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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 | ||
f153b821 LT |
39 | #ifdef __GNUC__ |
40 | #include <linux/compiler-gcc.h> | |
1da177e4 LT |
41 | #endif |
42 | ||
28614889 SR |
43 | #define notrace __attribute__((no_instrument_function)) |
44 | ||
1da177e4 LT |
45 | /* Intel compiler defines __GNUC__. So we will overwrite implementations |
46 | * coming from above header files here | |
47 | */ | |
48 | #ifdef __INTEL_COMPILER | |
49 | # include <linux/compiler-intel.h> | |
50 | #endif | |
51 | ||
52 | /* | |
53 | * Generic compiler-dependent macros required for kernel | |
54 | * build go below this comment. Actual compiler/compiler version | |
55 | * specific implementations come from the above header files | |
56 | */ | |
57 | ||
2ed84eeb | 58 | struct ftrace_branch_data { |
1f0d69a9 SR |
59 | const char *func; |
60 | const char *file; | |
61 | unsigned line; | |
2bcd521a SR |
62 | union { |
63 | struct { | |
64 | unsigned long correct; | |
65 | unsigned long incorrect; | |
66 | }; | |
67 | struct { | |
68 | unsigned long miss; | |
69 | unsigned long hit; | |
70 | }; | |
71 | }; | |
1f0d69a9 | 72 | }; |
2ed84eeb SR |
73 | |
74 | /* | |
75 | * Note: DISABLE_BRANCH_PROFILING can be used by special lowlevel code | |
76 | * to disable branch tracing on a per file basis. | |
77 | */ | |
78 | #if defined(CONFIG_TRACE_BRANCH_PROFILING) && !defined(DISABLE_BRANCH_PROFILING) | |
79 | void ftrace_likely_update(struct ftrace_branch_data *f, int val, int expect); | |
1f0d69a9 SR |
80 | |
81 | #define likely_notrace(x) __builtin_expect(!!(x), 1) | |
82 | #define unlikely_notrace(x) __builtin_expect(!!(x), 0) | |
83 | ||
45b79749 | 84 | #define __branch_check__(x, expect) ({ \ |
1f0d69a9 | 85 | int ______r; \ |
2ed84eeb | 86 | static struct ftrace_branch_data \ |
1f0d69a9 | 87 | __attribute__((__aligned__(4))) \ |
45b79749 | 88 | __attribute__((section("_ftrace_annotated_branch"))) \ |
1f0d69a9 SR |
89 | ______f = { \ |
90 | .func = __func__, \ | |
91 | .file = __FILE__, \ | |
92 | .line = __LINE__, \ | |
93 | }; \ | |
1f0d69a9 | 94 | ______r = likely_notrace(x); \ |
45b79749 | 95 | ftrace_likely_update(&______f, ______r, expect); \ |
1f0d69a9 SR |
96 | ______r; \ |
97 | }) | |
98 | ||
99 | /* | |
100 | * Using __builtin_constant_p(x) to ignore cases where the return | |
101 | * value is always the same. This idea is taken from a similar patch | |
102 | * written by Daniel Walker. | |
103 | */ | |
104 | # ifndef likely | |
45b79749 | 105 | # define likely(x) (__builtin_constant_p(x) ? !!(x) : __branch_check__(x, 1)) |
1f0d69a9 SR |
106 | # endif |
107 | # ifndef unlikely | |
45b79749 | 108 | # define unlikely(x) (__builtin_constant_p(x) ? !!(x) : __branch_check__(x, 0)) |
1f0d69a9 | 109 | # endif |
2bcd521a SR |
110 | |
111 | #ifdef CONFIG_PROFILE_ALL_BRANCHES | |
112 | /* | |
113 | * "Define 'is'", Bill Clinton | |
114 | * "Define 'if'", Steven Rostedt | |
115 | */ | |
116 | #define if(cond) if (__builtin_constant_p((cond)) ? !!(cond) : \ | |
117 | ({ \ | |
118 | int ______r; \ | |
119 | static struct ftrace_branch_data \ | |
120 | __attribute__((__aligned__(4))) \ | |
121 | __attribute__((section("_ftrace_branch"))) \ | |
122 | ______f = { \ | |
123 | .func = __func__, \ | |
124 | .file = __FILE__, \ | |
125 | .line = __LINE__, \ | |
126 | }; \ | |
127 | ______r = !!(cond); \ | |
128 | if (______r) \ | |
129 | ______f.hit++; \ | |
130 | else \ | |
131 | ______f.miss++; \ | |
132 | ______r; \ | |
133 | })) | |
134 | #endif /* CONFIG_PROFILE_ALL_BRANCHES */ | |
135 | ||
1f0d69a9 SR |
136 | #else |
137 | # define likely(x) __builtin_expect(!!(x), 1) | |
138 | # define unlikely(x) __builtin_expect(!!(x), 0) | |
139 | #endif | |
1da177e4 LT |
140 | |
141 | /* Optimization barrier */ | |
142 | #ifndef barrier | |
143 | # define barrier() __memory_barrier() | |
144 | #endif | |
145 | ||
146 | #ifndef RELOC_HIDE | |
147 | # define RELOC_HIDE(ptr, off) \ | |
148 | ({ unsigned long __ptr; \ | |
149 | __ptr = (unsigned long) (ptr); \ | |
150 | (typeof(ptr)) (__ptr + (off)); }) | |
151 | #endif | |
152 | ||
153 | #endif /* __KERNEL__ */ | |
154 | ||
155 | #endif /* __ASSEMBLY__ */ | |
156 | ||
4f79c3ff | 157 | #ifdef __KERNEL__ |
1da177e4 LT |
158 | /* |
159 | * Allow us to mark functions as 'deprecated' and have gcc emit a nice | |
160 | * warning for each use, in hopes of speeding the functions removal. | |
161 | * Usage is: | |
162 | * int __deprecated foo(void) | |
163 | */ | |
164 | #ifndef __deprecated | |
165 | # define __deprecated /* unimplemented */ | |
166 | #endif | |
167 | ||
