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Linux/include/linux/lockdep.h

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  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 /* for sysctl */
 20 extern int prove_locking;
 21 extern int lock_stat;
 22 
 23 #ifdef CONFIG_LOCKDEP
 24 
 25 #include <linux/linkage.h>
 26 #include <linux/list.h>
 27 #include <linux/debug_locks.h>
 28 #include <linux/stacktrace.h>
 29 
 30 static inline void lockdep_copy_map(struct lockdep_map *to,
 31                                     struct lockdep_map *from)
 32 {
 33         int i;
 34 
 35         *to = *from;
 36         /*
 37          * Since the class cache can be modified concurrently we could observe
 38          * half pointers (64bit arch using 32bit copy insns). Therefore clear
 39          * the caches and take the performance hit.
 40          *
 41          * XXX it doesn't work well with lockdep_set_class_and_subclass(), since
 42          *     that relies on cache abuse.
 43          */
 44         for (i = 0; i < NR_LOCKDEP_CACHING_CLASSES; i++)
 45                 to->class_cache[i] = NULL;
 46 }
 47 
 48 /*
 49  * Every lock has a list of other locks that were taken after it.
 50  * We only grow the list, never remove from it:
 51  */
 52 struct lock_list {
 53         struct list_head                entry;
 54         struct lock_class               *class;
 55         struct lock_class               *links_to;
 56         const struct lock_trace         *trace;
 57         u16                             distance;
 58         /* bitmap of different dependencies from head to this */
 59         u8                              dep;
 60         /* used by BFS to record whether "prev -> this" only has -(*R)-> */
 61         u8                              only_xr;
 62 
 63         /*
 64          * The parent field is used to implement breadth-first search, and the
 65          * bit 0 is reused to indicate if the lock has been accessed in BFS.
 66          */
 67         struct lock_list                *parent;
 68 };
 69 
 70 /**
 71  * struct lock_chain - lock dependency chain record
 72  *
 73  * @irq_context: the same as irq_context in held_lock below
 74  * @depth:       the number of held locks in this chain
 75  * @base:        the index in chain_hlocks for this chain
 76  * @entry:       the collided lock chains in lock_chain hash list
 77  * @chain_key:   the hash key of this lock_chain
 78  */
 79 struct lock_chain {
 80         /* see BUILD_BUG_ON()s in add_chain_cache() */
 81         unsigned int                    irq_context :  2,
 82                                         depth       :  6,
 83                                         base        : 24;
 84         /* 4 byte hole */
 85         struct hlist_node               entry;
 86         u64                             chain_key;
 87 };
 88 
 89 #define MAX_LOCKDEP_KEYS_BITS           13
 90 #define MAX_LOCKDEP_KEYS                (1UL << MAX_LOCKDEP_KEYS_BITS)
 91 #define INITIAL_CHAIN_KEY               -1
 92 
 93 struct held_lock {
 94         /*
 95          * One-way hash of the dependency chain up to this point. We
 96          * hash the hashes step by step as the dependency chain grows.
 97          *
 98          * We use it for dependency-caching and we skip detection
 99          * passes and dependency-updates if there is a cache-hit, so
100          * it is absolutely critical for 100% coverage of the validator
101          * to have a unique key value for every unique dependency path
102          * that can occur in the system, to make a unique hash value
103          * as likely as possible - hence the 64-bit width.
104          *
105          * The task struct holds the current hash value (initialized
106          * with zero), here we store the previous hash value:
107          */
108         u64                             prev_chain_key;
109         unsigned long                   acquire_ip;
110         struct lockdep_map              *instance;
111         struct lockdep_map              *nest_lock;
112 #ifdef CONFIG_LOCK_STAT
113         u64                             waittime_stamp;
114         u64                             holdtime_stamp;
115 #endif
116         /*
117          * class_idx is zero-indexed; it points to the element in
118          * lock_classes this held lock instance belongs to. class_idx is in
119          * the range from 0 to (MAX_LOCKDEP_KEYS-1) inclusive.
