Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Runtime locking correctness validator |
| 3 | * |
Peter Zijlstra | 4b32d0a | 2007-07-19 01:48:59 -0700 | [diff] [blame] | 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> |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 6 | * |
| 7 | * see Documentation/lockdep-design.txt for more details. |
| 8 | */ |
| 9 | #ifndef __LINUX_LOCKDEP_H |
| 10 | #define __LINUX_LOCKDEP_H |
| 11 | |
Heiko Carstens | a1e96b0 | 2007-02-12 00:52:20 -0800 | [diff] [blame] | 12 | struct task_struct; |
Peter Zijlstra | f20786f | 2007-07-19 01:48:56 -0700 | [diff] [blame] | 13 | struct lockdep_map; |
Heiko Carstens | a1e96b0 | 2007-02-12 00:52:20 -0800 | [diff] [blame] | 14 | |
Dave Young | 2edf5e4 | 2010-03-10 15:24:10 -0800 | [diff] [blame] | 15 | /* for sysctl */ |
| 16 | extern int prove_locking; |
| 17 | extern int lock_stat; |
| 18 | |
Michael S. Tsirkin | db0b0ea | 2006-09-29 01:59:28 -0700 | [diff] [blame] | 19 | #ifdef CONFIG_LOCKDEP |
| 20 | |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 21 | #include <linux/linkage.h> |
| 22 | #include <linux/list.h> |
| 23 | #include <linux/debug_locks.h> |
| 24 | #include <linux/stacktrace.h> |
| 25 | |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 26 | /* |
Peter Zijlstra | 9851673 | 2009-01-22 14:18:40 +0100 | [diff] [blame] | 27 | * We'd rather not expose kernel/lockdep_states.h this wide, but we do need |
| 28 | * the total number of states... :-( |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 29 | */ |
Peter Zijlstra | 9851673 | 2009-01-22 14:18:40 +0100 | [diff] [blame] | 30 | #define XXX_LOCK_USAGE_STATES (1+3*4) |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 31 | |
| 32 | #define MAX_LOCKDEP_SUBCLASSES 8UL |
| 33 | |
| 34 | /* |
| 35 | * Lock-classes are keyed via unique addresses, by embedding the |
| 36 | * lockclass-key into the kernel (or module) .data section. (For |
| 37 | * static locks we use the lock address itself as the key.) |
| 38 | */ |
| 39 | struct lockdep_subclass_key { |
| 40 | char __one_byte; |
| 41 | } __attribute__ ((__packed__)); |
| 42 | |
| 43 | struct lock_class_key { |
| 44 | struct lockdep_subclass_key subkeys[MAX_LOCKDEP_SUBCLASSES]; |
| 45 | }; |
| 46 | |
Peter Zijlstra | 1704f47 | 2010-03-19 01:37:42 +0100 | [diff] [blame^] | 47 | extern struct lock_class_key __lockdep_no_validate__; |
| 48 | |
Peter Zijlstra | c7e78cf | 2008-10-16 23:17:09 +0200 | [diff] [blame] | 49 | #define LOCKSTAT_POINTS 4 |
| 50 | |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 51 | /* |
| 52 | * The lock-class itself: |
| 53 | */ |
| 54 | struct lock_class { |
| 55 | /* |
| 56 | * class-hash: |
| 57 | */ |
| 58 | struct list_head hash_entry; |
| 59 | |
| 60 | /* |
| 61 | * global list of all lock-classes: |
| 62 | */ |
| 63 | struct list_head lock_entry; |
| 64 | |
| 65 | struct lockdep_subclass_key *key; |
| 66 | unsigned int subclass; |
Ming Lei | e351b66 | 2009-07-22 22:48:09 +0800 | [diff] [blame] | 67 | unsigned int dep_gen_id; |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 68 | |
| 69 | /* |
| 70 | * IRQ/softirq usage tracking bits: |
| 71 | */ |
| 72 | unsigned long usage_mask; |
Peter Zijlstra | 9851673 | 2009-01-22 14:18:40 +0100 | [diff] [blame] | 73 | struct stack_trace usage_traces[XXX_LOCK_USAGE_STATES]; |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 74 | |
| 75 | /* |
| 76 | * These fields represent a directed graph of lock dependencies, |
| 77 | * to every node we attach a list of "forward" and a list of |
| 78 | * "backward" graph nodes. |
| 79 | */ |
| 80 | struct list_head locks_after, locks_before; |
| 81 | |
| 82 | /* |
| 83 | * Generation counter, when doing certain classes of graph walking, |
| 84 | * to ensure that we check one node only once: |
| 85 | */ |
| 86 | unsigned int version; |
| 87 | |
| 88 | /* |
| 89 | * Statistics counter: |
| 90 | */ |
| 91 | unsigned long ops; |
| 92 | |
| 93 | const char *name; |
