Commit | Line | Data |
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fbb9ce95 IM |
1 | /* |
2 | * Runtime locking correctness validator | |
3 | * | |
4b32d0a4 PZ |
4 | * Copyright (C) 2006,2007 Red Hat, Inc., Ingo Molnar <mingo@redhat.com> |
5 | * Copyright (C) 2007 Red Hat, Inc., Peter Zijlstra <pzijlstr@redhat.com> | |
fbb9ce95 IM |
6 | * |
7 | * see Documentation/lockdep-design.txt for more details. | |
8 | */ | |
9 | #ifndef __LINUX_LOCKDEP_H | |
10 | #define __LINUX_LOCKDEP_H | |
11 | ||
a1e96b03 | 12 | struct task_struct; |
f20786ff | 13 | struct lockdep_map; |
a1e96b03 | 14 | |
db0b0ead MT |
15 | #ifdef CONFIG_LOCKDEP |
16 | ||
fbb9ce95 IM |
17 | #include <linux/linkage.h> |
18 | #include <linux/list.h> | |
19 | #include <linux/debug_locks.h> | |
20 | #include <linux/stacktrace.h> | |
21 | ||
fbb9ce95 | 22 | /* |
9851673b PZ |
23 | * We'd rather not expose kernel/lockdep_states.h this wide, but we do need |
24 | * the total number of states... :-( | |
fbb9ce95 | 25 | */ |
9851673b | 26 | #define XXX_LOCK_USAGE_STATES (1+3*4) |
fbb9ce95 IM |
27 | |
28 | #define MAX_LOCKDEP_SUBCLASSES 8UL | |
29 | ||
30 | /* | |
31 | * Lock-classes are keyed via unique addresses, by embedding the | |
32 | * lockclass-key into the kernel (or module) .data section. (For | |
33 | * static locks we use the lock address itself as the key.) | |
34 | */ | |
35 | struct lockdep_subclass_key { | |
36 | char __one_byte; | |
37 | } __attribute__ ((__packed__)); | |
38 | ||
39 | struct lock_class_key { | |
40 | struct lockdep_subclass_key subkeys[MAX_LOCKDEP_SUBCLASSES]; | |
41 | }; | |
42 | ||
c7e78cff PZ |
43 | #define LOCKSTAT_POINTS 4 |
44 | ||
fbb9ce95 IM |
45 | /* |
46 | * The lock-class itself: | |
47 | */ | |
48 | struct lock_class { | |
49 | /* | |
50 | * class-hash: | |
51 | */ | |
52 | struct list_head hash_entry; | |
53 | ||
54 | /* | |
55 | * global list of all lock-classes: | |
56 | */ | |
57 | struct list_head lock_entry; | |
58 | ||
59 | struct lockdep_subclass_key *key; | |
60 | unsigned int subclass; | |
61 | ||
62 | /* | |
63 | * IRQ/softirq usage tracking bits: | |
64 | */ | |
65 | unsigned long usage_mask; | |
9851673b | 66 | struct stack_trace usage_traces[XXX_LOCK_USAGE_STATES]; |
fbb9ce95 IM |
67 | |
68 | /* | |
69 | * These fields represent a directed graph of lock dependencies, | |
70 | * to every node we attach a list of "forward" and a list of | |
71 | * "backward" graph nodes. | |
72 | */ | |
73 | struct list_head locks_after, locks_before; | |
74 | ||
75 | /* | |
76 | * Generation counter, when doing certain classes of graph walking, | |
77 | * to ensure that we check one node only once: | |
78 | */ | |
79 | unsigned int version; | |
80 | ||
81 | /* | |
82 | * Statistics counter: | |
83 | */ | |
84 | unsigned long ops; | |
85 | ||
86 | const char *name; | |
87 | int name_version; | |
f20786ff PZ |
88 | |
89 | #ifdef CONFIG_LOCK_STAT | |
c7e78cff PZ |
90 | unsigned long contention_point[LOCKSTAT_POINTS]; |
91 | unsigned long contending_point[LOCKSTAT_POINTS]; | |
f20786ff PZ |
92 | #endif |
93 | }; | |
94 | ||
