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 __must_hold(x) __attribute__((context(x,1,1)))
14# define __acquires(x) __attribute__((context(x,0,1)))
15# define __releases(x) __attribute__((context(x,1,0)))
16# define __acquire(x) __context__(x,1)
17# define __release(x) __context__(x,-1)
18# define __cond_lock(x,c) ((c) ? ({ __acquire(x); 1; }) : 0)
19# define __percpu __attribute__((noderef, address_space(3)))
20# define __pmem __attribute__((noderef, address_space(5)))
21#ifdef CONFIG_SPARSE_RCU_POINTER
22# define __rcu __attribute__((noderef, address_space(4)))
23#else
24# define __rcu
25#endif
26extern void __chk_user_ptr(const volatile void __user *);
27extern void __chk_io_ptr(const volatile void __iomem *);
28#else
29# define __user
30# define __kernel
31# define __safe
32# define __force
33# define __nocast
34# define __iomem
35# define __chk_user_ptr(x) (void)0
36# define __chk_io_ptr(x) (void)0
37# define __builtin_warning(x, y...) (1)
38# define __must_hold(x)
39# define __acquires(x)
40# define __releases(x)
41# define __acquire(x) (void)0
42# define __release(x) (void)0
43# define __cond_lock(x,c) (c)
44# define __percpu
45# define __rcu
46# define __pmem
47#endif
48
49
50#define ___PASTE(a,b) a##b
51#define __PASTE(a,b) ___PASTE(a,b)
52
53#ifdef __KERNEL__
54
55#ifdef __GNUC__
56#include <linux/compiler-gcc.h>
57#endif
58
59#if defined(CC_USING_HOTPATCH) && !defined(__CHECKER__)
60#define notrace __attribute__((hotpatch(0,0)))
61#else
62#define notrace __attribute__((no_instrument_function))
63#endif
64
65
66
67
68#ifdef __INTEL_COMPILER
69# include <linux/compiler-intel.h>
70#endif
71
72
73
74
75#ifdef __clang__
76#include <linux/compiler-clang.h>
77#endif
78
79
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83
84
85struct ftrace_branch_data {
86 const char *func;
87 const char *file;
88 unsigned line;
89 union {
90 struct {
91 unsigned long correct;
92 unsigned long incorrect;
93 };
94 struct {
95 unsigned long miss;
96 unsigned long hit;
97 };
98 unsigned long miss_hit[2];
99 };
100};
101
102
103
104
105
106#if defined(CONFIG_TRACE_BRANCH_PROFILING) \
107 && !defined(DISABLE_BRANCH_PROFILING) && !defined(__CHECKER__)
108void ftrace_likely_update(struct ftrace_branch_data *f, int val, int expect);
109
110#define likely_notrace(x) __builtin_expect(!!(x), 1)
111#define unlikely_notrace(x) __builtin_expect(!!(x), 0)
112
113#define __branch_check__(x, expect) ({ \
114 int ______r; \
115 static struct ftrace_branch_data \
116 __attribute__((__aligned__(4))) \
117 __attribute__((section("_ftrace_annotated_branch"))) \
118 ______f = { \
119 .func = __func__, \
120 .file = __FILE__, \
121 .line = __LINE__, \
122 }; \
123 ______r = likely_notrace(x); \
124 ftrace_likely_update(&______f, ______r, expect); \
125 ______r; \
126 })
127
128
129
130
131
132
133# ifndef likely
134# define likely(x) (__builtin_constant_p(x) ? !!(x) : __branch_check__(x, 1))
135# endif
136# ifndef unlikely
137# define unlikely(x) (__builtin_constant_p(x) ? !!(x) : __branch_check__(x, 0))
138# endif
139
140#ifdef CONFIG_PROFILE_ALL_BRANCHES
141
142
143
144
145#define if(cond, ...) __trace_if( (cond , ## __VA_ARGS__) )
146#define __trace_if(cond) \
147 if (__builtin_constant_p(!!(cond)) ? !!(cond) : \
148 ({ \
149 int ______r; \
150 static struct ftrace_branch_data \
151 __attribute__((__aligned__(4))) \
152 __attribute__((section("_ftrace_branch"))) \
153 ______f = { \
154 .func = __func__, \
155 .file = __FILE__, \
156 .line = __LINE__, \
157 }; \
158 ______r = !!(cond); \