| 94 | int name_version; |
Peter Zijlstra | f20786f | 2007-07-19 01:48:56 -0700 | [diff] [blame] | 95 | |
| 96 | #ifdef CONFIG_LOCK_STAT |
Peter Zijlstra | c7e78cf | 2008-10-16 23:17:09 +0200 | [diff] [blame] | 97 | unsigned long contention_point[LOCKSTAT_POINTS]; |
| 98 | unsigned long contending_point[LOCKSTAT_POINTS]; |
Peter Zijlstra | f20786f | 2007-07-19 01:48:56 -0700 | [diff] [blame] | 99 | #endif |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 100 | }; |
| 101 | |
Peter Zijlstra | f20786f | 2007-07-19 01:48:56 -0700 | [diff] [blame] | 102 | #ifdef CONFIG_LOCK_STAT |
| 103 | struct lock_time { |
| 104 | s64 min; |
| 105 | s64 max; |
| 106 | s64 total; |
| 107 | unsigned long nr; |
| 108 | }; |
| 109 | |
Peter Zijlstra | 9664567 | 2007-07-19 01:49:00 -0700 | [diff] [blame] | 110 | enum bounce_type { |
| 111 | bounce_acquired_write, |
| 112 | bounce_acquired_read, |
| 113 | bounce_contended_write, |
| 114 | bounce_contended_read, |
| 115 | nr_bounce_types, |
| 116 | |
| 117 | bounce_acquired = bounce_acquired_write, |
| 118 | bounce_contended = bounce_contended_write, |
| 119 | }; |
| 120 | |
Peter Zijlstra | f20786f | 2007-07-19 01:48:56 -0700 | [diff] [blame] | 121 | struct lock_class_stats { |
| 122 | unsigned long contention_point[4]; |
Peter Zijlstra | c7e78cf | 2008-10-16 23:17:09 +0200 | [diff] [blame] | 123 | unsigned long contending_point[4]; |
Peter Zijlstra | f20786f | 2007-07-19 01:48:56 -0700 | [diff] [blame] | 124 | struct lock_time read_waittime; |
| 125 | struct lock_time write_waittime; |
| 126 | struct lock_time read_holdtime; |
| 127 | struct lock_time write_holdtime; |
Peter Zijlstra | 9664567 | 2007-07-19 01:49:00 -0700 | [diff] [blame] | 128 | unsigned long bounces[nr_bounce_types]; |
Peter Zijlstra | f20786f | 2007-07-19 01:48:56 -0700 | [diff] [blame] | 129 | }; |
| 130 | |
| 131 | struct lock_class_stats lock_stats(struct lock_class *class); |
| 132 | void clear_lock_stats(struct lock_class *class); |
| 133 | #endif |
| 134 | |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 135 | /* |
| 136 | * Map the lock object (the lock instance) to the lock-class object. |
| 137 | * This is embedded into specific lock instances: |
| 138 | */ |
| 139 | struct lockdep_map { |
| 140 | struct lock_class_key *key; |
Ingo Molnar | d6d897c | 2006-07-10 04:44:04 -0700 | [diff] [blame] | 141 | struct lock_class *class_cache; |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 142 | const char *name; |
Peter Zijlstra | 9664567 | 2007-07-19 01:49:00 -0700 | [diff] [blame] | 143 | #ifdef CONFIG_LOCK_STAT |
| 144 | int cpu; |
Peter Zijlstra | c7e78cf | 2008-10-16 23:17:09 +0200 | [diff] [blame] | 145 | unsigned long ip; |
Peter Zijlstra | 9664567 | 2007-07-19 01:49:00 -0700 | [diff] [blame] | 146 | #endif |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 147 | }; |
| 148 | |
| 149 | /* |
| 150 | * Every lock has a list of other locks that were taken after it. |
| 151 | * We only grow the list, never remove from it: |
| 152 | */ |
| 153 | struct lock_list { |
| 154 | struct list_head entry; |
| 155 | struct lock_class *class; |
| 156 | struct stack_trace trace; |
Jason Baron | 068135e | 2007-02-10 01:44:59 -0800 | [diff] [blame] | 157 | int distance; |
Ming Lei | c94aa5c | 2009-07-16 15:44:29 +0200 | [diff] [blame] | 158 | |
Peter Zijlstra | af01296 | 2009-07-16 15:44:29 +0200 | [diff] [blame] | 159 | /* |
| 160 | * The parent field is used to implement breadth-first search, and the |
| 161 | * bit 0 is reused to indicate if the lock has been accessed in BFS. |
Ming Lei | c94aa5c | 2009-07-16 15:44:29 +0200 | [diff] [blame] | 162 | */ |
| 163 | struct lock_list *parent; |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 164 | }; |
| 165 | |
| 166 | /* |
| 167 | * We record lock dependency chains, so that we can cache them: |
| 168 | */ |
| 169 | struct lock_chain { |
Huang, Ying | 443cd50 | 2008-06-20 16:39:21 +0800 | [diff] [blame] | 170 | u8 irq_context; |
| 171 | u8 depth; |