95 | #ifdef CONFIG_LOCK_STAT | |
96 | struct lock_time { | |
97 | s64 min; | |
98 | s64 max; | |
99 | s64 total; | |
100 | unsigned long nr; | |
fbb9ce95 IM |
101 | }; |
102 | ||
96645678 PZ |
103 | enum bounce_type { |
104 | bounce_acquired_write, | |
105 | bounce_acquired_read, | |
106 | bounce_contended_write, | |
107 | bounce_contended_read, | |
108 | nr_bounce_types, | |
109 | ||
110 | bounce_acquired = bounce_acquired_write, | |
111 | bounce_contended = bounce_contended_write, | |
112 | }; | |
113 | ||
f20786ff PZ |
114 | struct lock_class_stats { |
115 | unsigned long contention_point[4]; | |
c7e78cff | 116 | unsigned long contending_point[4]; |
f20786ff PZ |
117 | struct lock_time read_waittime; |
118 | struct lock_time write_waittime; | |
119 | struct lock_time read_holdtime; | |
120 | struct lock_time write_holdtime; | |
96645678 | 121 | unsigned long bounces[nr_bounce_types]; |
f20786ff PZ |
122 | }; |
123 | ||
124 | struct lock_class_stats lock_stats(struct lock_class *class); | |
125 | void clear_lock_stats(struct lock_class *class); | |
126 | #endif | |
127 | ||
fbb9ce95 IM |
128 | /* |
129 | * Map the lock object (the lock instance) to the lock-class object. | |
130 | * This is embedded into specific lock instances: | |
131 | */ | |
132 | struct lockdep_map { | |
133 | struct lock_class_key *key; | |
d6d897ce | 134 | struct lock_class *class_cache; |
fbb9ce95 | 135 | const char *name; |
96645678 PZ |
136 | #ifdef CONFIG_LOCK_STAT |
137 | int cpu; | |
c7e78cff | 138 | unsigned long ip; |
96645678 | 139 | #endif |
fbb9ce95 IM |
140 | }; |
141 | ||
142 | /* | |
143 | * Every lock has a list of other locks that were taken after it. | |
144 | * We only grow the list, never remove from it: | |
145 | */ | |
146 | struct lock_list { | |
147 | struct list_head entry; | |
148 | struct lock_class *class; | |
149 | struct stack_trace trace; | |
068135e6 | 150 | int distance; |
c94aa5ca | 151 | |
af012961 PZ |
152 | /* |
153 | * The parent field is used to implement breadth-first search, and the | |
154 | * bit 0 is reused to indicate if the lock has been accessed in BFS. | |
c94aa5ca ML |
155 | */ |
156 | struct lock_list *parent; | |
fbb9ce95 IM |
157 | }; |
158 | ||
159 | /* | |
160 | * We record lock dependency chains, so that we can cache them: | |
161 | */ | |
162 | struct lock_chain { | |
443cd507 HY |
163 | u8 irq_context; |
164 | u8 depth; | |
165 | u16 base; | |
fbb9ce95 IM |
166 | struct list_head entry; |
167 | u64 chain_key; | |
168 | }; | |
169 | ||
e5f363e3 | 170 | #define MAX_LOCKDEP_KEYS_BITS 13 |
b42e737e PZ |
171 | /* |
172 | * Subtract one because we offset hlock->class_idx by 1 in order | |
173 | * to make 0 mean no class. This avoids overflowing the class_idx | |
174 | * bitfield and hitting the BUG in hlock_class(). | |
175 | */ | |
176 | #define MAX_LOCKDEP_KEYS ((1UL << MAX_LOCKDEP_KEYS_BITS) - 1) | |
f82b217e | 177 | |
fbb9ce95 IM |
178 | struct held_lock { |
179 | /* | |
180 | * One-way hash of the dependency chain up to this point. We | |
181 | * hash the hashes step by step as the dependency chain grows. | |
