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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 | ||
28614889 SR |
47 | #define notrace __attribute__((no_instrument_function)) |
48 | ||
1da177e4 LT |
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 | ||
2ed84eeb | 62 | struct ftrace_branch_data { |
1f0d69a9 SR |
63 | const char *func; |
64 | const char *file; | |
65 | unsigned line; | |
2bcd521a SR |
66 | union { |
67 | struct { | |
68 | unsigned long correct; | |
69 | unsigned long incorrect; | |
70 | }; | |
71 | struct { | |
72 | unsigned long miss; | |
73 | unsigned long hit; | |
74 | }; | |
75 | }; | |
1f0d69a9 | 76 | }; |
2ed84eeb SR |
77 | |
78 | /* | |
79 | * Note: DISABLE_BRANCH_PROFILING can be used by special lowlevel code | |
80 | * to disable branch tracing on a per file basis. | |
81 | */ | |
82 | #if defined(CONFIG_TRACE_BRANCH_PROFILING) && !defined(DISABLE_BRANCH_PROFILING) | |
83 | void ftrace_likely_update(struct ftrace_branch_data *f, int val, int expect); | |
1f0d69a9 SR |
84 | |
85 | #define likely_notrace(x) __builtin_expect(!!(x), 1) | |
86 | #define unlikely_notrace(x) __builtin_expect(!!(x), 0) | |
87 | ||
45b79749 | 88 | #define __branch_check__(x, expect) ({ \ |
1f0d69a9 | 89 | int ______r; \ |
2ed84eeb | 90 | static struct ftrace_branch_data \ |
1f0d69a9 | 91 | __attribute__((__aligned__(4))) \ |
45b79749 | 92 | __attribute__((section("_ftrace_annotated_branch"))) \ |
1f0d69a9 SR |
93 | ______f = { \ |
94 | .func = __func__, \ | |
95 | .file = __FILE__, \ | |
96 | .line = __LINE__, \ | |
97 | }; \ | |
1f0d69a9 | 98 | ______r = likely_notrace(x); \ |
45b79749 | 99 | ftrace_likely_update(&______f, ______r, expect); \ |
1f0d69a9 SR |
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 | |
45b79749 | 109 | # define likely(x) (__builtin_constant_p(x) ? !!(x) : __branch_check__(x, 1)) |
1f0d69a9 SR |
110 | # endif |
111 | # ifndef unlikely | |
45b79749 | 112 | # define unlikely(x) (__builtin_constant_p(x) ? !!(x) : __branch_check__(x, 0)) |
1f0d69a9 | 113 | # endif |
2bcd521a SR |
114 | |
115 | #ifdef CONFIG_PROFILE_ALL_BRANCHES | |
116 | /* | |
117 | * "Define 'is'", Bill Clinton | |
118 | * "Define 'if'", Steven Rostedt | |
119 | */ | |
120 | #define if(cond) if (__builtin_constant_p((cond)) ? !!(cond) : \ | |
121 | ({ \ | |
122 | int ______r; \ | |
123 | static struct ftrace_branch_data \ | |
124 | __attribute__((__aligned__(4))) \ | |
125 | __attribute__((section("_ftrace_branch"))) \ | |
126 | ______f = { \ | |
127 | .func = __func__, \ | |
128 | .file = __FILE__, \ | |
129 | .line = __LINE__, \ | |
130 | }; \ | |
131 | ______r = !!(cond); \ | |
132 | if (______r) \ | |
133 | ______f.hit++; \ | |
134 | else \ | |
135 | ______f.miss++; \ | |
136 | ______r; \ | |
137 | })) | |
138 | #endif /* CONFIG_PROFILE_ALL_BRANCHES */ | |
139 | ||
1f0d69a9 SR |
140 | #else |
141 | # define likely(x) __builtin_expect(!!(x), 1) | |
142 | # define unlikely(x) __builtin_expect(!!(x), 0) | |
143 | #endif | |
1da177e4 LT |
144 | |
145 | /* Optimization barrier */ | |
146 | #ifndef barrier | |
147 | # define barrier() __memory_barrier() | |
148 | #endif | |
149 | ||
150 | #ifndef RELOC_HIDE | |
151 | # define RELOC_HIDE(ptr, off) \ | |
152 | ({ unsigned long __ptr; \ | |
153 | __ptr = (unsigned long) (ptr); \ | |
154 | (typeof(ptr)) (__ptr + (off)); }) | |
155 | #endif | |
156 | ||
157 | #endif /* __KERNEL__ */ | |
158 | ||
159 | #endif /* __ASSEMBLY__ */ | |
160 | ||
4f79c3ff | 161 | #ifdef __KERNEL__ |
1da177e4 LT |
162 | /* |
163 | * Allow us to mark functions as 'deprecated' and have gcc emit a nice | |
164 | * warning for each use, in hopes of speeding the functions removal. | |
165 | * Usage is: | |
166 | * int __deprecated foo(void) | |
167 | */ | |
168 | #ifndef __deprecated | |
169 | # define __deprecated /* unimplemented */ | |
170 | #endif | |
171 | ||
512345be PM |
172 | #ifdef MODULE |
173 | #define __deprecated_for_modules __deprecated | |
174 | #else | |
175 | #define __deprecated_for_modules | |
176 | #endif | |
177 | ||
1da177e4 LT |
178 | #ifndef __must_check |
179 | #define __must_check | |
180 | #endif | |
181 | ||
cebc04ba AM |
182 | #ifndef CONFIG_ENABLE_MUST_CHECK |
183 | #undef __must_check | |
184 | #define __must_check | |
