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
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)
18extern void __chk_user_ptr(const volatile void __user *);
19extern void __chk_io_ptr(const volatile void __iomem *);
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
34# define __cond_lock(x,c) (c)
35#endif
36
37#ifdef __KERNEL__
38
39#ifdef __GNUC__
40#include <linux/compiler-gcc.h>
41#endif
42
43#define notrace __attribute__((no_instrument_function))
44
45
46
47
48#ifdef __INTEL_COMPILER
49# include <linux/compiler-intel.h>
50#endif
51
52
53
54
55
56
57
58struct ftrace_branch_data {
59 const char *func;
60 const char *file;
61 unsigned line;
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 unsigned long miss_hit[2];
72 };
73};
74
75
76
77
78
79#if defined(CONFIG_TRACE_BRANCH_PROFILING) \
80 && !defined(DISABLE_BRANCH_PROFILING) && !defined(__CHECKER__)
81void ftrace_likely_update(struct ftrace_branch_data *f, int val, int expect);
82
83#define likely_notrace(x) __builtin_expect(!!(x), 1)
84#define unlikely_notrace(x) __builtin_expect(!!(x), 0)
85
86#define __branch_check__(x, expect) ({ \
87 int ______r; \
88 static struct ftrace_branch_data \
89 __attribute__((__aligned__(4))) \
90 __attribute__((section("_ftrace_annotated_branch"))) \
91 ______f = { \
92 .func = __func__, \
93 .file = __FILE__, \
94 .line = __LINE__, \
95 }; \
96 ______r = likely_notrace(x); \
97 ftrace_likely_update(&______f, ______r, expect); \
98 ______r; \
99 })
100
101
102
103
104
105
106# ifndef likely
107# define likely(x) (__builtin_constant_p(x) ? !!(x) : __branch_check__(x, 1))
108# endif
109# ifndef unlikely
110# define unlikely(x) (__builtin_constant_p(x) ? !!(x) : __branch_check__(x, 0))
111# endif
112
113#ifdef CONFIG_PROFILE_ALL_BRANCHES
114
115
116
117
118#define if(cond, ...) __trace_if( (cond , ## __VA_ARGS__) )
119#define __trace_if(cond) \
120 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 ______f.miss_hit[______r]++; \
133 ______r; \
134 }))
135#endif
136
137#else
138# define likely(x) __builtin_expect(!!(x), 1)
139# define unlikely(x) __builtin_expect(!!(x), 0)
140#endif
141
142
143#ifndef barrier
144# define barrier() __memory_barrier()
145#endif
146
147
148#ifndef unreachable
149# define unreachable() do { } while (1)
150#endif
151
152#ifndef RELOC_HIDE
153# define RELOC_HIDE(ptr, off) \
154 ({ unsigned long __ptr; \
155 __ptr = (unsigned long) (ptr); \
156 (typeof(ptr)) (__ptr + (off)); })
157#endif
158
159#endif
160
161#endif
162
163#ifdef __KERNEL__
164
165
166
167
168
169
170#ifndef __deprecated
171# define __deprecated
172#endif
173
174#ifdef MODULE
175#define __deprecated_for_modules __deprecated
176#else
177#define __deprecated_for_modules
178#endif
179
180#ifndef __must_check
181#define __must_check
182#endif
183
184#ifndef CONFIG_ENABLE_MUST_CHECK
185#undef __must_check
186#define __must_check
187#endif
188#ifndef CONFIG_ENABLE_WARN_DEPRECATED
189#undef __deprecated
190#undef __deprecated_for_modules
191#define __deprecated
192#define __deprecated_for_modules
193#endif
194
195
196
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211
212
213#ifndef __used
214# define __used
215#endif
216
217#ifndef __maybe_unused
218# define __maybe_unused
219#endif
220
221#ifndef __always_unused
222# define __always_unused
223#endif
224
225#ifndef noinline
226#define noinline
227#endif
228
229
230
231
232
233#define noinline_for_stack noinline
234
235#ifndef __always_inline
236#define __always_inline inline
237#endif
238
239#endif
240
241
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253
254
255#ifndef __attribute_const__
256# define __attribute_const__
257#endif
258
259
260
261
262
263
264#ifndef __cold
265#define __cold
266#endif
267
268
269#ifndef __section
270# define __section(S) __attribute__ ((__section__(#S)))
271#endif
272
273
274#ifndef __same_type
275# define __same_type(a, b) __builtin_types_compatible_p(typeof(a), typeof(b))
276#endif
277
278
279#ifndef __compiletime_object_size
280# define __compiletime_object_size(obj) -1
281#endif
282#ifndef __compiletime_warning
283# define __compiletime_warning(message)
284#endif
285#ifndef __compiletime_error
286# define __compiletime_error(message)
287#endif
288
289
290
291
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295
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297
298
299
300
301#define ACCESS_ONCE(x) (*(volatile typeof(x) *)&(x))
302
303#endif
304