Merge tag 'livepatching-for-5.9' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux-2.6-microblaze.git] / include / linux / lockdep.h
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 <asm/percpu.h>
15
16 struct task_struct;
17
18 /* for sysctl */
19 extern int prove_locking;
20 extern int lock_stat;
21
22 #ifdef CONFIG_LOCKDEP
23
24 #include <linux/linkage.h>
25 #include <linux/list.h>
26 #include <linux/debug_locks.h>
27 #include <linux/stacktrace.h>
28
29 static inline void lockdep_copy_map(struct lockdep_map *to,
30                                     struct lockdep_map *from)
31 {
32         int i;
33
34         *to = *from;
35         /*
36          * Since the class cache can be modified concurrently we could observe
37          * half pointers (64bit arch using 32bit copy insns). Therefore clear
38          * the caches and take the performance hit.
39          *
40          * XXX it doesn't work well with lockdep_set_class_and_subclass(), since
41          *     that relies on cache abuse.
42          */
43         for (i = 0; i < NR_LOCKDEP_CACHING_CLASSES; i++)
44                 to->class_cache[i] = NULL;
45 }
46
47 /*
48  * Every lock has a list of other locks that were taken after it.
49  * We only grow the list, never remove from it:
50  */
51 struct lock_list {
52         struct list_head                entry;
53         struct lock_class               *class;
54         struct lock_class               *links_to;
55         const struct lock_trace         *trace;
56         int                             distance;
57
58         /*
59          * The parent field is used to implement breadth-first search, and the
60          * bit 0 is reused to indicate if the lock has been accessed in BFS.
61          */
62         struct lock_list                *parent;
63 };
64
65 /**
66  * struct lock_chain - lock dependency chain record
67  *
68  * @irq_context: the same as irq_context in held_lock below
69  * @depth:       the number of held locks in this chain
70  * @base:        the index in chain_hlocks for this chain
71  * @entry:       the collided lock chains in lock_chain hash list
72  * @chain_key:   the hash key of this lock_chain
73  */
74 struct lock_chain {
75         /* see BUILD_BUG_ON()s in add_chain_cache() */
76         unsigned int                    irq_context :  2,
77                                         depth       :  6,
78                                         base        : 24;
79         /* 4 byte hole */
80         struct hlist_node               entry;
81         u64                             chain_key;
82 };
83
84 #define MAX_LOCKDEP_KEYS_BITS           13
85 #define MAX_LOCKDEP_KEYS                (1UL << MAX_LOCKDEP_KEYS_BITS)
86 #define INITIAL_CHAIN_KEY               -1
87
88 struct held_lock {
89         /*
90          * One-way hash of the dependency chain up to this point. We
91          * hash the hashes step by step as the dependency chain grows.
92          *
93          * We use it for dependency-caching and we skip detection
94          * passes and dependency-updates if there is a cache-hit, so
95          * it is absolutely critical for 100% coverage of the validator
96          * to have a unique key value for every unique dependency path
97          * that can occur in the system, to make a unique hash value
98          * as likely as possible - hence the 64-bit width.
99          *
100          * The task struct holds the current hash value (initialized
101          * with zero), here we store the previous hash value:
102          */
103         u64                             prev_chain_key;
104         unsigned long                   acquire_ip;
105         struct lockdep_map              *instance;
106         struct lockdep_map              *nest_lock;
107 #ifdef CONFIG_LOCK_STAT
108         u64                             waittime_stamp;
109         u64                             holdtime_stamp;
110 #endif
111         /*
112          * class_idx is zero-indexed; it points to the element in
113          * lock_classes this held lock instance belongs to. class_idx is in
114          * the range from 0 to (MAX_LOCKDEP_KEYS-1) inclusive.
115          */
116         unsigned int                    class_idx:MAX_LOCKDEP_KEYS_BITS;
117         /*
118          * The lock-stack is unified in that the lock chains of interrupt
119          * contexts nest ontop of process context chains, but we 'separate'
120          * the hashes by starting with 0 if we cross into an interrupt
121          * context, and we also keep do not add cross-context lock
122          * dependencies - the lock usage graph walking covers that area
123          * anyway, and we'd just unnecessarily increase the number of
124          * dependencies otherwise. [Note: hardirq and softirq contexts
125          * are separated from each other too.]
