1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * Runtime locking correctness validator
4 *
5 * Copyright (C) 2006,2007 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
6 * Copyright (C) 2007 Red Hat, Inc., Peter Zijlstra
7 *
8 * see Documentation/locking/lockdep-design.rst for more details.
9 */
10 #ifndef __LINUX_LOCKDEP_H
11 #define __LINUX_LOCKDEP_H
12
13 #include <linux/lockdep_types.h>
14 #include <linux/smp.h>
15 #include <asm/percpu.h>
16
17 struct task_struct;
18
19 #ifdef CONFIG_LOCKDEP
20
21 #include <linux/linkage.h>
22 #include <linux/list.h>
23 #include <linux/debug_locks.h>
24 #include <linux/stacktrace.h>
25
lockdep_copy_map(struct lockdep_map * to,struct lockdep_map * from)26 static inline void lockdep_copy_map(struct lockdep_map *to,
27 struct lockdep_map *from)
28 {
29 int i;
30
31 *to = *from;
32 /*
33 * Since the class cache can be modified concurrently we could observe
34 * half pointers (64bit arch using 32bit copy insns). Therefore clear
35 * the caches and take the performance hit.
36 *
37 * XXX it doesn't work well with lockdep_set_class_and_subclass(), since
38 * that relies on cache abuse.
39 */
40 for (i = 0; i < NR_LOCKDEP_CACHING_CLASSES; i++)
41 to->class_cache[i] = NULL;
42 }
43
44 /*
45 * Every lock has a list of other locks that were taken after it.
46 * We only grow the list, never remove from it:
47 */
48 struct lock_list {
49 struct list_head entry;
50 struct lock_class *class;
51 struct lock_class *links_to;
52 const struct lock_trace *trace;
53 u16 distance;
54 /* bitmap of different dependencies from head to this */
55 u8 dep;
56 /* used by BFS to record whether "prev -> this" only has -(*R)-> */
57 u8 only_xr;
58
59 /*
60 * The parent field is used to implement breadth-first search, and the
61 * bit 0 is reused to indicate if the lock has been accessed in BFS.
62 */
63 struct lock_list *parent;
64 };
65
66 /**
67 * struct lock_chain - lock dependency chain record
68 *
69 * @irq_context: the same as irq_context in held_lock below
70 * @depth: the number of held locks in this chain
71 * @base: the index in chain_hlocks for this chain
72 * @entry: the collided lock chains in lock_chain hash list
73 * @chain_key: the hash key of this lock_chain
74 */
75 struct lock_chain {
76 /* see BUILD_BUG_ON()s in add_chain_cache() */
77 unsigned int irq_context : 2,
78 depth : 6,
79 base : 24;
80 /* 4 byte hole */
81 struct hlist_node entry;
82 u64 chain_key;
83 };
84
85 /*
86 * Initialization, self-test and debugging-output methods:
87 */
88 extern void lockdep_init(void);
89 extern void lockdep_reset(void);
90 extern void lockdep_reset_lock(struct lockdep_map *lock);
91 extern void lockdep_free_key_range(void *start, unsigned long size);
92 extern asmlinkage void lockdep_sys_exit(void);
93 extern void lockdep_set_selftest_task(struct task_struct *task);
94
95 extern void lockdep_init_task(struct task_struct *task);
96
97 /*
98 * Split the recursion counter in two to readily detect 'off' vs recursion.
99 */
100 #define LOCKDEP_RECURSION_BITS 16
101 #define LOCKDEP_OFF (1U << LOCKDEP_RECURSION_BITS)
102 #define LOCKDEP_RECURSION_MASK (LOCKDEP_OFF - 1)
103
104 /*
105 * lockdep_{off,on}() are macros to avoid tracing and kprobes; not inlines due
106 * to header dependencies.
