Rev 1964 | Rev 3480 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed
Rev | Author | Line No. | Line |
---|---|---|---|
1408 | serge | 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))) |
||
1964 | serge | 8 | # define __kernel __attribute__((address_space(0))) |
1408 | serge | 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) |
||
1964 | serge | 18 | # define __percpu __attribute__((noderef, address_space(3))) |
19 | #ifdef CONFIG_SPARSE_RCU_POINTER |
||
20 | # define __rcu __attribute__((noderef, address_space(4))) |
||
21 | #else |
||
22 | # define __rcu |
||
23 | #endif |
||
1408 | serge | 24 | extern void __chk_user_ptr(const volatile void __user *); |
25 | extern void __chk_io_ptr(const volatile void __iomem *); |
||
26 | #else |
||
27 | # define __user |
||
28 | # define __kernel |
||
29 | # define __safe |
||
30 | # define __force |
||
31 | # define __nocast |
||
32 | # define __iomem |
||
33 | # define __chk_user_ptr(x) (void)0 |
||
34 | # define __chk_io_ptr(x) (void)0 |
||
35 | # define __builtin_warning(x, y...) (1) |
||
36 | # define __acquires(x) |
||
37 | # define __releases(x) |
||
38 | # define __acquire(x) (void)0 |
||
39 | # define __release(x) (void)0 |
||
40 | # define __cond_lock(x,c) (c) |
||
1964 | serge | 41 | # define __percpu |
42 | # define __rcu |
||
1408 | serge | 43 | #endif |
44 | |||
45 | #ifdef __KERNEL__ |
||
46 | |||
47 | #ifdef __GNUC__ |
||
48 | #include |
||
49 | #endif |
||
50 | |||
51 | #define notrace __attribute__((no_instrument_function)) |
||
52 | |||
53 | /* Intel compiler defines __GNUC__. So we will overwrite implementations |
||
54 | * coming from above header files here |
||
55 | */ |
||
56 | #ifdef __INTEL_COMPILER |
||
57 | # include |
||
58 | #endif |
||
59 | |||
60 | /* |
||
61 | * Generic compiler-dependent macros required for kernel |
||
62 | * build go below this comment. Actual compiler/compiler version |
||
63 | * specific implementations come from the above header files |
||
64 | */ |
||
65 | |||
66 | struct ftrace_branch_data { |
||
67 | const char *func; |
||
68 | const char *file; |
||
69 | unsigned line; |
||
70 | union { |
||
71 | struct { |
||
72 | unsigned long correct; |
||
73 | unsigned long incorrect; |
||
74 | }; |
||
75 | struct { |
||
76 | unsigned long miss; |
||
77 | unsigned long hit; |
||
78 | }; |
||
79 | unsigned long miss_hit[2]; |
||
80 | }; |
||
81 | }; |
||
82 | |||
83 | /* |
||
84 | * Note: DISABLE_BRANCH_PROFILING can be used by special lowlevel code |
||
85 | * to disable branch tracing on a per file basis. |
||
86 | */ |
||
87 | #if defined(CONFIG_TRACE_BRANCH_PROFILING) \ |
||
88 | && !defined(DISABLE_BRANCH_PROFILING) && !defined(__CHECKER__) |
||
89 | void ftrace_likely_update(struct ftrace_branch_data *f, int val, int expect); |
||
90 | |||
91 | #define likely_notrace(x) __builtin_expect(!!(x), 1) |
||
92 | #define unlikely_notrace(x) __builtin_expect(!!(x), 0) |
||
93 | |||
94 | #define __branch_check__(x, expect) ({ \ |
||
95 | int ______r; \ |
||
96 | static struct ftrace_branch_data \ |
||
97 | __attribute__((__aligned__(4))) \ |
||
98 | __attribute__((section("_ftrace_annotated_branch"))) \ |
||
99 | ______f = { \ |
||
100 | .func = __func__, \ |
||
101 | .file = __FILE__, \ |
||
102 | .line = __LINE__, \ |
||
103 | }; \ |
||
104 | ______r = likely_notrace(x); \ |
||
105 | ftrace_likely_update(&______f, ______r, expect); \ |
||
106 | ______r; \ |
||
107 | }) |
||
108 | |||
109 | /* |
||
110 | * Using __builtin_constant_p(x) to ignore cases where the return |
||
111 | * value is always the same. This idea is taken from a similar patch |
||
112 | * written by Daniel Walker. |
||
113 | */ |
||
114 | # ifndef likely |
||
115 | # define likely(x) (__builtin_constant_p(x) ? !!(x) : __branch_check__(x, 1)) |
||