120          */
121         unsigned int                    class_idx:MAX_LOCKDEP_KEYS_BITS;
122         /*
123          * The lock-stack is unified in that the lock chains of interrupt
124          * contexts nest ontop of process context chains, but we 'separate'
125          * the hashes by starting with 0 if we cross into an interrupt
126          * context, and we also keep do not add cross-context lock
127          * dependencies - the lock usage graph walking covers that area
128          * anyway, and we'd just unnecessarily increase the number of
129          * dependencies otherwise. [Note: hardirq and softirq contexts
130          * are separated from each other too.]
131          *
132          * The following field is used to detect when we cross into an
133          * interrupt context:
134          */
135         unsigned int irq_context:2; /* bit 0 - soft, bit 1 - hard */
136         unsigned int trylock:1;                                         /* 16 bits */
137 
138         unsigned int read:2;        /* see lock_acquire() comment */
139         unsigned int check:1;       /* see lock_acquire() comment */
140         unsigned int hardirqs_off:1;
141         unsigned int references:12;                                     /* 32 bits */
142         unsigned int pin_count;
143 };
144 
145 /*
146  * Initialization, self-test and debugging-output methods:
147  */
148 extern void lockdep_init(void);
149 extern void lockdep_reset(void);
150 extern void lockdep_reset_lock(struct lockdep_map *lock);
151 extern void lockdep_free_key_range(void *start, unsigned long size);
152 extern asmlinkage void lockdep_sys_exit(void);
153 extern void lockdep_set_selftest_task(struct task_struct *task);
154 
155 extern void lockdep_init_task(struct task_struct *task);
156 
157 /*
158  * Split the recursion counter in two to readily detect 'off' vs recursion.
159  */
160 #define LOCKDEP_RECURSION_BITS  16
161 #define LOCKDEP_OFF             (1U << LOCKDEP_RECURSION_BITS)
162 #define LOCKDEP_RECURSION_MASK  (LOCKDEP_OFF - 1)
163 
164 /*
165  * lockdep_{off,on}() are macros to avoid tracing and kprobes; not inlines due
166  * to header dependencies.
167  */
168 
169 #define lockdep_off()                                   \
170 do {                                                    \
171         current->lockdep_recursion += LOCKDEP_OFF;      \
172 } while (0)
173 
174 #define lockdep_on()                                    \
175 do {                                                    \
176         current->lockdep_recursion -= LOCKDEP_OFF;      \
177 } while (0)
178 
179 extern void lockdep_register_key(struct lock_class_key *key);
180 extern void lockdep_unregister_key(struct lock_class_key *key);
181 
182 /*
183  * These methods are used by specific locking variants (spinlocks,
184  * rwlocks, mutexes and rwsems) to pass init/acquire/release events
185  * to lockdep:
186  */
187 
188 extern void lockdep_init_map_type(struct lockdep_map *lock, const char *name,
189         struct lock_class_key *key, int subclass, u8 inner, u8 outer, u8 lock_type);
190 
191 static inline void
192 lockdep_init_map_waits(struct lockdep_map *lock, const char *name,
193                        struct lock_class_key *key, int subclass, u8 inner, u8 outer)
194 {
195         lockdep_init_map_type(lock, name, key, subclass, inner, LD_WAIT_INV, LD_LOCK_NORMAL);
196 }
197 
198 static inline void
199 lockdep_init_map_wait(struct lockdep_map *lock, const char *name,
200                       struct lock_class_key *key, int subclass, u8 inner)
201 {
202         lockdep_init_map_waits(lock, name, key, subclass, inner, LD_WAIT_INV);
203 }
204 
205 static inline void lockdep_init_map(struct lockdep_map *lock, const char *name,
206                              struct lock_class_key *key, int subclass)
207 {
208         lockdep_init_map_wait(lock, name, key, subclass, LD_WAIT_INV);
209 }
210 
211 /*
212  * Reinitialize a lock key - for cases where there is special locking or