126          *
127          * The following field is used to detect when we cross into an
128          * interrupt context:
129          */
130         unsigned int irq_context:2; /* bit 0 - soft, bit 1 - hard */
131         unsigned int trylock:1;                                         /* 16 bits */
132
133         unsigned int read:2;        /* see lock_acquire() comment */
134         unsigned int check:1;       /* see lock_acquire() comment */
135         unsigned int hardirqs_off:1;
136         unsigned int references:12;                                     /* 32 bits */
137         unsigned int pin_count;
138 };
139
140 /*
141  * Initialization, self-test and debugging-output methods:
142  */
143 extern void lockdep_init(void);
144 extern void lockdep_reset(void);
145 extern void lockdep_reset_lock(struct lockdep_map *lock);
146 extern void lockdep_free_key_range(void *start, unsigned long size);
147 extern asmlinkage void lockdep_sys_exit(void);
148 extern void lockdep_set_selftest_task(struct task_struct *task);
149
150 extern void lockdep_init_task(struct task_struct *task);
151
152 /*
153  * Split the recrursion counter in two to readily detect 'off' vs recursion.
154  */
155 #define LOCKDEP_RECURSION_BITS  16
156 #define LOCKDEP_OFF             (1U << LOCKDEP_RECURSION_BITS)
157 #define LOCKDEP_RECURSION_MASK  (LOCKDEP_OFF - 1)
158
159 /*
160  * lockdep_{off,on}() are macros to avoid tracing and kprobes; not inlines due
161  * to header dependencies.
162  */
163
164 #define lockdep_off()                                   \
165 do {                                                    \
166         current->lockdep_recursion += LOCKDEP_OFF;      \
167 } while (0)
168
169 #define lockdep_on()                                    \
170 do {                                                    \
171         current->lockdep_recursion -= LOCKDEP_OFF;      \
172 } while (0)
173
174 extern void lockdep_register_key(struct lock_class_key *key);
175 extern void lockdep_unregister_key(struct lock_class_key *key);
176
177 /*
178  * These methods are used by specific locking variants (spinlocks,
179  * rwlocks, mutexes and rwsems) to pass init/acquire/release events
180  * to lockdep:
181  */
182
183 extern void lockdep_init_map_waits(struct lockdep_map *lock, const char *name,
184         struct lock_class_key *key, int subclass, short inner, short outer);
185
186 static inline void
187 lockdep_init_map_wait(struct lockdep_map *lock, const char *name,
188                       struct lock_class_key *key, int subclass, short inner)
189 {
190         lockdep_init_map_waits(lock, name, key, subclass, inner, LD_WAIT_INV);
191 }
192
193 static inline void lockdep_init_map(struct lockdep_map *lock, const char *name,
194                              struct lock_class_key *key, int subclass)
195 {
196         lockdep_init_map_wait(lock, name, key, subclass, LD_WAIT_INV);
197 }
198
199 /*
200  * Reinitialize a lock key - for cases where there is special locking or
201  * special initialization of locks so that the validator gets the scope
202  * of dependencies wrong: they are either too broad (they need a class-split)
203  * or they are too narrow (they suffer from a false class-split):
204  */
205 #define lockdep_set_class(lock, key)                            \
206         lockdep_init_map_waits(&(lock)->dep_map, #key, key, 0,  \
207                                (lock)->dep_map.wait_type_inner, \
208                                (lock)->dep_map.wait_type_outer)
209
210 #define lockdep_set_class_and_name(lock, key, name)             \
211         lockdep_init_map_waits(&(lock)->dep_map, name, key, 0,  \
212                                (lock)->dep_map.wait_type_inner, \
213                                (lock)->dep_map.wait_type_outer)
214
215 #define lockdep_set_class_and_subclass(lock, key, sub)          \
216         lockdep_init_map_waits(&(lock)->dep_map, #key, key, sub,\
217                                (lock)->dep_map.wait_type_inner, \
218                                (lock)->dep_map.wait_type_outer)
219
220 #define lockdep_set_subclass(lock, sub)                                 \
221         lockdep_init_map_waits(&(lock)->dep_map, #lock, (lock)->dep_map.key, sub,\
222                                (lock)->dep_map.wait_type_inner,         \
223                                (lock)->dep_map.wait_type_outer)
224
225 #define lockdep_set_novalidate_class(lock) \
226         lockdep_set_class_and_name(lock, &__lockdep_no_validate__, #lock)
227
228 /*
229  * Compare locking classes
230  */
231 #define lockdep_match_class(lock, key) lockdep_match_key(&(lock)->dep_map, key)
232
233 static inline int lockdep_match_key(struct lockdep_map *lock,
234                                     struct lock_class_key *key)
235 {
236         return lock->key == key;
237 }
238
239 /*
240  * Acquire a lock.