107 */
108
109 #define lockdep_off() \
110 do { \
111 current->lockdep_recursion += LOCKDEP_OFF; \
112 } while (0)
113
114 #define lockdep_on() \
115 do { \
116 current->lockdep_recursion -= LOCKDEP_OFF; \
117 } while (0)
118
119 extern void lockdep_register_key(struct lock_class_key *key);
120 extern void lockdep_unregister_key(struct lock_class_key *key);
121
122 /*
123 * These methods are used by specific locking variants (spinlocks,
124 * rwlocks, mutexes and rwsems) to pass init/acquire/release events
125 * to lockdep:
126 */
127
128 extern void lockdep_init_map_type(struct lockdep_map *lock, const char *name,
129 struct lock_class_key *key, int subclass, u8 inner, u8 outer, u8 lock_type);
130
131 static inline void
lockdep_init_map_waits(struct lockdep_map * lock,const char * name,struct lock_class_key * key,int subclass,u8 inner,u8 outer)132 lockdep_init_map_waits(struct lockdep_map *lock, const char *name,
133 struct lock_class_key *key, int subclass, u8 inner, u8 outer)
134 {
135 lockdep_init_map_type(lock, name, key, subclass, inner, outer, LD_LOCK_NORMAL);
136 }
137
138 static inline void
lockdep_init_map_wait(struct lockdep_map * lock,const char * name,struct lock_class_key * key,int subclass,u8 inner)139 lockdep_init_map_wait(struct lockdep_map *lock, const char *name,
140 struct lock_class_key *key, int subclass, u8 inner)
141 {
142 lockdep_init_map_waits(lock, name, key, subclass, inner, LD_WAIT_INV);
143 }
144
lockdep_init_map(struct lockdep_map * lock,const char * name,struct lock_class_key * key,int subclass)145 static inline void lockdep_init_map(struct lockdep_map *lock, const char *name,
146 struct lock_class_key *key, int subclass)
147 {
148 lockdep_init_map_wait(lock, name, key, subclass, LD_WAIT_INV);
149 }
150
151 /*
152 * Reinitialize a lock key - for cases where there is special locking or
153 * special initialization of locks so that the validator gets the scope
154 * of dependencies wrong: they are either too broad (they need a class-split)
155 * or they are too narrow (they suffer from a false class-split):
156 */
157 #define lockdep_set_class(lock, key) \
158 lockdep_init_map_type(&(lock)->dep_map, #key, key, 0, \
159 (lock)->dep_map.wait_type_inner, \
160 (lock)->dep_map.wait_type_outer, \
161 (lock)->dep_map.lock_type)
162
163 #define lockdep_set_class_and_name(lock, key, name) \
164 lockdep_init_map_type(&(lock)->dep_map, name, key, 0, \
165 (lock)->dep_map.wait_type_inner, \
166 (lock)->dep_map.wait_type_outer, \
167 (lock)->dep_map.lock_type)
168
169 #define lockdep_set_class_and_subclass(lock, key, sub) \
170 lockdep_init_map_type(&(lock)->dep_map, #key, key, sub, \
171 (lock)->dep_map.wait_type_inner, \
172 (lock)->dep_map.wait_type_outer, \
173 (lock)->dep_map.lock_type)
174
175 #define lockdep_set_subclass(lock, sub) \
176 lockdep_init_map_type(&(lock)->dep_map, (lock)->dep_map.name, (lock)->dep_map.key, sub,\
177 (lock)->dep_map.wait_type_inner, \
178 (lock)->dep_map.wait_type_outer, \
179 (lock)->dep_map.lock_type)
180
181 /**
182 * lockdep_set_novalidate_class: disable checking of lock ordering on a given
183 * lock
184 * @lock: Lock to mark
185 *
186 * Lockdep will still record that this lock has been taken, and print held
187 * instances when dumping locks
188 */
189 #define lockdep_set_novalidate_class(lock) \
190 lockdep_set_class_and_name(lock, &__lockdep_no_validate__, #lock)
191
192 /**
193 * lockdep_set_notrack_class: disable lockdep tracking of a given lock entirely
194 * @lock: Lock to mark
195 *
196 * Bigger hammer than lockdep_set_novalidate_class: so far just for bcachefs,
197 * which takes more locks than lockdep is able to track (48).
198 */
199 #define lockdep_set_notrack_class(lock) \
200 lockdep_set_class_and_name(lock, &__lockdep_no_track__, #lock)
201
202 /*
203 * Compare locking classes
204 */
205 #define lockdep_match_class(lock, key) lockdep_match_key(&(lock)->dep_map, key)
206
lockdep_match_key(struct lockdep_map * lock,struct lock_class_key * key)207 static inline int lockdep_match_key(struct lockdep_map *lock,
208 struct lock_class_key *key)
209 {
210 return lock->key == key;
211 }
212
213 /*
214 * Acquire a lock.