213  * special initialization of locks so that the validator gets the scope
214  * of dependencies wrong: they are either too broad (they need a class-split)
215  * or they are too narrow (they suffer from a false class-split):
216  */
217 #define lockdep_set_class(lock, key)                            \
218         lockdep_init_map_waits(&(lock)->dep_map, #key, key, 0,  \
219                                (lock)->dep_map.wait_type_inner, \
220                                (lock)->dep_map.wait_type_outer)
221 
222 #define lockdep_set_class_and_name(lock, key, name)             \
223         lockdep_init_map_waits(&(lock)->dep_map, name, key, 0,  \
224                                (lock)->dep_map.wait_type_inner, \
225                                (lock)->dep_map.wait_type_outer)
226 
227 #define lockdep_set_class_and_subclass(lock, key, sub)          \
228         lockdep_init_map_waits(&(lock)->dep_map, #key, key, sub,\
229                                (lock)->dep_map.wait_type_inner, \
230                                (lock)->dep_map.wait_type_outer)
231 
232 #define lockdep_set_subclass(lock, sub)                                 \
233         lockdep_init_map_waits(&(lock)->dep_map, #lock, (lock)->dep_map.key, sub,\
234                                (lock)->dep_map.wait_type_inner,         \
235                                (lock)->dep_map.wait_type_outer)
236 
237 #define lockdep_set_novalidate_class(lock) \
238         lockdep_set_class_and_name(lock, &__lockdep_no_validate__, #lock)
239 
240 /*
241  * Compare locking classes
242  */
243 #define lockdep_match_class(lock, key) lockdep_match_key(&(lock)->dep_map, key)
244 
245 static inline int lockdep_match_key(struct lockdep_map *lock,
246                                     struct lock_class_key *key)
247 {
248         return lock->key == key;
249 }
250 
251 /*
252  * Acquire a lock.
253  *
254  * Values for "read":
255  *
256  *   0: exclusive (write) acquire
257  *   1: read-acquire (no recursion allowed)
258  *   2: read-acquire with same-instance recursion allowed
259  *
260  * Values for check:
261  *
262  *   0: simple checks (freeing, held-at-exit-time, etc.)
263  *   1: full validation
264  */
265 extern void lock_acquire(struct lockdep_map *lock, unsigned int subclass,
266                          int trylock, int read, int check,
267                          struct lockdep_map *nest_lock, unsigned long ip);
268 
269 extern void lock_release(struct lockdep_map *lock, unsigned long ip);
270 
271 /* lock_is_held_type() returns */
272 #define LOCK_STATE_UNKNOWN      -1
273 #define LOCK_STATE_NOT_HELD     0
274 #define LOCK_STATE_HELD         1
275 
276 /*
277  * Same "read" as for lock_acquire(), except -1 means any.
278  */
279 extern int lock_is_held_type(const struct lockdep_map *lock, int read);
280 
281 static inline int lock_is_held(const struct lockdep_map *lock)
282 {
283         return lock_is_held_type(lock, -1);
284 }
285 
286 #define lockdep_is_held(lock)           lock_is_held(&(lock)->dep_map)
287 #define lockdep_is_held_type(lock, r)   lock_is_held_type(&(lock)->dep_map, (r))
288 
289 extern void lock_set_class(struct lockdep_map *lock, const char *name,
290                            struct lock_class_key *key, unsigned int subclass,
291                            unsigned long ip);
292 
293 static inline void lock_set_subclass(struct lockdep_map *lock,
294                 unsigned int subclass, unsigned long ip)
295 {
296         lock_set_class(lock, lock->name, lock->key, subclass, ip);
297 }
298 
299 extern void lock_downgrade(struct lockdep_map *lock, unsigned long ip);
300 
301 #define NIL_COOKIE (struct pin_cookie){ .val = 0U, }
302 
303 extern struct pin_cookie lock_pin_lock(struct lockdep_map *lock);
304 extern void lock_repin_lock(struct lockdep_map *lock, struct pin_cookie);
305 extern void lock_unpin_lock(struct lockdep_map *lock, struct pin_cookie);
306 
307 #define lockdep_depth(tsk)      (debug_locks ? (tsk)->lockdep_depth : 0)
308 