241  *
242  * Values for "read":
243  *
244  *   0: exclusive (write) acquire
245  *   1: read-acquire (no recursion allowed)
246  *   2: read-acquire with same-instance recursion allowed
247  *
248  * Values for check:
249  *
250  *   0: simple checks (freeing, held-at-exit-time, etc.)
251  *   1: full validation
252  */
253 extern void lock_acquire(struct lockdep_map *lock, unsigned int subclass,
254                          int trylock, int read, int check,
255                          struct lockdep_map *nest_lock, unsigned long ip);
256
257 extern void lock_release(struct lockdep_map *lock, unsigned long ip);
258
259 /*
260  * Same "read" as for lock_acquire(), except -1 means any.
261  */
262 extern int lock_is_held_type(const struct lockdep_map *lock, int read);
263
264 static inline int lock_is_held(const struct lockdep_map *lock)
265 {
266         return lock_is_held_type(lock, -1);
267 }
268
269 #define lockdep_is_held(lock)           lock_is_held(&(lock)->dep_map)
270 #define lockdep_is_held_type(lock, r)   lock_is_held_type(&(lock)->dep_map, (r))
271
272 extern void lock_set_class(struct lockdep_map *lock, const char *name,
273                            struct lock_class_key *key, unsigned int subclass,
274                            unsigned long ip);
275
276 static inline void lock_set_subclass(struct lockdep_map *lock,
277                 unsigned int subclass, unsigned long ip)
278 {
279         lock_set_class(lock, lock->name, lock->key, subclass, ip);
280 }
281
282 extern void lock_downgrade(struct lockdep_map *lock, unsigned long ip);
283
284 #define NIL_COOKIE (struct pin_cookie){ .val = 0U, }
285
286 extern struct pin_cookie lock_pin_lock(struct lockdep_map *lock);
287 extern void lock_repin_lock(struct lockdep_map *lock, struct pin_cookie);
288 extern void lock_unpin_lock(struct lockdep_map *lock, struct pin_cookie);
289
290 #define lockdep_depth(tsk)      (debug_locks ? (tsk)->lockdep_depth : 0)
291
292 #define lockdep_assert_held(l)  do {                            \
293                 WARN_ON(debug_locks && !lockdep_is_held(l));    \
294         } while (0)
295
296 #define lockdep_assert_held_write(l)    do {                    \
297                 WARN_ON(debug_locks && !lockdep_is_held_type(l, 0));    \
298         } while (0)
299
300 #define lockdep_assert_held_read(l)     do {                            \
301                 WARN_ON(debug_locks && !lockdep_is_held_type(l, 1));    \
302         } while (0)
303
304 #define lockdep_assert_held_once(l)     do {                            \
305                 WARN_ON_ONCE(debug_locks && !lockdep_is_held(l));       \
306         } while (0)
307
308 #define lockdep_recursing(tsk)  ((tsk)->lockdep_recursion)
309
310 #define lockdep_pin_lock(l)     lock_pin_lock(&(l)->dep_map)
311 #define lockdep_repin_lock(l,c) lock_repin_lock(&(l)->dep_map, (c))
312 #define lockdep_unpin_lock(l,c) lock_unpin_lock(&(l)->dep_map, (c))
313
314 #else /* !CONFIG_LOCKDEP */
315
316 static inline void lockdep_init_task(struct task_struct *task)
317 {
318 }
319
320 static inline void lockdep_off(void)
321 {
322 }
323
324 static inline void lockdep_on(void)
325 {
326 }
327
328 static inline void lockdep_set_selftest_task(struct task_struct *task)
329 {
330 }
331
332 # define lock_acquire(l, s, t, r, c, n, i)      do { } while (0)
333 # define lock_release(l, i)                     do { } while (0)
334 # define lock_downgrade(l, i)                   do { } while (0)
335 # define lock_set_class(l, n, k, s, i)          do { } while (0)
336 # define lock_set_subclass(l, s, i)             do { } while (0)
337 # define lockdep_init()                         do { } while (0)
338 # define lockdep_init_map_waits(lock, name, key, sub, inner, outer) \
339                 do { (void)(name); (void)(key); } while (0)
340 # define lockdep_init_map_wait(lock, name, key, sub, inner) \
341                 do { (void)(name); (void)(key); } while (0)
342 # define lockdep_init_map(lock, name, key, sub) \
343                 do { (void)(name); (void)(key); } while (0)
344 # define lockdep_set_class(lock, key)           do { (void)(key); } while (0)
345 # define lockdep_set_class_and_name(lock, key, name) \
346                 do { (void)(key); (void)(name); } while (0)
347 #define lockdep_set_class_and_subclass(lock, key, sub) \
348                 do { (void)(key); } while (0)
349 #define lockdep_set_subclass(lock, sub)         do { } while (0)
350
351 #define lockdep_set_novalidate_class(lock) do { } while (0)
352
353 /*
354  * We don't define lockdep_match_class() and lockdep_match_key() for !LOCKDEP
355  * case since the result is not well defined and the caller should rather
356  * #ifdef the call himself.