182 | * | |
183 | * We use it for dependency-caching and we skip detection | |
184 | * passes and dependency-updates if there is a cache-hit, so | |
185 | * it is absolutely critical for 100% coverage of the validator | |
186 | * to have a unique key value for every unique dependency path | |
187 | * that can occur in the system, to make a unique hash value | |
188 | * as likely as possible - hence the 64-bit width. | |
189 | * | |
190 | * The task struct holds the current hash value (initialized | |
191 | * with zero), here we store the previous hash value: | |
192 | */ | |
193 | u64 prev_chain_key; | |
fbb9ce95 IM |
194 | unsigned long acquire_ip; |
195 | struct lockdep_map *instance; | |
7531e2f3 | 196 | struct lockdep_map *nest_lock; |
f20786ff PZ |
197 | #ifdef CONFIG_LOCK_STAT |
198 | u64 waittime_stamp; | |
199 | u64 holdtime_stamp; | |
200 | #endif | |
f82b217e | 201 | unsigned int class_idx:MAX_LOCKDEP_KEYS_BITS; |
fbb9ce95 IM |
202 | /* |
203 | * The lock-stack is unified in that the lock chains of interrupt | |
204 | * contexts nest ontop of process context chains, but we 'separate' | |
205 | * the hashes by starting with 0 if we cross into an interrupt | |
206 | * context, and we also keep do not add cross-context lock | |
207 | * dependencies - the lock usage graph walking covers that area | |
208 | * anyway, and we'd just unnecessarily increase the number of | |
209 | * dependencies otherwise. [Note: hardirq and softirq contexts | |
210 | * are separated from each other too.] | |
211 | * | |
212 | * The following field is used to detect when we cross into an | |
213 | * interrupt context: | |
214 | */ | |
f82b217e DJ |
215 | unsigned int irq_context:2; /* bit 0 - soft, bit 1 - hard */ |
216 | unsigned int trylock:1; | |
217 | unsigned int read:2; /* see lock_acquire() comment */ | |
218 | unsigned int check:2; /* see lock_acquire() comment */ | |
219 | unsigned int hardirqs_off:1; | |
fbb9ce95 IM |
220 | }; |
221 | ||
222 | /* | |
223 | * Initialization, self-test and debugging-output methods: | |
224 | */ | |
225 | extern void lockdep_init(void); | |
226 | extern void lockdep_info(void); | |
227 | extern void lockdep_reset(void); | |
228 | extern void lockdep_reset_lock(struct lockdep_map *lock); | |
229 | extern void lockdep_free_key_range(void *start, unsigned long size); | |
b351d164 | 230 | extern void lockdep_sys_exit(void); |
fbb9ce95 IM |
231 | |
232 | extern void lockdep_off(void); | |
233 | extern void lockdep_on(void); | |
fbb9ce95 IM |
234 | |
235 | /* | |
236 | * These methods are used by specific locking variants (spinlocks, | |
237 | * rwlocks, mutexes and rwsems) to pass init/acquire/release events | |
238 | * to lockdep: | |
239 | */ | |
240 | ||
241 | extern void lockdep_init_map(struct lockdep_map *lock, const char *name, | |
4dfbb9d8 | 242 | struct lock_class_key *key, int subclass); |
fbb9ce95 | 243 | |
851a67b8 PZ |
244 | /* |
245 | * To initialize a lockdep_map statically use this macro. | |
246 | * Note that _name must not be NULL. | |
247 | */ | |