309 #define lockdep_assert_held(l)  do {                                    \
310                 WARN_ON(debug_locks &&                                  \
311                         lockdep_is_held(l) == LOCK_STATE_NOT_HELD);     \
312         } while (0)
313 
314 #define lockdep_assert_not_held(l)      do {                            \
315                 WARN_ON(debug_locks &&                                  \
316                         lockdep_is_held(l) == LOCK_STATE_HELD);         \
317         } while (0)
318 
319 #define lockdep_assert_held_write(l)    do {                    \
320                 WARN_ON(debug_locks && !lockdep_is_held_type(l, 0));    \
321         } while (0)
322 
323 #define lockdep_assert_held_read(l)     do {                            \
324                 WARN_ON(debug_locks && !lockdep_is_held_type(l, 1));    \
325         } while (0)
326 
327 #define lockdep_assert_held_once(l)     do {                            \
328                 WARN_ON_ONCE(debug_locks && !lockdep_is_held(l));       \
329         } while (0)
330 
331 #define lockdep_assert_none_held_once() do {                            \
332                 WARN_ON_ONCE(debug_locks && current->lockdep_depth);    \
333         } while (0)
334 
335 #define lockdep_recursing(tsk)  ((tsk)->lockdep_recursion)
336 
337 #define lockdep_pin_lock(l)     lock_pin_lock(&(l)->dep_map)
338 #define lockdep_repin_lock(l,c) lock_repin_lock(&(l)->dep_map, (c))
339 #define lockdep_unpin_lock(l,c) lock_unpin_lock(&(l)->dep_map, (c))
340 
341 #else /* !CONFIG_LOCKDEP */
342 
343 static inline void lockdep_init_task(struct task_struct *task)
344 {
345 }
346 
347 static inline void lockdep_off(void)
348 {
349 }
350 
351 static inline void lockdep_on(void)
352 {
353 }
354 
355 static inline void lockdep_set_selftest_task(struct task_struct *task)
356 {
357 }
358 
359 # define lock_acquire(l, s, t, r, c, n, i)      do { } while (0)
360 # define lock_release(l, i)                     do { } while (0)
361 # define lock_downgrade(l, i)                   do { } while (0)
362 # define lock_set_class(l, n, k, s, i)          do { } while (0)
363 # define lock_set_subclass(l, s, i)             do { } while (0)
364 # define lockdep_init()                         do { } while (0)
365 # define lockdep_init_map_type(lock, name, key, sub, inner, outer, type) \
366                 do { (void)(name); (void)(key); } while (0)
367 # define lockdep_init_map_waits(lock, name, key, sub, inner, outer) \
368                 do { (void)(name); (void)(key); } while (0)
369 # define lockdep_init_map_wait(lock, name, key, sub, inner) \
370                 do { (void)(name); (void)(key); } while (0)
371 # define lockdep_init_map(lock, name, key, sub) \
372                 do { (void)(name); (void)(key); } while (0)
373 # define lockdep_set_class(lock, key)           do { (void)(key); } while (0)
374 # define lockdep_set_class_and_name(lock, key, name) \
375                 do { (void)(key); (void)(name); } while (0)
376 #define lockdep_set_class_and_subclass(lock, key, sub) \
377                 do { (void)(key); } while (0)
378 #define lockdep_set_subclass(lock, sub)         do { } while (0)
379 
380 #define lockdep_set_novalidate_class(lock) do { } while (0)
381 
382 /*
383  * We don't define lockdep_match_class() and lockdep_match_key() for !LOCKDEP
384  * case since the result is not well defined and the caller should rather
385  * #ifdef the call himself.
386  */
387 
388 # define lockdep_reset()                do { debug_locks = 1; } while (0)
389 # define lockdep_free_key_range(start, size)    do { } while (0)
390 # define lockdep_sys_exit()                     do { } while (0)
391 
392 static inline void lockdep_register_key(struct lock_class_key *key)
393 {
394 }
395 
396 static inline void lockdep_unregister_key(struct lock_class_key *key)
397 {
398 }
399 
400 #define lockdep_depth(tsk)      (0)
401 
402 /*
403  * Dummy forward declarations, allow users to write less ifdef-y code
404  * and depend on dead code elimination.