159 ______f.miss_hit[______r]++; \
160 ______r; \
161 }))
162#endif
163
164#else
165# define likely(x) __builtin_expect(!!(x), 1)
166# define unlikely(x) __builtin_expect(!!(x), 0)
167#endif
168
169
170#ifndef barrier
171# define barrier() __memory_barrier()
172#endif
173
174#ifndef barrier_data
175# define barrier_data(ptr) barrier()
176#endif
177
178
179#ifndef unreachable
180# define unreachable() do { } while (1)
181#endif
182
183#ifndef RELOC_HIDE
184# define RELOC_HIDE(ptr, off) \
185 ({ unsigned long __ptr; \
186 __ptr = (unsigned long) (ptr); \
187 (typeof(ptr)) (__ptr + (off)); })
188#endif
189
190#ifndef OPTIMIZER_HIDE_VAR
191#define OPTIMIZER_HIDE_VAR(var) barrier()
192#endif
193
194
195#ifndef __UNIQUE_ID
196# define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __LINE__)
197#endif
198
199#include <linux/types.h>
200
201#define __READ_ONCE_SIZE \
202({ \
203 switch (size) { \
204 case 1: *(__u8 *)res = *(volatile __u8 *)p; break; \
205 case 2: *(__u16 *)res = *(volatile __u16 *)p; break; \
206 case 4: *(__u32 *)res = *(volatile __u32 *)p; break; \
207 case 8: *(__u64 *)res = *(volatile __u64 *)p; break; \
208 default: \
209 barrier(); \
210 __builtin_memcpy((void *)res, (const void *)p, size); \
211 barrier(); \
212 } \
213})
214
215static __always_inline
216void __read_once_size(const volatile void *p, void *res, int size)
217{
218 __READ_ONCE_SIZE;
219}
220
221#ifdef CONFIG_KASAN
222
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226
227
228static __no_sanitize_address __maybe_unused
229void __read_once_size_nocheck(const volatile void *p, void *res, int size)
230{
231 __READ_ONCE_SIZE;
232}
233#else
234static __always_inline
235void __read_once_size_nocheck(const volatile void *p, void *res, int size)
236{
237 __READ_ONCE_SIZE;
238}
239#endif
240
241static __always_inline void __write_once_size(volatile void *p, void *res, int size)
242{
243 switch (size) {
244 case 1: *(volatile __u8 *)p = *(__u8 *)res; break;
245 case 2: *(volatile __u16 *)p = *(__u16 *)res; break;
246 case 4: *(volatile __u32 *)p = *(__u32 *)res; break;
247 case 8: *(volatile __u64 *)p = *(__u64 *)res; break;
248 default:
249 barrier();
250 __builtin_memcpy((void *)p, (const void *)res, size);
251 barrier();
252 }
253}
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277#define __READ_ONCE(x, check) \
278({ \
279 union { typeof(x) __val; char __c[1]; } __u; \
280 if (check) \
281 __read_once_size(&(x), __u.__c, sizeof(x)); \
282 else \
283 __read_once_size_nocheck(&(x), __u.__c, sizeof(x)); \
284 __u.__val; \
285})
286#define READ_ONCE(x) __READ_ONCE(x, 1)
287
288
289
290
291
292#define READ_ONCE_NOCHECK(x) __READ_ONCE(x, 0)
293
294#define WRITE_ONCE(x, val) \
295({ \
296 union { typeof(x) __val; char __c[1]; } __u = \
297 { .__val = (__force typeof(x)) (val) }; \
298 __write_once_size(&(x), __u.__c, sizeof(x)); \
299 __u.__val; \
300})
301
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312
313#define smp_cond_acquire(cond) do { \
314 while (!(cond)) \
315 cpu_relax(); \
316 smp_rmb(); \
317} while (0)
318
319#endif
320
321#endif
322
323#ifdef __KERNEL__
324
325
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328
329
330#ifndef __deprecated
331# define __deprecated
332#endif
333
334#ifdef MODULE
335#define __deprecated_for_modules __deprecated
336#else
337#define __deprecated_for_modules
338#endif
339
340#ifndef __must_check
341#define __must_check
342#endif
343
344#ifndef CONFIG_ENABLE_MUST_CHECK
345#undef __must_check
346#define __must_check
347#endif