215 *
216 * Values for "read":
217 *
218 * 0: exclusive (write) acquire
219 * 1: read-acquire (no recursion allowed)
220 * 2: read-acquire with same-instance recursion allowed
221 *
222 * Values for check:
223 *
224 * 0: simple checks (freeing, held-at-exit-time, etc.)
225 * 1: full validation
226 */
227 extern void lock_acquire(struct lockdep_map *lock, unsigned int subclass,
228 int trylock, int read, int check,
229 struct lockdep_map *nest_lock, unsigned long ip);
230
231 extern void lock_release(struct lockdep_map *lock, unsigned long ip);
232
233 extern void lock_sync(struct lockdep_map *lock, unsigned int subclass,
234 int read, int check, struct lockdep_map *nest_lock,
235 unsigned long ip);
236
237 /* lock_is_held_type() returns */
238 #define LOCK_STATE_UNKNOWN -1
239 #define LOCK_STATE_NOT_HELD 0
240 #define LOCK_STATE_HELD 1
241
242 /*
243 * Same "read" as for lock_acquire(), except -1 means any.
244 */
245 extern int lock_is_held_type(const struct lockdep_map *lock, int read);
246
lock_is_held(const struct lockdep_map * lock)247 static inline int lock_is_held(const struct lockdep_map *lock)
248 {
249 return lock_is_held_type(lock, -1);
250 }
251
252 #define lockdep_is_held(lock) lock_is_held(&(lock)->dep_map)
253 #define lockdep_is_held_type(lock, r) lock_is_held_type(&(lock)->dep_map, (r))
254
255 extern void lock_set_class(struct lockdep_map *lock, const char *name,
256 struct lock_class_key *key, unsigned int subclass,
257 unsigned long ip);
258
259 #define lock_set_novalidate_class(l, n, i) \
260 lock_set_class(l, n, &__lockdep_no_validate__, 0, i)
261
lock_set_subclass(struct lockdep_map * lock,unsigned int subclass,unsigned long ip)262 static inline void lock_set_subclass(struct lockdep_map *lock,
263 unsigned int subclass, unsigned long ip)
264 {
265 lock_set_class(lock, lock->name, lock->key, subclass, ip);
266 }
267
268 extern void lock_downgrade(struct lockdep_map *lock, unsigned long ip);
269
270 #define NIL_COOKIE (struct pin_cookie){ .val = 0U, }
271
272 extern struct pin_cookie lock_pin_lock(struct lockdep_map *lock);
273 extern void lock_repin_lock(struct lockdep_map *lock, struct pin_cookie);
274 extern void lock_unpin_lock(struct lockdep_map *lock, struct pin_cookie);
275
276 extern u32 lock_sequence(struct lockdep_map *lock);
277 #define lockdep_sequence(lock) lock_sequence(&(lock)->dep_map)
278
279 #define lockdep_depth(tsk) (debug_locks ? (tsk)->lockdep_depth : 0)
280
281 #define lockdep_assert(cond) \
282 do { WARN_ON(debug_locks && !(cond)); } while (0)
283
284 #define lockdep_assert_once(cond) \
285 do { WARN_ON_ONCE(debug_locks && !(cond)); } while (0)
286
287 #define lockdep_assert_held(l) \
288 do { lockdep_assert(lockdep_is_held(l) != LOCK_STATE_NOT_HELD); __assume_ctx_lock(l); } while (0)
289
290 #define lockdep_assert_not_held(l) \
291 lockdep_assert(lockdep_is_held(l) != LOCK_STATE_HELD)
292
293 #define lockdep_assert_held_write(l) \
294 do { lockdep_assert(lockdep_is_held_type(l, 0)); __assume_ctx_lock(l); } while (0)
295
296 #define lockdep_assert_held_read(l) \
297 do { lockdep_assert(lockdep_is_held_type(l, 1)); __assume_shared_ctx_lock(l); } while (0)
298
299 #define lockdep_assert_held_once(l) \
300 lockdep_assert_once(lockdep_is_held(l) != LOCK_STATE_NOT_HELD)
301
302 #define lockdep_assert_none_held_once() \
303 lockdep_assert_once(!current->lockdep_depth)
304
305 #define lockdep_recursing(tsk) ((tsk)->lockdep_recursion)
306
307 #define lockdep_pin_lock(l) lock_pin_lock(&(l)->dep_map)
308 #define lockdep_repin_lock(l,c) lock_repin_lock(&(l)->dep_map, (c))
309 #define lockdep_unpin_lock(l,c) lock_unpin_lock(&(l)->dep_map, (c))
310
311 /*
312 * Must use lock_map_aquire_try() with override maps to avoid
313 * lockdep thinking they participate in the block chain.