405  */
406 extern int lock_is_held(const void *);
407 extern int lockdep_is_held(const void *);
408 #define lockdep_is_held_type(l, r)              (1)
409 
410 #define lockdep_assert_held(l)                  do { (void)(l); } while (0)
411 #define lockdep_assert_not_held(l)              do { (void)(l); } while (0)
412 #define lockdep_assert_held_write(l)            do { (void)(l); } while (0)
413 #define lockdep_assert_held_read(l)             do { (void)(l); } while (0)
414 #define lockdep_assert_held_once(l)             do { (void)(l); } while (0)
415 #define lockdep_assert_none_held_once() do { } while (0)
416 
417 #define lockdep_recursing(tsk)                  (0)
418 
419 #define NIL_COOKIE (struct pin_cookie){ }
420 
421 #define lockdep_pin_lock(l)                     ({ struct pin_cookie cookie = { }; cookie; })
422 #define lockdep_repin_lock(l, c)                do { (void)(l); (void)(c); } while (0)
423 #define lockdep_unpin_lock(l, c)                do { (void)(l); (void)(c); } while (0)
424 
425 #endif /* !LOCKDEP */
426 
427 enum xhlock_context_t {
428         XHLOCK_HARD,
429         XHLOCK_SOFT,
430         XHLOCK_CTX_NR,
431 };
432 
433 #define lockdep_init_map_crosslock(m, n, k, s) do {} while (0)
434 /*
435  * To initialize a lockdep_map statically use this macro.
436  * Note that _name must not be NULL.
437  */
438 #define STATIC_LOCKDEP_MAP_INIT(_name, _key) \
439         { .name = (_name), .key = (void *)(_key), }
440 
441 static inline void lockdep_invariant_state(bool force) {}
442 static inline void lockdep_free_task(struct task_struct *task) {}
443 
444 #ifdef CONFIG_LOCK_STAT
445 
446 extern void lock_contended(struct lockdep_map *lock, unsigned long ip);
447 extern void lock_acquired(struct lockdep_map *lock, unsigned long ip);
448 
449 #define LOCK_CONTENDED(_lock, try, lock)                        \
450 do {                                                            \
451         if (!try(_lock)) {                                      \
452                 lock_contended(&(_lock)->dep_map, _RET_IP_);    \
453                 lock(_lock);                                    \
454         }                                                       \
455         lock_acquired(&(_lock)->dep_map, _RET_IP_);                     \
456 } while (0)
457 
458 #define LOCK_CONTENDED_RETURN(_lock, try, lock)                 \
459 ({                                                              \
460         int ____err = 0;                                        \
461         if (!try(_lock)) {                                      \
462                 lock_contended(&(_lock)->dep_map, _RET_IP_);    \
463                 ____err = lock(_lock);                          \
464         }                                                       \
465         if (!____err)                                           \
466                 lock_acquired(&(_lock)->dep_map, _RET_IP_);     \
467         ____err;                                                \
468 })
469 
470 #else /* CONFIG_LOCK_STAT */
471 
472 #define lock_contended(lockdep_map, ip) do {} while (0)
473 #define lock_acquired(lockdep_map, ip) do {} while (0)
474 
475 #define LOCK_CONTENDED(_lock, try, lock) \
476         lock(_lock)
477 
478 #define LOCK_CONTENDED_RETURN(_lock, try, lock) \
479         lock(_lock)
480 
481 #endif /* CONFIG_LOCK_STAT */
482 
483 #ifdef CONFIG_LOCKDEP
484 
485 /*
486  * On lockdep we dont want the hand-coded irq-enable of
487  * _raw_*_lock_flags() code, because lockdep assumes
488  * that interrupts are not re-enabled during lock-acquire:
489  */
490 #define LOCK_CONTENDED_FLAGS(_lock, try, lock, lockfl, flags) \
491         LOCK_CONTENDED((_lock), (try), (lock))
492 
493 #else /* CONFIG_LOCKDEP */
494 
495 #define LOCK_CONTENDED_FLAGS(_lock, try, lock, lockfl, flags) \
496         lockfl((_lock), (flags))
497 
498 #endif /* CONFIG_LOCKDEP */
499 
500 #ifdef CONFIG_PROVE_LOCKING
501 extern void print_irqtrace_events(struct task_struct *curr);
502 #else
503 static inline void print_irqtrace_events(struct task_struct *curr)
504 {
505 }
506 #endif
507 
508 /* Variable used to make lockdep treat read_lock() as recursive in selftests */
509 #ifdef CONFIG_DEBUG_LOCKING_API_SELFTESTS
510 extern unsigned int force_read_lock_recursive;
511 #else /* CONFIG_DEBUG_LOCKING_API_SELFTESTS */
512 #define force_read_lock_recursive 0
513 #endif /* CONFIG_DEBUG_LOCKING_API_SELFTESTS */
514 
515 #ifdef CONFIG_LOCKDEP
516 extern bool read_lock_is_recursive(void);
517 #else /* CONFIG_LOCKDEP */
518 /* If !LOCKDEP, the value is meaningless */
519 #define read_lock_is_recursive() 0
520 #endif
521 
522 /*
523  * For trivial one-depth nesting of a lock-class, the following
524  * global define can be used. (Subsystems with multiple levels
525  * of nesting should define their own lock-nesting subclasses.)