| 172 | u16 base; |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 173 | struct list_head entry; |
| 174 | u64 chain_key; |
| 175 | }; |
| 176 | |
Ingo Molnar | e5f363e3 | 2008-08-11 12:37:27 +0200 | [diff] [blame] | 177 | #define MAX_LOCKDEP_KEYS_BITS 13 |
Peter Zijlstra | b42e737 | 2008-08-11 12:34:42 +0200 | [diff] [blame] | 178 | /* |
| 179 | * Subtract one because we offset hlock->class_idx by 1 in order |
| 180 | * to make 0 mean no class. This avoids overflowing the class_idx |
| 181 | * bitfield and hitting the BUG in hlock_class(). |
| 182 | */ |
| 183 | #define MAX_LOCKDEP_KEYS ((1UL << MAX_LOCKDEP_KEYS_BITS) - 1) |
Dave Jones | f82b217 | 2008-08-11 09:30:23 +0200 | [diff] [blame] | 184 | |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 185 | struct held_lock { |
| 186 | /* |
| 187 | * One-way hash of the dependency chain up to this point. We |
| 188 | * hash the hashes step by step as the dependency chain grows. |
| 189 | * |
| 190 | * We use it for dependency-caching and we skip detection |
| 191 | * passes and dependency-updates if there is a cache-hit, so |
| 192 | * it is absolutely critical for 100% coverage of the validator |
| 193 | * to have a unique key value for every unique dependency path |
| 194 | * that can occur in the system, to make a unique hash value |
| 195 | * as likely as possible - hence the 64-bit width. |
| 196 | * |
| 197 | * The task struct holds the current hash value (initialized |
| 198 | * with zero), here we store the previous hash value: |
| 199 | */ |
| 200 | u64 prev_chain_key; |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 201 | unsigned long acquire_ip; |
| 202 | struct lockdep_map *instance; |
Peter Zijlstra | 7531e2f | 2008-08-11 09:30:24 +0200 | [diff] [blame] | 203 | struct lockdep_map *nest_lock; |
Peter Zijlstra | f20786f | 2007-07-19 01:48:56 -0700 | [diff] [blame] | 204 | #ifdef CONFIG_LOCK_STAT |
| 205 | u64 waittime_stamp; |
| 206 | u64 holdtime_stamp; |
| 207 | #endif |
Dave Jones | f82b217 | 2008-08-11 09:30:23 +0200 | [diff] [blame] | 208 | unsigned int class_idx:MAX_LOCKDEP_KEYS_BITS; |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 209 | /* |
| 210 | * The lock-stack is unified in that the lock chains of interrupt |
| 211 | * contexts nest ontop of process context chains, but we 'separate' |
| 212 | * the hashes by starting with 0 if we cross into an interrupt |
| 213 | * context, and we also keep do not add cross-context lock |
| 214 | * dependencies - the lock usage graph walking covers that area |
| 215 | * anyway, and we'd just unnecessarily increase the number of |
| 216 | * dependencies otherwise. [Note: hardirq and softirq contexts |
| 217 | * are separated from each other too.] |
| 218 | * |
| 219 | * The following field is used to detect when we cross into an |
| 220 | * interrupt context: |
| 221 | */ |
Dave Jones | f82b217 | 2008-08-11 09:30:23 +0200 | [diff] [blame] | 222 | unsigned int irq_context:2; /* bit 0 - soft, bit 1 - hard */ |
Peter Zijlstra | bb97a91 | 2009-07-20 19:15:35 +0200 | [diff] [blame] | 223 | unsigned int trylock:1; /* 16 bits */ |
| 224 | |
Dave Jones | f82b217 | 2008-08-11 09:30:23 +0200 | [diff] [blame] | 225 | unsigned int read:2; /* see lock_acquire() comment */ |
| 226 | unsigned int check:2; /* see lock_acquire() comment */ |
| 227 | unsigned int hardirqs_off:1; |
Peter Zijlstra | bb97a91 | 2009-07-20 19:15:35 +0200 | [diff] [blame] | 228 | unsigned int references:11; /* 32 bits */ |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 229 | }; |
| 230 | |
| 231 | /* |
| 232 | * Initialization, self-test and debugging-output methods: |
| 233 | */ |
| 234 | extern void lockdep_init(void); |
| 235 | extern void lockdep_info(void); |
| 236 | extern void lockdep_reset(void); |
| 237 | extern void lockdep_reset_lock(struct lockdep_map *lock); |
| 238 | extern void lockdep_free_key_range(void *start, unsigned long size); |