348#ifndef CONFIG_ENABLE_WARN_DEPRECATED
349#undef __deprecated
350#undef __deprecated_for_modules
351#define __deprecated
352#define __deprecated_for_modules
353#endif
354
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371
372
373#ifndef __used
374# define __used
375#endif
376
377#ifndef __maybe_unused
378# define __maybe_unused
379#endif
380
381#ifndef __always_unused
382# define __always_unused
383#endif
384
385#ifndef noinline
386#define noinline
387#endif
388
389
390
391
392
393#define noinline_for_stack noinline
394
395#ifndef __always_inline
396#define __always_inline inline
397#endif
398
399#endif
400
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414
415#ifndef __attribute_const__
416# define __attribute_const__
417#endif
418
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421
422
423
424#ifndef __cold
425#define __cold
426#endif
427
428
429#ifndef __section
430# define __section(S) __attribute__ ((__section__(#S)))
431#endif
432
433#ifndef __visible
434#define __visible
435#endif
436
437
438
439
440#ifndef __assume_aligned
441#define __assume_aligned(a, ...)
442#endif
443
444
445
446#ifndef __same_type
447# define __same_type(a, b) __builtin_types_compatible_p(typeof(a), typeof(b))
448#endif
449
450
451#ifndef __native_word
452# define __native_word(t) (sizeof(t) == sizeof(char) || sizeof(t) == sizeof(short) || sizeof(t) == sizeof(int) || sizeof(t) == sizeof(long))
453#endif
454
455
456#ifndef __compiletime_object_size
457# define __compiletime_object_size(obj) -1
458#endif
459#ifndef __compiletime_warning
460# define __compiletime_warning(message)
461#endif
462#ifndef __compiletime_error
463# define __compiletime_error(message)
464
465
466
467
468
469
470# ifndef __CHECKER__
471# define __compiletime_error_fallback(condition) \
472 do { ((void)sizeof(char[1 - 2 * condition])); } while (0)
473# endif
474#endif
475#ifndef __compiletime_error_fallback
476# define __compiletime_error_fallback(condition) do { } while (0)
477#endif
478
479#ifdef __OPTIMIZE__
480# define __compiletime_assert(condition, msg, prefix, suffix) \
481 do { \
482 bool __cond = !(condition); \
483 extern void prefix ## suffix(void) __compiletime_error(msg); \
484 if (__cond) \
485 prefix ## suffix(); \
486 __compiletime_error_fallback(__cond); \
487 } while (0)
488#else
489# define __compiletime_assert(condition, msg, prefix, suffix) do { } while (0)
490#endif
491
492#define _compiletime_assert(condition, msg, prefix, suffix) \
493 __compiletime_assert(condition, msg, prefix, suffix)
494
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502
503
504#define compiletime_assert(condition, msg) \
505 _compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
506
507#define compiletime_assert_atomic_type(t) \
508 compiletime_assert(__native_word(t), \
509 "Need native word sized stores/loads for atomicity.")
510
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530
531#define __ACCESS_ONCE(x) ({ \
532 __maybe_unused typeof(x) __var = (__force typeof(x)) 0; \
533 (volatile typeof(x) *)&(x); })
534#define ACCESS_ONCE(x) (*__ACCESS_ONCE(x))
535
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541
542
543
544#define lockless_dereference(p) \
545({ \
546 typeof(p) _________p1 = READ_ONCE(p); \
547 smp_read_barrier_depends(); \
548 (_________p1); \
549})
550
551
552#ifdef CONFIG_KPROBES
553# define __kprobes __attribute__((__section__(".kprobes.text")))
554# define nokprobe_inline __always_inline
555#else
556# define __kprobes
557# define nokprobe_inline inline
558#endif
559#endif
560