116 | # endif |
||
117 | # ifndef unlikely |
||
118 | # define unlikely(x) (__builtin_constant_p(x) ? !!(x) : __branch_check__(x, 0)) |
||
119 | # endif |
||
120 | |||
121 | #ifdef CONFIG_PROFILE_ALL_BRANCHES |
||
122 | /* |
||
123 | * "Define 'is'", Bill Clinton |
||
124 | * "Define 'if'", Steven Rostedt |
||
125 | */ |
||
126 | #define if(cond, ...) __trace_if( (cond , ## __VA_ARGS__) ) |
||
127 | #define __trace_if(cond) \ |
||
128 | if (__builtin_constant_p((cond)) ? !!(cond) : \ |
||
129 | ({ \ |
||
130 | int ______r; \ |
||
131 | static struct ftrace_branch_data \ |
||
132 | __attribute__((__aligned__(4))) \ |
||
133 | __attribute__((section("_ftrace_branch"))) \ |
||
134 | ______f = { \ |
||
135 | .func = __func__, \ |
||
136 | .file = __FILE__, \ |
||
137 | .line = __LINE__, \ |
||
138 | }; \ |
||
139 | ______r = !!(cond); \ |
||
140 | ______f.miss_hit[______r]++; \ |
||
141 | ______r; \ |
||
142 | })) |
||
143 | #endif /* CONFIG_PROFILE_ALL_BRANCHES */ |
||
144 | |||
145 | #else |
||
146 | # define likely(x) __builtin_expect(!!(x), 1) |
||
147 | # define unlikely(x) __builtin_expect(!!(x), 0) |
||
148 | #endif |
||
149 | |||
150 | /* Optimization barrier */ |
||
151 | #ifndef barrier |
||
152 | # define barrier() __memory_barrier() |
||
153 | #endif |
||
154 | |||
155 | /* Unreachable code */ |
||
156 | #ifndef unreachable |
||
157 | # define unreachable() do { } while (1) |
||
158 | #endif |
||
159 | |||
160 | #ifndef RELOC_HIDE |
||
161 | # define RELOC_HIDE(ptr, off) \ |
||
162 | ({ unsigned long __ptr; \ |
||
163 | __ptr = (unsigned long) (ptr); \ |
||
164 | (typeof(ptr)) (__ptr + (off)); }) |
||
165 | #endif |
||
166 | |||
167 | #endif /* __KERNEL__ */ |
||
168 | |||
169 | #endif /* __ASSEMBLY__ */ |
||
170 | |||
171 | #ifdef __KERNEL__ |
||
172 | /* |
||
173 | * Allow us to mark functions as 'deprecated' and have gcc emit a nice |
||
174 | * warning for each use, in hopes of speeding the functions removal. |
||
175 | * Usage is: |
||
176 | * int __deprecated foo(void) |
||
177 | */ |
||
178 | #ifndef __deprecated |
||
179 | # define __deprecated /* unimplemented */ |
||
180 | #endif |
||
181 | |||
182 | #ifdef MODULE |
||
183 | #define __deprecated_for_modules __deprecated |
||
184 | #else |
||
185 | #define __deprecated_for_modules |
||
186 | #endif |
||
187 | |||
188 | #ifndef __must_check |
||
189 | #define __must_check |
||
190 | #endif |
||
191 | |||
192 | #ifndef CONFIG_ENABLE_MUST_CHECK |
||
193 | #undef __must_check |
||
194 | #define __must_check |
||
195 | #endif |
||
196 | #ifndef CONFIG_ENABLE_WARN_DEPRECATED |
||
197 | #undef __deprecated |
||
198 | #undef __deprecated_for_modules |
||
199 | #define __deprecated |
||
200 | #define __deprecated_for_modules |
||
201 | #endif |
||
202 | |||
203 | /* |
||
204 | * Allow us to avoid 'defined but not used' warnings on functions and data, |
||
205 | * as well as force them to be emitted to the assembly file. |
||
206 | * |
||
207 | * As of gcc 3.4, static functions that are not marked with attribute((used)) |
||
208 | * may be elided from the assembly file. As of gcc 3.4, static data not so |
||
209 | * marked will not be elided, but this may change in a future gcc version. |
||
210 | * |
||
211 | * NOTE: Because distributions shipped with a backported unit-at-a-time |
||
212 | * compiler in gcc 3.3, we must define __used to be __attribute__((used)) |
||
213 | * for gcc >=3.3 instead of 3.4. |
||
214 | * |
||
215 | * In prior versions of gcc, such functions and data would be emitted, but |
||
216 | * would be warned about except with attribute((unused)). |
||
217 | * |
||
218 | * Mark functions that are referenced only in inline assembly as __used so |
||
219 | * the code is emitted even though it appears to be unreferenced. |
||
220 | */ |
||
