a-time |
114 | * compiler in gcc 3.3, we must define __used to be __attribute__((used)) | |
115 | * for gcc >=3.3 instead of 3.4. | |
116 | * | |
1da177e4 LT |
117 | * In prior versions of gcc, such functions and data would be emitted, but |
118 | * would be warned about except with attribute((unused)). | |
0d7ebbbc DR |
119 | * |
120 | * Mark functions that are referenced only in inline assembly as __used so | |
121 | * the code is emitted even though it appears to be unreferenced. | |
1da177e4 LT |
122 | */ |
123 | #ifndef __attribute_used__ | |
0d7ebbbc DR |
124 | # define __attribute_used__ /* deprecated */ |
125 | #endif | |
126 | ||
127 | #ifndef __used | |
128 | # define __used /* unimplemented */ | |
129 | #endif | |
130 | ||
131 | #ifndef __maybe_unused | |
132 | # define __maybe_unused /* unimplemented */ | |
1da177e4 LT |
133 | #endif |
134 | ||
423bc7b2 DW |
135 | #ifndef noinline |
136 | #define noinline | |
137 | #endif | |
138 | ||
139 | #ifndef __always_inline | |
140 | #define __always_inline inline | |
141 | #endif | |
142 | ||
143 | #endif /* __KERNEL__ */ | |
144 | ||
1da177e4 LT |
145 | /* |
146 | * From the GCC manual: | |
147 | * | |
148 | * Many functions do not examine any values except their arguments, | |
149 | * and have no effects except the return value. Basically this is | |
150 | * just slightly more strict class than the `pure' attribute above, | |
151 | * since function is not allowed to read global memory. | |
152 | * | |
153 | * Note that a function that has pointer arguments and examines the | |
154 | * data pointed to must _not_ be declared `const'. Likewise, a | |
155 | * function that calls a non-`const' function usually must not be | |
156 | * `const'. It does not make sense for a `const' function to return | |
157 | * `void'. | |
158 | */ | |
159 | #ifndef __attribute_const__ | |
160 | # define __attribute_const__ /* unimplemented */ | |
161 | #endif | |
162 | ||
a586df06 AK |
163 | /* |
164 | * Tell gcc if a function is cold. The compiler will assume any path | |
165 | * directly leading to the call is unlikely. | |
166 | */ | |
167 | ||
168 | #ifndef __cold | |
169 | #define __cold | |
170 | #endif | |
171 | ||
1da177e4 | 172 | #endif /* __LINUX_COMPILER_H */ |