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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 __attribute__((address_space(0))) |
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) |
18 | # define __percpu __attribute__((noderef, address_space(3))) |
19 | extern void __chk_user_ptr(const volatile void __user *); |
20 | extern void __chk_io_ptr(const volatile void __iomem *); |
21 | #else |
22 | # define __user |
23 | # define __kernel |
24 | # define __safe |
25 | # define __force |
26 | # define __nocast |
27 | # define __iomem |
28 | # define __chk_user_ptr(x) (void)0 |
29 | # define __chk_io_ptr(x) (void)0 |
30 | # define __builtin_warning(x, y...) (1) |
31 | # define __acquires(x) |
32 | # define __releases(x) |
33 | # define __acquire(x) (void)0 |
34 | # define __release(x) (void)0 |
35 | # define __cond_lock(x,c) (c) |
36 | # define __percpu |
37 | #endif |
38 | |
39 | #ifdef __KERNEL__ |
40 | |
41 | #ifdef __GNUC__ |
42 | #include <linux/compiler-gcc.h> |
43 | #endif |
44 | |
45 | #define notrace __attribute__((no_instrument_function)) |
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 | struct ftrace_branch_data { |
61 | const char *func; |
62 | const char *file; |
63 | unsigned line; |
64 | union { |
65 | struct { |
66 | unsigned long correct; |
67 | unsigned long incorrect; |
68 | }; |
69 | struct { |
70 | unsigned long miss; |
71 | unsigned long hit; |
72 | }; |
73 | unsigned long miss_hit[2]; |
74 | }; |
75 | }; |
76 | |
77 | /* |
78 | * Note: DISABLE_BRANCH_PROFILING can be used by special lowlevel code |
79 | * to disable branch tracing on a per file basis. |
80 | */ |
81 | #if defined(CONFIG_TRACE_BRANCH_PROFILING) \ |
82 | && !defined(DISABLE_BRANCH_PROFILING) && !defined(__CHECKER__) |
83 | void ftrace_likely_update(struct ftrace_branch_data *f, int val, int expect); |
84 | |
85 | #define likely_notrace(x) __builtin_expect(!!(x), 1) |
86 | #define unlikely_notrace(x) __builtin_expect(!!(x), 0) |
87 | |
88 | #define __branch_check__(x, expect) ({ \ |
89 | int ______r; \ |
90 | static struct ftrace_branch_data \ |
91 | __attribute__((__aligned__(4))) \ |
92 | __attribute__((section("_ftrace_annotated_branch"))) \ |
93 | ______f = { \ |
94 | .func = __func__, \ |
95 | .file = __FILE__, \ |
96 | .line = __LINE__, \ |
97 | }; \ |
98 | ______r = likely_notrace(x); \ |
99 | ftrace_likely_update(&______f, ______r, expect); \ |
100 | ______r; \ |
101 | }) |
102 | |
103 | /* |
104 | * Using __builtin_constant_p(x) to ignore cases where the return |
105 | * value is always the same. This idea is taken from a similar patch |
106 | * written by Daniel Walker. |
107 | */ |
108 | # ifndef likely |
109 | # define likely(x) (__builtin_constant_p(x) ? !!(x) : __branch_check__(x, 1)) |
110 | # endif |
111 | # ifndef unlikely |
112 | # define unlikely(x) (__builtin_constant_p(x) ? !!(x) : __branch_check__(x, 0)) |
113 | # endif |
114 | |
115 | #ifdef CONFIG_PROFILE_ALL_BRANCHES |
116 | /* |
117 | * "Define 'is'", Bill Clinton |
118 | * "Define 'if'", Steven Rostedt |
119 | */ |
120 | #define if(cond, ...) __trace_if( (cond , ## __VA_ARGS__) ) |
121 | #define __trace_if(cond) \ |
122 | if (__builtin_constant_p((cond)) ? !!(cond) : \ |
123 | ({ \ |
124 | int ______r; \ |
125 | static struct ftrace_branch_data \ |
126 | __attribute__((__aligned__(4))) \ |
127 | __attribute__((section("_ftrace_branch"))) \ |
128 | ______f = { \ |
129 | .func = __func__, \ |
130 | .file = __FILE__, \ |
131 | .line = __LINE__, \ |
132 | }; \ |
133 | ______r = !!(cond); \ |
134 | ______f.miss_hit[______r]++; \ |
135 | ______r; \ |
136 | })) |
137 | #endif /* CONFIG_PROFILE_ALL_BRANCHES */ |
138 | |
139 | #else |
140 | # define likely(x) __builtin_expect(!!(x), 1) |
141 | # define unlikely(x) __builtin_expect(!!(x), 0) |
142 | #endif |
143 | |
144 | /* Optimization barrier */ |
145 | #ifndef barrier |
146 | # define barrier() __memory_barrier() |
147 | #endif |
148 | |
149 | /* Unreachable code */ |
150 | #ifndef unreachable |
151 | # define unreachable() do { } while (1) |
152 | #endif |
153 | |
154 | #ifndef RELOC_HIDE |
155 | # define RELOC_HIDE(ptr, off) \ |
156 | ({ unsigned long __ptr; \ |
157 | __ptr = (unsigned long) (ptr); \ |
158 | (typeof(ptr)) (__ptr + (off)); }) |
159 | #endif |
160 | |
161 | #endif /* __KERNEL__ */ |
162 | |
163 | #endif /* __ASSEMBLY__ */ |
164 | |
165 | #ifdef __KERNEL__ |
166 | /* |
167 | * Allow us to mark functions as 'deprecated' and have gcc emit a nice |
168 | * warning for each use, in hopes of speeding the functions removal. |
169 | * Usage is: |
170 | * int __deprecated foo(void) |
171 | */ |
172 | #ifndef __deprecated |
173 | # define __deprecated /* unimplemented */ |
174 | #endif |
175 | |
176 | #ifdef MODULE |
177 | #define __deprecated_for_modules __deprecated |
178 | #else |
179 | #define __deprecated_for_modules |