221 | #ifndef __used |
||
222 | # define __used /* unimplemented */ |
||
223 | #endif |
||
224 | |||
225 | #ifndef __maybe_unused |
||
226 | # define __maybe_unused /* unimplemented */ |
||
227 | #endif |
||
228 | |||
229 | #ifndef __always_unused |
||
230 | # define __always_unused /* unimplemented */ |
||
231 | #endif |
||
232 | |||
233 | #ifndef noinline |
||
234 | #define noinline |
||
235 | #endif |
||
236 | |||
237 | /* |
||
238 | * Rather then using noinline to prevent stack consumption, use |
||
3031 | serge | 239 | * noinline_for_stack instead. For documentation reasons. |
1408 | serge | 240 | */ |
241 | #define noinline_for_stack noinline |
||
242 | |||
243 | #ifndef __always_inline |
||
244 | #define __always_inline inline |
||
245 | #endif |
||
246 | |||
247 | #endif /* __KERNEL__ */ |
||
248 | |||
249 | /* |
||
250 | * From the GCC manual: |
||
251 | * |
||
252 | * Many functions do not examine any values except their arguments, |
||
253 | * and have no effects except the return value. Basically this is |
||
254 | * just slightly more strict class than the `pure' attribute above, |
||
255 | * since function is not allowed to read global memory. |
||
256 | * |
||
257 | * Note that a function that has pointer arguments and examines the |
||
258 | * data pointed to must _not_ be declared `const'. Likewise, a |
||
259 | * function that calls a non-`const' function usually must not be |
||
260 | * `const'. It does not make sense for a `const' function to return |
||
261 | * `void'. |
||
262 | */ |
||
263 | #ifndef __attribute_const__ |
||
264 | # define __attribute_const__ /* unimplemented */ |
||
265 | #endif |
||
266 | |||
267 | /* |
||
268 | * Tell gcc if a function is cold. The compiler will assume any path |
||
269 | * directly leading to the call is unlikely. |
||
270 | */ |
||
271 | |||
272 | #ifndef __cold |
||
273 | #define __cold |
||
274 | #endif |
||
275 | |||
276 | /* Simple shorthand for a section definition */ |
||
277 | #ifndef __section |
||
278 | # define __section(S) __attribute__ ((__section__(#S))) |
||
279 | #endif |
||
280 | |||
3031 | serge | 281 | #ifndef __visible |
282 | #define __visible |
||
283 | #endif |
||
284 | |||
1408 | serge | 285 | /* Are two types/vars the same type (ignoring qualifiers)? */ |
286 | #ifndef __same_type |
||
287 | # define __same_type(a, b) __builtin_types_compatible_p(typeof(a), typeof(b)) |
||
288 | #endif |
||
289 | |||
290 | /* Compile time object size, -1 for unknown */ |
||
291 | #ifndef __compiletime_object_size |
||
292 | # define __compiletime_object_size(obj) -1 |
||
293 | #endif |
||
294 | #ifndef __compiletime_warning |
||
295 | # define __compiletime_warning(message) |
||
296 | #endif |
||
297 | #ifndef __compiletime_error |
||
298 | # define __compiletime_error(message) |
||
299 | #endif |
||
3031 | serge | 300 | #ifndef __linktime_error |
301 | # define __linktime_error(message) |
||
302 | #endif |
||
1408 | serge | 303 | /* |
304 | * Prevent the compiler from merging or refetching accesses. The compiler |
||
305 | * is also forbidden from reordering successive instances of ACCESS_ONCE(), |
||
306 | * but only when the compiler is aware of some particular ordering. One way |
||
307 | * to make the compiler aware of ordering is to put the two invocations of |
||
308 | * ACCESS_ONCE() in different C statements. |
||
309 | * |
||
310 | * This macro does absolutely -nothing- to prevent the CPU from reordering, |
||
311 | * merging, or refetching absolutely anything at any time. Its main intended |
||
312 | * use is to mediate communication between process-level code and irq/NMI |
||
313 | * handlers, all running on the same CPU. |
||
314 | */ |
||
315 | #define ACCESS_ONCE(x) (*(volatile typeof(x) *)&(x)) |
||
316 | |||
317 | #endif /* __LINUX_COMPILER_H */ |