314 */
315 #define DEFINE_WAIT_OVERRIDE_MAP(_name, _wait_type) \
316 struct lockdep_map _name = { \
317 .name = #_name "-wait-type-override", \
318 .wait_type_inner = _wait_type, \
319 .lock_type = LD_LOCK_WAIT_OVERRIDE, }
320
321 #else /* !CONFIG_LOCKDEP */
322
lockdep_init_task(struct task_struct * task)323 static inline void lockdep_init_task(struct task_struct *task)
324 {
325 }
326
lockdep_off(void)327 static inline void lockdep_off(void)
328 {
329 }
330
lockdep_on(void)331 static inline void lockdep_on(void)
332 {
333 }
334
lockdep_set_selftest_task(struct task_struct * task)335 static inline void lockdep_set_selftest_task(struct task_struct *task)
336 {
337 }
338
339 # define lock_acquire(l, s, t, r, c, n, i) do { } while (0)
340 # define lock_release(l, i) do { } while (0)
341 # define lock_downgrade(l, i) do { } while (0)
342 # define lock_set_class(l, n, key, s, i) do { (void)(key); } while (0)
343 # define lock_set_novalidate_class(l, n, i) do { } while (0)
344 # define lock_set_subclass(l, s, i) do { } while (0)
345 # define lockdep_init() do { } while (0)
346 # define lockdep_init_map_type(lock, name, key, sub, inner, outer, type) \
347 do { (void)(name); (void)(key); } while (0)
348 # define lockdep_init_map_waits(lock, name, key, sub, inner, outer) \
349 do { (void)(name); (void)(key); } while (0)
350 # define lockdep_init_map_wait(lock, name, key, sub, inner) \
351 do { (void)(name); (void)(key); } while (0)
352 # define lockdep_init_map(lock, name, key, sub) \
353 do { (void)(name); (void)(key); } while (0)
354 # define lockdep_set_class(lock, key) do { (void)(key); } while (0)
355 # define lockdep_set_class_and_name(lock, key, name) \
356 do { (void)(key); (void)(name); } while (0)
357 #define lockdep_set_class_and_subclass(lock, key, sub) \
358 do { (void)(key); } while (0)
359 #define lockdep_set_subclass(lock, sub) do { } while (0)
360
361 #define lockdep_set_novalidate_class(lock) do { } while (0)
362 #define lockdep_set_notrack_class(lock) do { } while (0)
363
364 /*
365 * We don't define lockdep_match_class() and lockdep_match_key() for !LOCKDEP
366 * case since the result is not well defined and the caller should rather
367 * #ifdef the call himself.
368 */
369
370 # define lockdep_reset() do { debug_locks = 1; } while (0)
371 # define lockdep_free_key_range(start, size) do { } while (0)
372 # define lockdep_sys_exit() do { } while (0)
373
lockdep_register_key(struct lock_class_key * key)374 static inline void lockdep_register_key(struct lock_class_key *key)
375 {
376 }
377
lockdep_unregister_key(struct lock_class_key * key)378 static inline void lockdep_unregister_key(struct lock_class_key *key)
379 {
380 }
381
382 #define lockdep_depth(tsk) (0)
383
384 /*
385 * Dummy forward declarations, allow users to write less ifdef-y code
386 * and depend on dead code elimination.