526  */
527 #define SINGLE_DEPTH_NESTING                    1
528 
529 /*
530  * Map the dependency ops to NOP or to real lockdep ops, depending
531  * on the per lock-class debug mode:
532  */
533 
534 #define lock_acquire_exclusive(l, s, t, n, i)           lock_acquire(l, s, t, 0, 1, n, i)
535 #define lock_acquire_shared(l, s, t, n, i)              lock_acquire(l, s, t, 1, 1, n, i)
536 #define lock_acquire_shared_recursive(l, s, t, n, i)    lock_acquire(l, s, t, 2, 1, n, i)
537 
538 #define spin_acquire(l, s, t, i)                lock_acquire_exclusive(l, s, t, NULL, i)
539 #define spin_acquire_nest(l, s, t, n, i)        lock_acquire_exclusive(l, s, t, n, i)
540 #define spin_release(l, i)                      lock_release(l, i)
541 
542 #define rwlock_acquire(l, s, t, i)              lock_acquire_exclusive(l, s, t, NULL, i)
543 #define rwlock_acquire_read(l, s, t, i)                                 \
544 do {                                                                    \
545         if (read_lock_is_recursive())                                   \
546                 lock_acquire_shared_recursive(l, s, t, NULL, i);        \
547         else                                                            \
548                 lock_acquire_shared(l, s, t, NULL, i);                  \
549 } while (0)
550 
551 #define rwlock_release(l, i)                    lock_release(l, i)
552 
553 #define seqcount_acquire(l, s, t, i)            lock_acquire_exclusive(l, s, t, NULL, i)
554 #define seqcount_acquire_read(l, s, t, i)       lock_acquire_shared_recursive(l, s, t, NULL, i)
555 #define seqcount_release(l, i)                  lock_release(l, i)
556 
557 #define mutex_acquire(l, s, t, i)               lock_acquire_exclusive(l, s, t, NULL, i)
558 #define mutex_acquire_nest(l, s, t, n, i)       lock_acquire_exclusive(l, s, t, n, i)
559 #define mutex_release(l, i)                     lock_release(l, i)
560 
561 #define rwsem_acquire(l, s, t, i)               lock_acquire_exclusive(l, s, t, NULL, i)
562 #define rwsem_acquire_nest(l, s, t, n, i)       lock_acquire_exclusive(l, s, t, n, i)
563 #define rwsem_acquire_read(l, s, t, i)          lock_acquire_shared(l, s, t, NULL, i)
564 #define rwsem_release(l, i)                     lock_release(l, i)
565 
566 #define lock_map_acquire(l)                     lock_acquire_exclusive(l, 0, 0, NULL, _THIS_IP_)
567 #define lock_map_acquire_read(l)                lock_acquire_shared_recursive(l, 0, 0, NULL, _THIS_IP_)
568 #define lock_map_acquire_tryread(l)             lock_acquire_shared_recursive(l, 0, 1, NULL, _THIS_IP_)
569 #define lock_map_release(l)                     lock_release(l, _THIS_IP_)
570 
571 #ifdef CONFIG_PROVE_LOCKING
572 # define might_lock(lock)                                               \
573 do {                                                                    \
574         typecheck(struct lockdep_map *, &(lock)->dep_map);              \
575         lock_acquire(&(lock)->dep_map, 0, 0, 0, 1, NULL, _THIS_IP_);    \
576         lock_release(&(lock)->dep_map, _THIS_IP_);                      \
577 } while (0)
578 # define might_lock_read(lock)                                          \
579 do {                                                                    \
580         typecheck(struct lockdep_map *, &(lock)->dep_map);              \
581         lock_acquire(&(lock)->dep_map, 0, 0, 1, 1, NULL, _THIS_IP_);    \
582         lock_release(&(lock)->dep_map, _THIS_IP_);                      \
583 } while (0)
584 # define might_lock_nested(lock, subclass)                              \
585 do {                                                                    \
586         typecheck(struct lockdep_map *, &(lock)->dep_map);              \
587         lock_acquire(&(lock)->dep_map, subclass, 0, 1, 1, NULL,         \
588                      _THIS_IP_);                                        \
589         lock_release(&(lock)->dep_map, _THIS_IP_);                      \