248 | #define STATIC_LOCKDEP_MAP_INIT(_name, _key) \ | |
249 | { .name = (_name), .key = (void *)(_key), } | |
250 | ||
fbb9ce95 IM |
251 | /* |
252 | * Reinitialize a lock key - for cases where there is special locking or | |
253 | * special initialization of locks so that the validator gets the scope | |
254 | * of dependencies wrong: they are either too broad (they need a class-split) | |
255 | * or they are too narrow (they suffer from a false class-split): | |
256 | */ | |
257 | #define lockdep_set_class(lock, key) \ | |
4dfbb9d8 | 258 | lockdep_init_map(&(lock)->dep_map, #key, key, 0) |
fbb9ce95 | 259 | #define lockdep_set_class_and_name(lock, key, name) \ |
4dfbb9d8 PZ |
260 | lockdep_init_map(&(lock)->dep_map, name, key, 0) |
261 | #define lockdep_set_class_and_subclass(lock, key, sub) \ | |
262 | lockdep_init_map(&(lock)->dep_map, #key, key, sub) | |
263 | #define lockdep_set_subclass(lock, sub) \ | |
264 | lockdep_init_map(&(lock)->dep_map, #lock, \ | |
265 | (lock)->dep_map.key, sub) | |
9a7aa12f JK |
266 | /* |
267 | * Compare locking classes | |
268 | */ | |
269 | #define lockdep_match_class(lock, key) lockdep_match_key(&(lock)->dep_map, key) | |
270 | ||
271 | static inline int lockdep_match_key(struct lockdep_map *lock, | |
272 | struct lock_class_key *key) | |
273 | { | |
274 | return lock->key == key; | |
275 | } | |
fbb9ce95 IM |
276 | |
277 | /* | |
278 | * Acquire a lock. | |
279 | * | |
280 | * Values for "read": | |
281 | * | |
282 | * 0: exclusive (write) acquire | |
283 | * 1: read-acquire (no recursion allowed) | |
284 | * 2: read-acquire with same-instance recursion allowed | |
285 | * | |
286 | * Values for check: | |
287 | * | |
288 | * 0: disabled | |
289 | * 1: simple checks (freeing, held-at-exit-time, etc.) | |
290 | * 2: full validation | |
291 | */ | |
292 | extern void lock_acquire(struct lockdep_map *lock, unsigned int subclass, | |
7531e2f3 PZ |
293 | int trylock, int read, int check, |
294 | struct lockdep_map *nest_lock, unsigned long ip); | |
fbb9ce95 IM |
295 | |
296 | extern void lock_release(struct lockdep_map *lock, int nested, | |
297 | unsigned long ip); | |
298 | ||
00ef9f73 PZ |
299 | extern void lock_set_class(struct lockdep_map *lock, const char *name, |
300 | struct lock_class_key *key, unsigned int subclass, | |
301 | unsigned long ip); | |
302 | ||
303 | static inline void lock_set_subclass(struct lockdep_map *lock, | |
304 | unsigned int subclass, unsigned long ip) | |
305 | { | |
306 | lock_set_class(lock, lock->name, lock->key, subclass, ip); | |
307 | } | |
64aa348e | 308 | |
cf40bd16 NP |
309 | extern void lockdep_set_current_reclaim_state(gfp_t gfp_mask); |
310 | extern void lockdep_clear_current_reclaim_state(void); | |
311 | extern void lockdep_trace_alloc(gfp_t mask); | |
312 | ||
313 | # define INIT_LOCKDEP .lockdep_recursion = 0, .lockdep_reclaim_gfp = 0, | |
fbb9ce95 | 314 | |
e3a55fd1 | 315 | #define lockdep_depth(tsk) (debug_locks ? (tsk)->lockdep_depth : 0) |
d5abe669 | 316 | |
fbb9ce95 IM |
317 | #else /* !LOCKDEP */ |
318 | ||
319 | static inline void lockdep_off(void) | |