387 */
388 extern int lock_is_held(const void *);
389 extern int lockdep_is_held(const void *);
390 #define lockdep_is_held_type(l, r) (1)
391
392 #define lockdep_assert(c) do { } while (0)
393 #define lockdep_assert_once(c) do { } while (0)
394
395 #define lockdep_assert_held(l) __assume_ctx_lock(l)
396 #define lockdep_assert_not_held(l) do { (void)(l); } while (0)
397 #define lockdep_assert_held_write(l) __assume_ctx_lock(l)
398 #define lockdep_assert_held_read(l) __assume_shared_ctx_lock(l)
399 #define lockdep_assert_held_once(l) do { (void)(l); } while (0)
400 #define lockdep_assert_none_held_once() do { } while (0)
401
402 #define lockdep_recursing(tsk) (0)
403
404 #define NIL_COOKIE (struct pin_cookie){ }
405
406 #define lockdep_pin_lock(l) ({ struct pin_cookie cookie = { }; cookie; })
407 #define lockdep_repin_lock(l, c) do { (void)(l); (void)(c); } while (0)
408 #define lockdep_unpin_lock(l, c) do { (void)(l); (void)(c); } while (0)
409
410 #define DEFINE_WAIT_OVERRIDE_MAP(_name, _wait_type) \
411 struct lockdep_map __maybe_unused _name = {}
412
413 #endif /* !LOCKDEP */
414
415 #ifdef CONFIG_PROVE_LOCKING
416 void lockdep_set_lock_cmp_fn(struct lockdep_map *, lock_cmp_fn, lock_print_fn);
417
418 #define lock_set_cmp_fn(lock, ...) lockdep_set_lock_cmp_fn(&(lock)->dep_map, __VA_ARGS__)
419 #else
420 #define lock_set_cmp_fn(lock, ...) do { } while (0)
421 #endif
422
423 enum xhlock_context_t {
424 XHLOCK_HARD,
425 XHLOCK_SOFT,
426 XHLOCK_CTX_NR,
427 };
428
429 /*
430 * To initialize a lockdep_map statically use this macro.
431 * Note that _name must not be NULL.
432 */
433 #define STATIC_LOCKDEP_MAP_INIT(_name, _key) \
434 { .name = (_name), .key = (void *)(_key), }
435
lockdep_invariant_state(bool force)436 static inline void lockdep_invariant_state(bool force) {}
lockdep_free_task(struct task_struct * task)437 static inline void lockdep_free_task(struct task_struct *task) {}
438
439 #ifdef CONFIG_LOCK_STAT
440
441 extern void lock_contended(struct lockdep_map *lock, unsigned long ip);
442 extern void lock_acquired(struct lockdep_map *lock, unsigned long ip);
443
444 #define LOCK_CONTENDED(_lock, try, lock) \
445 do { \
446 if (!try(_lock)) { \
447 lock_contended(&(_lock)->dep_map, _RET_IP_); \
448 lock(_lock); \
449 } \
450 lock_acquired(&(_lock)->dep_map, _RET_IP_); \
451 } while (0)
452
453 #define LOCK_CONTENDED_RETURN(_lock, try, lock) \
454 ({ \
455 int ____err = 0; \
456 if (!try(_lock)) { \
457 lock_contended(&(_lock)->dep_map, _RET_IP_); \
458 ____err = lock(_lock); \
459 } \
460 if (!____err) \
461 lock_acquired(&(_lock)->dep_map, _RET_IP_); \
462 ____err; \
463 })
464
465 #else /* CONFIG_LOCK_STAT */
466
467 #define lock_contended(lockdep_map, ip) do {} while (0)
468 #define lock_acquired(lockdep_map, ip) do {} while (0)
469
470 #define LOCK_CONTENDED(_lock, try, lock) \
471 lock(_lock)
472
473 #define LOCK_CONTENDED_RETURN(_lock, try, lock) \
474 lock(_lock)
475
476 #endif /* CONFIG_LOCK_STAT */
477
478 #ifdef CONFIG_PROVE_LOCKING
479 extern void print_irqtrace_events(struct task_struct *curr);
480 #else
print_irqtrace_events(struct task_struct * curr)481 static inline void print_irqtrace_events(struct task_struct *curr)
482 {
483 }
484 #endif
485
486 /* Variable used to make lockdep treat read_lock() as recursive in selftests */
487 #ifdef CONFIG_DEBUG_LOCKING_API_SELFTESTS
488 extern unsigned int force_read_lock_recursive;
489 #else /* CONFIG_DEBUG_LOCKING_API_SELFTESTS */
490 #define force_read_lock_recursive 0
491 #endif /* CONFIG_DEBUG_LOCKING_API_SELFTESTS */
492
493 #ifdef CONFIG_LOCKDEP
494 extern bool read_lock_is_recursive(void);
495 #else /* CONFIG_LOCKDEP */
496 /* If !LOCKDEP, the value is meaningless */
497 #define read_lock_is_recursive() 0
498 #endif
499
500 /*
501 * For trivial one-depth nesting of a lock-class, the following
502 * global define can be used. (Subsystems with multiple levels
503 * of nesting should define their own lock-nesting subclasses.)