512345be PM |
168 | #ifdef MODULE |
169 | #define __deprecated_for_modules __deprecated | |
170 | #else | |
171 | #define __deprecated_for_modules | |
172 | #endif | |
173 | ||
1da177e4 LT |
174 | #ifndef __must_check |
175 | #define __must_check | |
176 | #endif | |
177 | ||
cebc04ba AM |
178 | #ifndef CONFIG_ENABLE_MUST_CHECK |
179 | #undef __must_check | |
180 | #define __must_check | |
181 | #endif | |
de488443 JG |
182 | #ifndef CONFIG_ENABLE_WARN_DEPRECATED |
183 | #undef __deprecated | |
184 | #undef __deprecated_for_modules | |
185 | #define __deprecated | |
186 | #define __deprecated_for_modules | |
187 | #endif | |
cebc04ba | 188 | |
1da177e4 LT |
189 | /* |
190 | * Allow us to avoid 'defined but not used' warnings on functions and data, | |
191 | * as well as force them to be emitted to the assembly file. | |
192 | * | |
0d7ebbbc DR |
193 | * As of gcc 3.4, static functions that are not marked with attribute((used)) |
194 | * may be elided from the assembly file. As of gcc 3.4, static data not so | |
1da177e4 LT |
195 | * marked will not be elided, but this may change in a future gcc version. |
196 | * | |
0d7ebbbc DR |
197 | * NOTE: Because distributions shipped with a backported unit-at-a-time |
198 | * compiler in gcc 3.3, we must define __used to be __attribute__((used)) | |
199 | * for gcc >=3.3 instead of 3.4. | |
200 | * | |
1da177e4 LT |
201 | * In prior versions of gcc, such functions and data would be emitted, but |
202 | * would be warned about except with attribute((unused)). | |
0d7ebbbc DR |
203 | * |
204 | * Mark functions that are referenced only in inline assembly as __used so | |
205 | * the code is emitted even though it appears to be unreferenced. | |
1da177e4 | 206 | */ |
0d7ebbbc DR |
207 | #ifndef __used |
208 | # define __used /* unimplemented */ | |
209 | #endif | |
210 | ||
211 | #ifndef __maybe_unused | |
212 | # define __maybe_unused /* unimplemented */ | |
1da177e4 LT |
213 | #endif |
214 | ||
423bc7b2 DW |
215 | #ifndef noinline |
216 | #define noinline | |
217 | #endif | |
218 | ||
735c4fb9 AM |
219 | /* |
220 | * Rather then using noinline to prevent stack consumption, use | |
221 | * noinline_for_stack instead. For documentaiton reasons. | |
222 | */ | |
223 | #define noinline_for_stack noinline | |
224 | ||
423bc7b2 DW |
225 | #ifndef __always_inline |
226 | #define __always_inline inline | |
227 | #endif | |
228 | ||
229 | #endif /* __KERNEL__ */ | |
230 | ||
1da177e4 LT |
231 | /* |
232 | * From the GCC manual: | |
233 | * | |
234 | * Many functions do not examine any values except their arguments, | |
235 | * and have no effects except the return value. Basically this is | |
236 | * just slightly more strict class than the `pure' attribute above, | |
237 | * since function is not allowed to read global memory. | |
238 | * | |
239 | * Note that a function that has pointer arguments and examines the | |
240 | * data pointed to must _not_ be declared `const'. Likewise, a | |
241 | * function that calls a non-`const' function usually must not be | |
242 | * `const'. It does not make sense for a `const' function to return | |
243 | * `void'. | |
244 | */ | |
245 | #ifndef __attribute_const__ | |
246 | # define __attribute_const__ /* unimplemented */ | |
247 | #endif | |
248 | ||
a586df06 AK |
249 | /* |
250 | * Tell gcc if a function is cold. The compiler will assume any path | |
251 | * directly leading to the call is unlikely. | |
252 | */ | |
253 | ||
254 | #ifndef __cold | |
255 | #define __cold | |
256 | #endif | |
257 | ||
f3fe866d SR |
258 | /* Simple shorthand for a section definition */ |
259 | #ifndef __section | |
260 | # define __section(S) __attribute__ ((__section__(#S))) | |
261 | #endif | |
262 | ||
9c3cdc1f LT |
263 | /* |
264 | * Prevent the compiler from merging or refetching accesses. The compiler | |
265 | * is also forbidden from reordering successive instances of ACCESS_ONCE(), | |
266 | * but only when the compiler is aware of some particular ordering. One way | |
267 | * to make the compiler aware of ordering is to put the two invocations of | |
268 | * ACCESS_ONCE() in different C statements. | |
269 | * | |
270 | * This macro does absolutely -nothing- to prevent the CPU from reordering, | |
ded00a56 PM |
271 | * merging, or refetching absolutely anything at any time. Its main intended |
272 | * use is to mediate communication between process-level code and irq/NMI | |
273 | * handlers, all running on the same CPU. | |
9c3cdc1f LT |
274 | */ |
275 | #define ACCESS_ONCE(x) (*(volatile typeof(x) *)&(x)) | |
276 | ||
1da177e4 | 277 | #endif /* __LINUX_COMPILER_H */ |