590 } while (0)
591 
592 DECLARE_PER_CPU(int, hardirqs_enabled);
593 DECLARE_PER_CPU(int, hardirq_context);
594 DECLARE_PER_CPU(unsigned int, lockdep_recursion);
595 
596 #define __lockdep_enabled       (debug_locks && !this_cpu_read(lockdep_recursion))
597 
598 #define lockdep_assert_irqs_enabled()                                   \
599 do {                                                                    \
600         WARN_ON_ONCE(__lockdep_enabled && !this_cpu_read(hardirqs_enabled)); \
601 } while (0)
602 
603 #define lockdep_assert_irqs_disabled()                                  \
604 do {                                                                    \
605         WARN_ON_ONCE(__lockdep_enabled && this_cpu_read(hardirqs_enabled)); \
606 } while (0)
607 
608 #define lockdep_assert_in_irq()                                         \
609 do {                                                                    \
610         WARN_ON_ONCE(__lockdep_enabled && !this_cpu_read(hardirq_context)); \
611 } while (0)
612 
613 #define lockdep_assert_preemption_enabled()                             \
614 do {                                                                    \
615         WARN_ON_ONCE(IS_ENABLED(CONFIG_PREEMPT_COUNT)   &&              \
616                      __lockdep_enabled                  &&              \
617                      (preempt_count() != 0              ||              \
618                       !this_cpu_read(hardirqs_enabled)));               \
619 } while (0)
620 
621 #define lockdep_assert_preemption_disabled()                            \
622 do {                                                                    \
623         WARN_ON_ONCE(IS_ENABLED(CONFIG_PREEMPT_COUNT)   &&              \
624                      __lockdep_enabled                  &&              \
625                      (preempt_count() == 0              &&              \
626                       this_cpu_read(hardirqs_enabled)));                \
627 } while (0)
628 
629 /*
630  * Acceptable for protecting per-CPU resources accessed from BH.
631  * Much like in_softirq() - semantics are ambiguous, use carefully.
632  */
633 #define lockdep_assert_in_softirq()                                     \
634 do {                                                                    \
635         WARN_ON_ONCE(__lockdep_enabled                  &&              \
636                      (!in_softirq() || in_irq() || in_nmi()));          \
637 } while (0)
638 
639 #else
640 # define might_lock(lock) do { } while (0)
641 # define might_lock_read(lock) do { } while (0)
642 # define might_lock_nested(lock, subclass) do { } while (0)
643 
644 # define lockdep_assert_irqs_enabled() do { } while (0)
645 # define lockdep_assert_irqs_disabled() do { } while (0)
646 # define lockdep_assert_in_irq() do { } while (0)
647 
648 # define lockdep_assert_preemption_enabled() do { } while (0)
649 # define lockdep_assert_preemption_disabled() do { } while (0)
650 # define lockdep_assert_in_softirq() do { } while (0)
651 #endif
652 
653 #ifdef CONFIG_PROVE_RAW_LOCK_NESTING
654 
655 # define lockdep_assert_RT_in_threaded_ctx() do {                       \
656                 WARN_ONCE(debug_locks && !current->lockdep_recursion && \
657                           lockdep_hardirq_context() &&                  \
658                           !(current->hardirq_threaded || current->irq_config),  \
659                           "Not in threaded context on PREEMPT_RT as expected\n");       \
660 } while (0)
661 
662 #else
663 
664 # define lockdep_assert_RT_in_threaded_ctx() do { } while (0)
665 
666 #endif
667 
668 #ifdef CONFIG_LOCKDEP
669 void lockdep_rcu_suspicious(const char *file, const int line, const char *s);
670 #else
671 static inline void
672 lockdep_rcu_suspicious(const char *file, const int line, const char *s)
673 {
674 }
675 #endif
676 
677 #endif /* __LINUX_LOCKDEP_H */
678 

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