357  */
358
359 # define lockdep_reset()                do { debug_locks = 1; } while (0)
360 # define lockdep_free_key_range(start, size)    do { } while (0)
361 # define lockdep_sys_exit()                     do { } while (0)
362
363 static inline void lockdep_register_key(struct lock_class_key *key)
364 {
365 }
366
367 static inline void lockdep_unregister_key(struct lock_class_key *key)
368 {
369 }
370
371 #define lockdep_depth(tsk)      (0)
372
373 #define lockdep_is_held_type(l, r)              (1)
374
375 #define lockdep_assert_held(l)                  do { (void)(l); } while (0)
376 #define lockdep_assert_held_write(l)    do { (void)(l); } while (0)
377 #define lockdep_assert_held_read(l)             do { (void)(l); } while (0)
378 #define lockdep_assert_held_once(l)             do { (void)(l); } while (0)
379
380 #define lockdep_recursing(tsk)                  (0)
381
382 #define NIL_COOKIE (struct pin_cookie){ }
383
384 #define lockdep_pin_lock(l)                     ({ struct pin_cookie cookie = { }; cookie; })
385 #define lockdep_repin_lock(l, c)                do { (void)(l); (void)(c); } while (0)
386 #define lockdep_unpin_lock(l, c)                do { (void)(l); (void)(c); } while (0)
387
388 #endif /* !LOCKDEP */
389
390 enum xhlock_context_t {
391         XHLOCK_HARD,
392         XHLOCK_SOFT,
393         XHLOCK_CTX_NR,
394 };
395
396 #define lockdep_init_map_crosslock(m, n, k, s) do {} while (0)
397 /*
398  * To initialize a lockdep_map statically use this macro.
399  * Note that _name must not be NULL.
400  */
401 #define STATIC_LOCKDEP_MAP_INIT(_name, _key) \
402         { .name = (_name), .key = (void *)(_key), }
403
404 static inline void lockdep_invariant_state(bool force) {}
405 static inline void lockdep_free_task(struct task_struct *task) {}
406
407 #ifdef CONFIG_LOCK_STAT
408
409 extern void lock_contended(struct lockdep_map *lock, unsigned long ip);
410 extern void lock_acquired(struct lockdep_map *lock, unsigned long ip);
411
412 #define LOCK_CONTENDED(_lock, try, lock)                        \
413 do {                                                            \
414         if (!try(_lock)) {                                      \
415                 lock_contended(&(_lock)->dep_map, _RET_IP_);    \
416                 lock(_lock);                                    \
417         }                                                       \
418         lock_acquired(&(_lock)->dep_map, _RET_IP_);                     \
419 } while (0)
420
421 #define LOCK_CONTENDED_RETURN(_lock, try, lock)                 \
422 ({                                                              \
423         int ____err = 0;                                        \
424         if (!try(_lock)) {                                      \
425                 lock_contended(&(_lock)->dep_map, _RET_IP_);    \
426                 ____err = lock(_lock);                          \
427         }                                                       \
428         if (!____err)                                           \
429                 lock_acquired(&(_lock)->dep_map, _RET_IP_);     \
430         ____err;                                                \
431 })
432
433 #else /* CONFIG_LOCK_STAT */
434
435 #define lock_contended(lockdep_map, ip) do {} while (0)
436 #define lock_acquired(lockdep_map, ip) do {} while (0)
437
438 #define LOCK_CONTENDED(_lock, try, lock) \
439         lock(_lock)
440
441 #define LOCK_CONTENDED_RETURN(_lock, try, lock) \
442         lock(_lock)
443
444 #endif /* CONFIG_LOCK_STAT */
445
446 #ifdef CONFIG_LOCKDEP
447
448 /*
449  * On lockdep we dont want the hand-coded irq-enable of
450  * _raw_*_lock_flags() code, because lockdep assumes
451  * that interrupts are not re-enabled during lock-acquire:
452  */
453 #define LOCK_CONTENDED_FLAGS(_lock, try, lock, lockfl, flags) \
454         LOCK_CONTENDED((_lock), (try), (lock))
455
456 #else /* CONFIG_LOCKDEP */
457
458 #define LOCK_CONTENDED_FLAGS(_lock, try, lock, lockfl, flags) \
459         lockfl((_lock), (flags))
460
461 #endif /* CONFIG_LOCKDEP */
462
463 #ifdef CONFIG_PROVE_LOCKING
464 extern void print_irqtrace_events(struct task_struct *curr);
465 #else
466 static inline void print_irqtrace_events(struct task_struct *curr)
467 {
468 }
469 #endif
470
471 /*
472  * For trivial one-depth nesting of a lock-class, the following
473  * global define can be used. (Subsystems with multiple levels
474  * of nesting should define their own lock-nesting subclasses.)
475  */
476 #define SINGLE_DEPTH_NESTING                    1
477
478 /*
479  * Map the dependency ops to NOP or to real lockdep ops, depending
480  * on the per lock-class debug mode:
481  */
482
483 #define lock_acquire_exclusive(l, s, t, n, i)           lock_acquire(l, s, t, 0, 1, n, i)
484 #define lock_acquire_shared(l, s, t, n, i)              lock_acquire(l, s, t, 1, 1, n, i)
485 #define lock_acquire_shared_recursive(l, s, t, n, i)    lock_acquire(l, s, t, 2, 1, n, i)
486
487 #define spin_acquire(l, s, t, i)                lock_acquire_exclusive(l, s, t, NULL, i)
488 #define spin_acquire_nest(l, s, t, n, i)        lock_acquire_exclusive(l, s, t, n, i)
489 #define spin_release(l, i)                      lock_release(l, i)
490
491 #define rwlock_acquire(l, s, t, i)              lock_acquire_exclusive(l, s, t, NULL, i)
492 #define rwlock_acquire_read(l, s, t, i)         lock_acquire_shared_recursive(l, s, t, NULL, i)
493 #define rwlock_release(l, i)                    lock_release(l, i)
494
495 #define seqcount_acquire(l, s, t, i)            lock_acquire_exclusive(l, s, t, NULL, i)
496 #define seqcount_acquire_read(l, s, t, i)       lock_acquire_shared_recursive(l, s, t, NULL, i)
497 #define seqcount_release(l, i)                  lock_release(l, i)
498
499 #define mutex_acquire(l, s, t, i)               lock_acquire_exclusive(l, s, t, NULL, i)
500 #define mutex_acquire_nest(l, s, t, n, i)       lock_acquire_exclusive(l, s, t, n, i)
501 #define mutex_release(l, i)                     lock_release(l, i)
502
503 #define rwsem_acquire(l, s, t, i)               lock_acquire_exclusive(l, s, t, NULL, i)
504 #define rwsem_acquire_nest(l, s, t, n, i)       lock_acquire_exclusive(l, s, t, n, i)
505 #define rwsem_acquire_read(l, s, t, i)          lock_acquire_shared(l, s, t, NULL, i)
506 #define rwsem_release(l, i)                     lock_release(l, i)
507
508 #define lock_map_acquire(l)                     lock_acquire_exclusive(l, 0, 0, NULL, _THIS_IP_)
509 #define lock_map_acquire_read(l)                lock_acquire_shared_recursive(l, 0, 0, NULL, _THIS_IP_)
510 #define lock_map_acquire_tryread(l)             lock_acquire_shared_recursive(l, 0, 1, NULL, _THIS_IP_)
511 #define lock_map_release(l)                     lock_release(l, _THIS_IP_)
512
513 #ifdef CONFIG_PROVE_LOCKING
514 # define might_lock(lock)                                               \
515 do {                                                                    \
516         typecheck(struct lockdep_map *, &(lock)->dep_map);              \
517         lock_acquire(&(lock)->dep_map, 0, 0, 0, 1, NULL, _THIS_IP_);    \
518         lock_release(&(lock)->dep_map, _THIS_IP_);                      \
519 } while (0)
520 # define might_lock_read(lock)                                          \
521 do {                                                                    \
522         typecheck(struct lockdep_map *, &(lock)->dep_map);              \
523         lock_acquire(&(lock)->dep_map, 0, 0, 1, 1, NULL, _THIS_IP_);    \