180 | #endif |
181 | |
182 | #ifndef __must_check |
183 | #define __must_check |
184 | #endif |
185 | |
186 | #ifndef CONFIG_ENABLE_MUST_CHECK |
187 | #undef __must_check |
188 | #define __must_check |
189 | #endif |
190 | #ifndef CONFIG_ENABLE_WARN_DEPRECATED |
191 | #undef __deprecated |
192 | #undef __deprecated_for_modules |
193 | #define __deprecated |
194 | #define __deprecated_for_modules |
195 | #endif |
196 | |
197 | /* |
198 | * Allow us to avoid 'defined but not used' warnings on functions and data, |
199 | * as well as force them to be emitted to the assembly file. |
200 | * |
201 | * As of gcc 3.4, static functions that are not marked with attribute((used)) |
202 | * may be elided from the assembly file. As of gcc 3.4, static data not so |
203 | * marked will not be elided, but this may change in a future gcc version. |
204 | * |
205 | * NOTE: Because distributions shipped with a backported unit-at-a-time |
206 | * compiler in gcc 3.3, we must define __used to be __attribute__((used)) |
207 | * for gcc >=3.3 instead of 3.4. |
208 | * |
209 | * In prior versions of gcc, such functions and data would be emitted, but |
210 | * would be warned about except with attribute((unused)). |
211 | * |
212 | * Mark functions that are referenced only in inline assembly as __used so |
213 | * the code is emitted even though it appears to be unreferenced. |
214 | */ |
215 | #ifndef __used |
216 | # define __used /* unimplemented */ |
217 | #endif |
218 | |
219 | #ifndef __maybe_unused |
220 | # define __maybe_unused /* unimplemented */ |
221 | #endif |
222 | |
223 | #ifndef __always_unused |
224 | # define __always_unused /* unimplemented */ |
225 | #endif |
226 | |
227 | #ifndef noinline |
228 | #define noinline |
229 | #endif |
230 | |
231 | /* |
232 | * Rather then using noinline to prevent stack consumption, use |
233 | * noinline_for_stack instead. For documentaiton reasons. |
234 | */ |
235 | #define noinline_for_stack noinline |
236 | |
237 | #ifndef __always_inline |
238 | #define __always_inline inline |
239 | #endif |
240 | |
241 | #endif /* __KERNEL__ */ |
242 | |
243 | /* |
244 | * From the GCC manual: |
245 | * |
246 | * Many functions do not examine any values except their arguments, |
247 | * and have no effects except the return value. Basically this is |
248 | * just slightly more strict class than the `pure' attribute above, |
249 | * since function is not allowed to read global memory. |
250 | * |
251 | * Note that a function that has pointer arguments and examines the |
252 | * data pointed to must _not_ be declared `const'. Likewise, a |
253 | * function that calls a non-`const' function usually must not be |
254 | * `const'. It does not make sense for a `const' function to return |
255 | * `void'. |
256 | */ |
257 | #ifndef __attribute_const__ |
258 | # define __attribute_const__ /* unimplemented */ |
259 | #endif |
260 | |
261 | /* |
262 | * Tell gcc if a function is cold. The compiler will assume any path |
263 | * directly leading to the call is unlikely. |
264 | */ |
265 | |
266 | #ifndef __cold |
267 | #define __cold |
268 | #endif |
269 | |
270 | /* Simple shorthand for a section definition */ |
271 | #ifndef __section |
272 | # define __section(S) __attribute__ ((__section__(#S))) |
273 | #endif |
274 | |
275 | /* Are two types/vars the same type (ignoring qualifiers)? */ |
276 | #ifndef __same_type |
277 | # define __same_type(a, b) __builtin_types_compatible_p(typeof(a), typeof(b)) |
278 | #endif |
279 | |
280 | /* Compile time object size, -1 for unknown */ |
281 | #ifndef __compiletime_object_size |
282 | # define __compiletime_object_size(obj) -1 |
283 | #endif |
284 | #ifndef __compiletime_warning |
285 | # define __compiletime_warning(message) |
286 | #endif |
287 | #ifndef __compiletime_error |
288 | # define __compiletime_error(message) |
289 | #endif |
290 | |
291 | /* |
292 | * Prevent the compiler from merging or refetching accesses. The compiler |
293 | * is also forbidden from reordering successive instances of ACCESS_ONCE(), |
294 | * but only when the compiler is aware of some particular ordering. One way |
295 | * to make the compiler aware of ordering is to put the two invocations of |
296 | * ACCESS_ONCE() in different C statements. |
297 | * |
298 | * This macro does absolutely -nothing- to prevent the CPU from reordering, |
299 | * merging, or refetching absolutely anything at any time. Its main intended |
300 | * use is to mediate communication between process-level code and irq/NMI |
301 | * handlers, all running on the same CPU. |
302 | */ |
303 | #define ACCESS_ONCE(x) (*(volatile typeof(x) *)&(x)) |
304 | |
305 | #endif /* __LINUX_COMPILER_H */ |
306 |
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Tags:
od-2011-09-04
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