504 */
505 #define SINGLE_DEPTH_NESTING 1
506
507 /*
508 * Map the dependency ops to NOP or to real lockdep ops, depending
509 * on the per lock-class debug mode:
510 */
511
512 #define lock_acquire_exclusive(l, s, t, n, i) lock_acquire(l, s, t, 0, 1, n, i)
513 #define lock_acquire_shared(l, s, t, n, i) lock_acquire(l, s, t, 1, 1, n, i)
514 #define lock_acquire_shared_recursive(l, s, t, n, i) lock_acquire(l, s, t, 2, 1, n, i)
515
516 #define spin_acquire(l, s, t, i) lock_acquire_exclusive(l, s, t, NULL, i)
517 #define spin_acquire_nest(l, s, t, n, i) lock_acquire_exclusive(l, s, t, n, i)
518 #define spin_release(l, i) lock_release(l, i)
519
520 #define rwlock_acquire(l, s, t, i) lock_acquire_exclusive(l, s, t, NULL, i)
521 #define rwlock_acquire_read(l, s, t, i) \
522 do { \
523 if (read_lock_is_recursive()) \
524 lock_acquire_shared_recursive(l, s, t, NULL, i); \
525 else \
526 lock_acquire_shared(l, s, t, NULL, i); \
527 } while (0)
528
529 #define rwlock_release(l, i) lock_release(l, i)
530
531 #define seqcount_acquire(l, s, t, i) lock_acquire_exclusive(l, s, t, NULL, i)
532 #define seqcount_acquire_read(l, s, t, i) lock_acquire_shared_recursive(l, s, t, NULL, i)
533 #define seqcount_release(l, i) lock_release(l, i)
534
535 #define mutex_acquire(l, s, t, i) lock_acquire_exclusive(l, s, t, NULL, i)
536 #define mutex_acquire_nest(l, s, t, n, i) lock_acquire_exclusive(l, s, t, n, i)
537 #define mutex_release(l, i) lock_release(l, i)
538
539 #define rwsem_acquire(l, s, t, i) lock_acquire_exclusive(l, s, t, NULL, i)
540 #define rwsem_acquire_nest(l, s, t, n, i) lock_acquire_exclusive(l, s, t, n, i)
541 #define rwsem_acquire_read(l, s, t, i) lock_acquire_shared(l, s, t, NULL, i)
542 #define rwsem_release(l, i) lock_release(l, i)
543
544 #define lock_map_acquire(l) lock_acquire_exclusive(l, 0, 0, NULL, _THIS_IP_)
545 #define lock_map_acquire_try(l) lock_acquire_exclusive(l, 0, 1, NULL, _THIS_IP_)
546 #define lock_map_acquire_read(l) lock_acquire_shared_recursive(l, 0, 0, NULL, _THIS_IP_)
547 #define lock_map_acquire_tryread(l) lock_acquire_shared_recursive(l, 0, 1, NULL, _THIS_IP_)
548 #define lock_map_release(l) lock_release(l, _THIS_IP_)
549 #define lock_map_sync(l) lock_sync(l, 0, 0, 1, NULL, _THIS_IP_)
550
551 #ifdef CONFIG_PROVE_LOCKING
552 # define might_lock(lock) \
553 do { \
554 typecheck(struct lockdep_map *, &(lock)->dep_map); \
555 lock_acquire(&(lock)->dep_map, 0, 0, 0, 1, NULL, _THIS_IP_); \
556 lock_release(&(lock)->dep_map, _THIS_IP_); \
557 } while (0)
558 # define might_lock_read(lock) \
559 do { \
560 typecheck(struct lockdep_map *, &(lock)->dep_map); \
561 lock_acquire(&(lock)->dep_map, 0, 0, 1, 1, NULL, _THIS_IP_); \
562 lock_release(&(lock)->dep_map, _THIS_IP_); \
563 } while (0)
564 # define might_lock_nested(lock, subclass) \
565 do { \
566 typecheck(struct lockdep_map *, &(lock)->dep_map); \
567 lock_acquire(&(lock)->dep_map, subclass, 0, 1, 1, NULL, \
568 _THIS_IP_); \
569 lock_release(&(lock)->dep_map, _THIS_IP_); \
570 } while (0)
571
572 DECLARE_PER_CPU(int, hardirqs_enabled);
573 DECLARE_PER_CPU(int, hardirq_context);