320 | { | |
321 | } | |
322 | ||
323 | static inline void lockdep_on(void) | |
324 | { | |
325 | } | |
326 | ||
7531e2f3 | 327 | # define lock_acquire(l, s, t, r, c, n, i) do { } while (0) |
fbb9ce95 | 328 | # define lock_release(l, n, i) do { } while (0) |
00ef9f73 | 329 | # define lock_set_class(l, n, k, s, i) do { } while (0) |
64aa348e | 330 | # define lock_set_subclass(l, s, i) do { } while (0) |
cf40bd16 NP |
331 | # define lockdep_set_current_reclaim_state(g) do { } while (0) |
332 | # define lockdep_clear_current_reclaim_state() do { } while (0) | |
333 | # define lockdep_trace_alloc(g) do { } while (0) | |
fbb9ce95 IM |
334 | # define lockdep_init() do { } while (0) |
335 | # define lockdep_info() do { } while (0) | |
e25cf3db IM |
336 | # define lockdep_init_map(lock, name, key, sub) \ |
337 | do { (void)(name); (void)(key); } while (0) | |
fbb9ce95 IM |
338 | # define lockdep_set_class(lock, key) do { (void)(key); } while (0) |
339 | # define lockdep_set_class_and_name(lock, key, name) \ | |
e25cf3db | 340 | do { (void)(key); (void)(name); } while (0) |
4dfbb9d8 PZ |
341 | #define lockdep_set_class_and_subclass(lock, key, sub) \ |
342 | do { (void)(key); } while (0) | |
07646e21 | 343 | #define lockdep_set_subclass(lock, sub) do { } while (0) |
9a7aa12f JK |
344 | /* |
345 | * We don't define lockdep_match_class() and lockdep_match_key() for !LOCKDEP | |
346 | * case since the result is not well defined and the caller should rather | |
347 | * #ifdef the call himself. | |
348 | */ | |
07646e21 | 349 | |
fbb9ce95 IM |
350 | # define INIT_LOCKDEP |
351 | # define lockdep_reset() do { debug_locks = 1; } while (0) | |
352 | # define lockdep_free_key_range(start, size) do { } while (0) | |
b351d164 | 353 | # define lockdep_sys_exit() do { } while (0) |
fbb9ce95 IM |
354 | /* |
355 | * The class key takes no space if lockdep is disabled: | |
356 | */ | |
357 | struct lock_class_key { }; | |
d5abe669 PZ |
358 | |
359 | #define lockdep_depth(tsk) (0) | |
360 | ||
fbb9ce95 IM |
361 | #endif /* !LOCKDEP */ |
362 | ||
f20786ff PZ |
363 | #ifdef CONFIG_LOCK_STAT |
364 | ||
365 | extern void lock_contended(struct lockdep_map *lock, unsigned long ip); | |
c7e78cff | 366 | extern void lock_acquired(struct lockdep_map *lock, unsigned long ip); |
f20786ff PZ |
367 | |
368 | #define LOCK_CONTENDED(_lock, try, lock) \ | |
369 | do { \ | |
370 | if (!try(_lock)) { \ | |
371 | lock_contended(&(_lock)->dep_map, _RET_IP_); \ | |
372 | lock(_lock); \ | |
f20786ff | 373 | } \ |
c7e78cff | 374 | lock_acquired(&(_lock)->dep_map, _RET_IP_); \ |
f20786ff PZ |
375 | } while (0) |
376 | ||
377 | #else /* CONFIG_LOCK_STAT */ | |
378 | ||
379 | #define lock_contended(lockdep_map, ip) do {} while (0) | |
c7e78cff | 380 | #define lock_acquired(lockdep_map, ip) do {} while (0) |
f20786ff PZ |
381 | |
382 | #define LOCK_CONTENDED(_lock, try, lock) \ | |
383 | lock(_lock) | |
384 | ||
385 | #endif /* CONFIG_LOCK_STAT */ | |
386 | ||
e8c158bb RH |
387 | #ifdef CONFIG_LOCKDEP |
388 | ||
389 | /* | |
390 | * On lockdep we dont want the hand-coded irq-enable of | |