524         lock_release(&(lock)->dep_map, _THIS_IP_);                      \
525 } while (0)
526 # define might_lock_nested(lock, subclass)                              \
527 do {                                                                    \
528         typecheck(struct lockdep_map *, &(lock)->dep_map);              \
529         lock_acquire(&(lock)->dep_map, subclass, 0, 1, 1, NULL,         \
530                      _THIS_IP_);                                        \
531         lock_release(&(lock)->dep_map, _THIS_IP_);                      \
532 } while (0)
533
534 DECLARE_PER_CPU(int, hardirqs_enabled);
535 DECLARE_PER_CPU(int, hardirq_context);
536
537 #define lockdep_assert_irqs_enabled()                                   \
538 do {                                                                    \
539         WARN_ON_ONCE(debug_locks && !this_cpu_read(hardirqs_enabled));  \
540 } while (0)
541
542 #define lockdep_assert_irqs_disabled()                                  \
543 do {                                                                    \
544         WARN_ON_ONCE(debug_locks && this_cpu_read(hardirqs_enabled));   \
545 } while (0)
546
547 #define lockdep_assert_in_irq()                                         \
548 do {                                                                    \
549         WARN_ON_ONCE(debug_locks && !this_cpu_read(hardirq_context));   \
550 } while (0)
551
552 #define lockdep_assert_preemption_enabled()                             \
553 do {                                                                    \
554         WARN_ON_ONCE(IS_ENABLED(CONFIG_PREEMPT_COUNT)   &&              \
555                      debug_locks                        &&              \
556                      (preempt_count() != 0              ||              \
557                       !this_cpu_read(hardirqs_enabled)));               \
558 } while (0)
559
560 #define lockdep_assert_preemption_disabled()                            \
561 do {                                                                    \
562         WARN_ON_ONCE(IS_ENABLED(CONFIG_PREEMPT_COUNT)   &&              \
563                      debug_locks                        &&              \
564                      (preempt_count() == 0              &&              \
565                       this_cpu_read(hardirqs_enabled)));                \
566 } while (0)
567
568 #else
569 # define might_lock(lock) do { } while (0)
570 # define might_lock_read(lock) do { } while (0)
571 # define might_lock_nested(lock, subclass) do { } while (0)
572
573 # define lockdep_assert_irqs_enabled() do { } while (0)
574 # define lockdep_assert_irqs_disabled() do { } while (0)
575 # define lockdep_assert_in_irq() do { } while (0)
576
577 # define lockdep_assert_preemption_enabled() do { } while (0)
578 # define lockdep_assert_preemption_disabled() do { } while (0)
579 #endif
580
581 #ifdef CONFIG_PROVE_RAW_LOCK_NESTING
582
583 # define lockdep_assert_RT_in_threaded_ctx() do {                       \
584                 WARN_ONCE(debug_locks && !current->lockdep_recursion && \
585                           lockdep_hardirq_context() &&                  \
586                           !(current->hardirq_threaded || current->irq_config),  \
587                           "Not in threaded context on PREEMPT_RT as expected\n");       \
588 } while (0)
589
590 #else
591
592 # define lockdep_assert_RT_in_threaded_ctx() do { } while (0)
593
594 #endif
595
596 #ifdef CONFIG_LOCKDEP
597 void lockdep_rcu_suspicious(const char *file, const int line, const char *s);
598 #else
599 static inline void
600 lockdep_rcu_suspicious(const char *file, const int line, const char *s)
601 {
602 }
603 #endif
604
605 #endif /* __LINUX_LOCKDEP_H */