574 DECLARE_PER_CPU(unsigned int, lockdep_recursion);
575
576 #define __lockdep_enabled (debug_locks && !this_cpu_read(lockdep_recursion))
577
578 #define lockdep_assert_irqs_enabled() \
579 do { \
580 WARN_ON_ONCE(__lockdep_enabled && !this_cpu_read(hardirqs_enabled)); \
581 } while (0)
582
583 #define lockdep_assert_irqs_disabled() \
584 do { \
585 WARN_ON_ONCE(__lockdep_enabled && this_cpu_read(hardirqs_enabled)); \
586 } while (0)
587
588 #define lockdep_assert_in_irq() \
589 do { \
590 WARN_ON_ONCE(__lockdep_enabled && !this_cpu_read(hardirq_context)); \
591 } while (0)
592
593 #define lockdep_assert_no_hardirq() \
594 do { \
595 WARN_ON_ONCE(__lockdep_enabled && (this_cpu_read(hardirq_context) || \
596 !this_cpu_read(hardirqs_enabled))); \
597 } while (0)
598
599 #define lockdep_assert_preemption_enabled() \
600 do { \
601 WARN_ON_ONCE(IS_ENABLED(CONFIG_PREEMPT_COUNT) && \
602 __lockdep_enabled && \
603 (preempt_count() != 0 || \
604 !this_cpu_read(hardirqs_enabled))); \
605 } while (0)
606
607 #define lockdep_assert_preemption_disabled() \
608 do { \
609 WARN_ON_ONCE(IS_ENABLED(CONFIG_PREEMPT_COUNT) && \
610 __lockdep_enabled && \
611 (preempt_count() == 0 && \
612 this_cpu_read(hardirqs_enabled))); \
613 } while (0)
614
615 /*
616 * Acceptable for protecting per-CPU resources accessed from BH.
617 * Much like in_softirq() - semantics are ambiguous, use carefully.
618 */
619 #define lockdep_assert_in_softirq() \
620 do { \
621 WARN_ON_ONCE(__lockdep_enabled && \
622 (!in_softirq() || in_hardirq() || in_nmi())); \
623 } while (0)
624
625 extern void lockdep_assert_in_softirq_func(void);
626
627 #else
628 # define might_lock(lock) do { } while (0)
629 # define might_lock_read(lock) do { } while (0)
630 # define might_lock_nested(lock, subclass) do { } while (0)
631
632 # define lockdep_assert_irqs_enabled() do { } while (0)
633 # define lockdep_assert_irqs_disabled() do { } while (0)
634 # define lockdep_assert_in_irq() do { } while (0)
635 # define lockdep_assert_no_hardirq() do { } while (0)
636
637 # define lockdep_assert_preemption_enabled() do { } while (0)
638 # define lockdep_assert_preemption_disabled() do { } while (0)
639 # define lockdep_assert_in_softirq() do { } while (0)
640 # define lockdep_assert_in_softirq_func() do { } while (0)
641 #endif
642
643 #ifdef CONFIG_PROVE_RAW_LOCK_NESTING
644
645 # define lockdep_assert_RT_in_threaded_ctx() do { \
646 WARN_ONCE(debug_locks && !current->lockdep_recursion && \
647 lockdep_hardirq_context() && \
648 !(current->hardirq_threaded || current->irq_config), \
649 "Not in threaded context on PREEMPT_RT as expected\n"); \
650 } while (0)
651
652 #else
653
654 # define lockdep_assert_RT_in_threaded_ctx() do { } while (0)
655
656 #endif
657
658 #ifdef CONFIG_LOCKDEP
659 void lockdep_rcu_suspicious(const char *file, const int line, const char *s);
660 #else
661 static inline void
lockdep_rcu_suspicious(const char * file,const int line,const char * s)662 lockdep_rcu_suspicious(const char *file, const int line, const char *s)
663 {
664 }
665 #endif
666
667 #endif /* __LINUX_LOCKDEP_H */
668