185 | #endif | |
de488443 JG |
186 | #ifndef CONFIG_ENABLE_WARN_DEPRECATED |
187 | #undef __deprecated | |
188 | #undef __deprecated_for_modules | |
189 | #define __deprecated | |
190 | #define __deprecated_for_modules | |
191 | #endif | |
cebc04ba | 192 | |
1da177e4 LT |
193 | /* |
194 | * Allow us to avoid 'defined but not used' warnings on functions and data, | |
195 | * as well as force them to be emitted to the assembly file. | |
196 | * | |
0d7ebbbc DR |
197 | * As of gcc 3.4, static functions that are not marked with attribute((used)) |
198 | * may be elided from the assembly file. As of gcc 3.4, static data not so | |
1da177e4 LT |
199 | * marked will not be elided, but this may change in a future gcc version. |
200 | * | |
0d7ebbbc DR |
201 | * NOTE: Because distributions shipped with a backported unit-at-a-time |
202 | * compiler in gcc 3.3, we must define __used to be __attribute__((used)) | |
203 | * for gcc >=3.3 instead of 3.4. | |
204 | * | |
1da177e4 LT |
205 | * In prior versions of gcc, such functions and data would be emitted, but |
206 | * would be warned about except with attribute((unused)). | |
0d7ebbbc DR |
207 | * |
208 | * Mark functions that are referenced only in inline assembly as __used so | |
209 | * the code is emitted even though it appears to be unreferenced. | |
1da177e4 | 210 | */ |
0d7ebbbc DR |
211 | #ifndef __used |
212 | # define __used /* unimplemented */ | |
213 | #endif | |
214 | ||
215 | #ifndef __maybe_unused | |
216 | # define __maybe_unused /* unimplemented */ | |
1da177e4 LT |
217 | #endif |
218 | ||
423bc7b2 DW |
219 | #ifndef noinline |
220 | #define noinline | |
221 | #endif | |
222 | ||
735c4fb9 AM |
223 | /* |
224 | * Rather then using noinline to prevent stack consumption, use | |
225 | * noinline_for_stack instead. For documentaiton reasons. | |
226 | */ | |
227 | #define noinline_for_stack noinline | |
228 | ||
423bc7b2 DW |
229 | #ifndef __always_inline |
230 | #define __always_inline inline | |
231 | #endif | |
232 | ||
233 | #endif /* __KERNEL__ */ | |
234 | ||
1da177e4 LT |
235 | /* |
236 | * From the GCC manual: | |
237 | * | |
238 | * Many functions do not examine any values except their arguments, | |
239 | * and have no effects except the return value. Basically this is | |
240 | * just slightly more strict class than the `pure' attribute above, | |
241 | * since function is not allowed to read global memory. | |
242 | * | |
243 | * Note that a function that has pointer arguments and examines the | |
244 | * data pointed to must _not_ be declared `const'. Likewise, a | |
245 | * function that calls a non-`const' function usually must not be | |
246 | * `const'. It does not make sense for a `const' function to return | |
247 | * `void'. | |
248 | */ | |
249 | #ifndef __attribute_const__ | |
250 | # define __attribute_const__ /* unimplemented */ | |
251 | #endif | |
252 | ||
a586df06 AK |
253 | /* |
254 | * Tell gcc if a function is cold. The compiler will assume any path | |
255 | * directly leading to the call is unlikely. | |
256 | */ | |
257 | ||
258 | #ifndef __cold | |
259 | #define __cold | |
260 | #endif | |
261 | ||
f3fe866d SR |
262 | /* Simple shorthand for a section definition */ |
263 | #ifndef __section | |
264 | # define __section(S) __attribute__ ((__section__(#S))) | |
265 | #endif | |
266 | ||
9c3cdc1f LT |
267 | /* |
268 | * Prevent the compiler from merging or refetching accesses. The compiler | |
269 | * is also forbidden from reordering successive instances of ACCESS_ONCE(), | |
270 | * but only when the compiler is aware of some particular ordering. One way | |
271 | * to make the compiler aware of ordering is to put the two invocations of | |
272 | * ACCESS_ONCE() in different C statements. | |
273 | * | |
274 | * This macro does absolutely -nothing- to prevent the CPU from reordering, | |
ded00a56 PM |
275 | * merging, or refetching absolutely anything at any time. Its main intended |
276 | * use is to mediate communication between process-level code and irq/NMI | |
277 | * handlers, all running on the same CPU. | |
9c3cdc1f LT |
278 | */ |
279 | #define ACCESS_ONCE(x) (*(volatile typeof(x) *)&(x)) | |
280 | ||
1da177e4 | 281 | #endif /* __LINUX_COMPILER_H */ |