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