391 | * _raw_*_lock_flags() code, because lockdep assumes | |
392 | * that interrupts are not re-enabled during lock-acquire: | |
393 | */ | |
394 | #define LOCK_CONTENDED_FLAGS(_lock, try, lock, lockfl, flags) \ | |
395 | LOCK_CONTENDED((_lock), (try), (lock)) | |
396 | ||
397 | #else /* CONFIG_LOCKDEP */ | |
398 | ||
399 | #define LOCK_CONTENDED_FLAGS(_lock, try, lock, lockfl, flags) \ | |
400 | lockfl((_lock), (flags)) | |
401 | ||
402 | #endif /* CONFIG_LOCKDEP */ | |
403 | ||
74c8a613 | 404 | #ifdef CONFIG_GENERIC_HARDIRQS |
243c7621 IM |
405 | extern void early_init_irq_lock_class(void); |
406 | #else | |
3117df04 IM |
407 | static inline void early_init_irq_lock_class(void) |
408 | { | |
409 | } | |
243c7621 IM |
410 | #endif |
411 | ||
fbb9ce95 IM |
412 | #ifdef CONFIG_TRACE_IRQFLAGS |
413 | extern void early_boot_irqs_off(void); | |
414 | extern void early_boot_irqs_on(void); | |
3117df04 | 415 | extern void print_irqtrace_events(struct task_struct *curr); |
fbb9ce95 | 416 | #else |
3117df04 IM |
417 | static inline void early_boot_irqs_off(void) |
418 | { | |
419 | } | |
420 | static inline void early_boot_irqs_on(void) | |
421 | { | |
422 | } | |
423 | static inline void print_irqtrace_events(struct task_struct *curr) | |
424 | { | |
425 | } | |
fbb9ce95 IM |
426 | #endif |
427 | ||
428 | /* | |
429 | * For trivial one-depth nesting of a lock-class, the following | |
430 | * global define can be used. (Subsystems with multiple levels | |
431 | * of nesting should define their own lock-nesting subclasses.) | |
432 | */ | |
433 | #define SINGLE_DEPTH_NESTING 1 | |
434 | ||
435 | /* | |
436 | * Map the dependency ops to NOP or to real lockdep ops, depending | |
437 | * on the per lock-class debug mode: | |
438 | */ | |
439 | ||
440 | #ifdef CONFIG_DEBUG_LOCK_ALLOC | |
441 | # ifdef CONFIG_PROVE_LOCKING | |
7531e2f3 | 442 | # define spin_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 2, NULL, i) |
b7d39aff | 443 | # define spin_acquire_nest(l, s, t, n, i) lock_acquire(l, s, t, 0, 2, n, i) |
fbb9ce95 | 444 | # else |
7531e2f3 | 445 | # define spin_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 1, NULL, i) |
b7d39aff | 446 | # define spin_acquire_nest(l, s, t, n, i) lock_acquire(l, s, t, 0, 1, NULL, i) |
fbb9ce95 IM |
447 | # endif |
448 | # define spin_release(l, n, i) lock_release(l, n, i) | |
449 | #else | |
450 | # define spin_acquire(l, s, t, i) do { } while (0) | |
451 | # define spin_release(l, n, i) do { } while (0) | |
452 | #endif | |
453 | ||
454 | #ifdef CONFIG_DEBUG_LOCK_ALLOC | |
455 | # ifdef CONFIG_PROVE_LOCKING | |
7531e2f3 PZ |
456 | # define rwlock_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 2, NULL, i) |
457 | # define rwlock_acquire_read(l, s, t, i) lock_acquire(l, s, t, 2, 2, NULL, i) | |
fbb9ce95 | 458 | # else |
7531e2f3 PZ |
459 | # define rwlock_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 1, NULL, i) |
460 | # define rwlock_acquire_read(l, s, t, i) lock_acquire(l, s, t, 2, 1, NULL, i) | |
fbb9ce95 IM |
461 | # endif |
462 | # define rwlock_release(l, n, i) lock_release(l, n, i) | |
463 | #else | |
464 | # define rwlock_acquire(l, s, t, i) do { } while (0) | |
465 | # define rwlock_acquire_read(l, s, t, i) do { } while (0) | |
466 | # define rwlock_release(l, n, i) do { } while (0) | |
467 | #endif | |
468 | ||
469 | #ifdef CONFIG_DEBUG_LOCK_ALLOC | |
470 | # ifdef CONFIG_PROVE_LOCKING | |
7531e2f3 | 471 | # define mutex_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 2, NULL, i) |
fbb9ce95 | 472 | # else |
7531e2f3 | 473 | # define mutex_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 1, NULL, i) |
fbb9ce95 IM |
474 | # endif |
475 | # define mutex_release(l, n, i) lock_release(l, n, i) | |
476 | #else | |
477 | # define mutex_acquire(l, s, t, i) do { } while (0) | |
478 | # define mutex_release(l, n, i) do { } while (0) | |
479 | #endif | |
480 | ||
481 | #ifdef CONFIG_DEBUG_LOCK_ALLOC | |
482 | # ifdef CONFIG_PROVE_LOCKING | |
7531e2f3 PZ |
483 | # define rwsem_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 2, NULL, i) |
484 | # define rwsem_acquire_read(l, s, t, i) lock_acquire(l, s, t, 1, 2, NULL, i) | |
fbb9ce95 | 485 | # else |
7531e2f3 PZ |
486 | # define rwsem_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 1, NULL, i) |
487 | # define rwsem_acquire_read(l, s, t, i) lock_acquire(l, s, t, 1, 1, NULL, i) | |
fbb9ce95 IM |
488 | # endif |
489 | # define rwsem_release(l, n, i) lock_release(l, n, i) | |
490 | #else | |
491 | # define rwsem_acquire(l, s, t, i) do { } while (0) | |
492 | # define rwsem_acquire_read(l, s, t, i) do { } while (0) | |
493 | # define rwsem_release(l, n, i) do { } while (0) | |
494 | #endif | |
495 | ||
4f3e7524 PZ |
496 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
497 | # ifdef CONFIG_PROVE_LOCKING | |
3295f0ef | 498 | # define lock_map_acquire(l) lock_acquire(l, 0, 0, 0, 2, NULL, _THIS_IP_) |
4f3e7524 | 499 | # else |
3295f0ef | 500 | # define lock_map_acquire(l) lock_acquire(l, 0, 0, 0, 1, NULL, _THIS_IP_) |
4f3e7524 | 501 | # endif |
3295f0ef | 502 | # define lock_map_release(l) lock_release(l, 1, _THIS_IP_) |
4f3e7524 | 503 | #else |
3295f0ef IM |
504 | # define lock_map_acquire(l) do { } while (0) |
505 | # define lock_map_release(l) do { } while (0) | |
4f3e7524 PZ |
506 | #endif |
507 | ||
76b189e9 PZ |
508 | #ifdef CONFIG_PROVE_LOCKING |
509 | # define might_lock(lock) \ | |
510 | do { \ | |
511 | typecheck(struct lockdep_map *, &(lock)->dep_map); \ | |
512 | lock_acquire(&(lock)->dep_map, 0, 0, 0, 2, NULL, _THIS_IP_); \ | |
513 | lock_release(&(lock)->dep_map, 0, _THIS_IP_); \ | |
514 | } while (0) | |
515 | # define might_lock_read(lock) \ | |
516 | do { \ | |
517 | typecheck(struct lockdep_map *, &(lock)->dep_map); \ | |
518 | lock_acquire(&(lock)->dep_map, 0, 0, 1, 2, NULL, _THIS_IP_); \ | |
519 | lock_release(&(lock)->dep_map, 0, _THIS_IP_); \ | |
520 | } while (0) | |
521 | #else | |
522 | # define might_lock(lock) do { } while (0) | |
523 | # define might_lock_read(lock) do { } while (0) | |
524 | #endif | |
525 | ||
fbb9ce95 | 526 | #endif /* __LINUX_LOCKDEP_H */ |