Peter Zijlstra | b351d16 | 2007-10-11 22:11:12 +0200 | [diff] [blame] | 239 | extern void lockdep_sys_exit(void); |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 240 | |
| 241 | extern void lockdep_off(void); |
| 242 | extern void lockdep_on(void); |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 243 | |
| 244 | /* |
| 245 | * These methods are used by specific locking variants (spinlocks, |
| 246 | * rwlocks, mutexes and rwsems) to pass init/acquire/release events |
| 247 | * to lockdep: |
| 248 | */ |
| 249 | |
| 250 | extern void lockdep_init_map(struct lockdep_map *lock, const char *name, |
Peter Zijlstra | 4dfbb9d | 2006-10-11 01:45:14 -0400 | [diff] [blame] | 251 | struct lock_class_key *key, int subclass); |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 252 | |
| 253 | /* |
Peter Zijlstra | 851a67b | 2007-10-11 22:11:12 +0200 | [diff] [blame] | 254 | * To initialize a lockdep_map statically use this macro. |
| 255 | * Note that _name must not be NULL. |
| 256 | */ |
| 257 | #define STATIC_LOCKDEP_MAP_INIT(_name, _key) \ |
| 258 | { .name = (_name), .key = (void *)(_key), } |
| 259 | |
| 260 | /* |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 261 | * Reinitialize a lock key - for cases where there is special locking or |
| 262 | * special initialization of locks so that the validator gets the scope |
| 263 | * of dependencies wrong: they are either too broad (they need a class-split) |
| 264 | * or they are too narrow (they suffer from a false class-split): |
| 265 | */ |
| 266 | #define lockdep_set_class(lock, key) \ |
Peter Zijlstra | 4dfbb9d | 2006-10-11 01:45:14 -0400 | [diff] [blame] | 267 | lockdep_init_map(&(lock)->dep_map, #key, key, 0) |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 268 | #define lockdep_set_class_and_name(lock, key, name) \ |
Peter Zijlstra | 4dfbb9d | 2006-10-11 01:45:14 -0400 | [diff] [blame] | 269 | lockdep_init_map(&(lock)->dep_map, name, key, 0) |
| 270 | #define lockdep_set_class_and_subclass(lock, key, sub) \ |
| 271 | lockdep_init_map(&(lock)->dep_map, #key, key, sub) |
| 272 | #define lockdep_set_subclass(lock, sub) \ |
| 273 | lockdep_init_map(&(lock)->dep_map, #lock, \ |
| 274 | (lock)->dep_map.key, sub) |
Peter Zijlstra | 1704f47 | 2010-03-19 01:37:42 +0100 | [diff] [blame^] | 275 | |
| 276 | #define lockdep_set_novalidate_class(lock) \ |
| 277 | lockdep_set_class(lock, &__lockdep_no_validate__) |
Jan Kara | 9a7aa12 | 2009-06-04 15:26:49 +0200 | [diff] [blame] | 278 | /* |
| 279 | * Compare locking classes |
| 280 | */ |
| 281 | #define lockdep_match_class(lock, key) lockdep_match_key(&(lock)->dep_map, key) |
| 282 | |
| 283 | static inline int lockdep_match_key(struct lockdep_map *lock, |
| 284 | struct lock_class_key *key) |
| 285 | { |
| 286 | return lock->key == key; |
| 287 | } |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 288 | |
| 289 | /* |
| 290 | * Acquire a lock. |
| 291 | * |
| 292 | * Values for "read": |
| 293 | * |
| 294 | * 0: exclusive (write) acquire |
| 295 | * 1: read-acquire (no recursion allowed) |
| 296 | * 2: read-acquire with same-instance recursion allowed |
| 297 | * |
| 298 | * Values for check: |
| 299 | * |
| 300 | * 0: disabled |
| 301 | * 1: simple checks (freeing, held-at-exit-time, etc.) |
| 302 | * 2: full validation |
| 303 | */ |
| 304 | extern void lock_acquire(struct lockdep_map *lock, unsigned int subclass, |
Peter Zijlstra | 7531e2f | 2008-08-11 09:30:24 +0200 | [diff] [blame] | 305 | int trylock, int read, int check, |
| 306 | struct lockdep_map *nest_lock, unsigned long ip); |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 307 | |
| 308 | extern void lock_release(struct lockdep_map *lock, int nested, |
| 309 | unsigned long ip); |
| 310 | |
Peter Zijlstra | f607c66 | 2009-07-20 19:16:29 +0200 | [diff] [blame] | 311 | #define lockdep_is_held(lock) lock_is_held(&(lock)->dep_map) |
| 312 | |
| 313 | extern int lock_is_held(struct lockdep_map *lock); |
| 314 | |
Peter Zijlstra | 00ef9f7 | 2008-12-04 09:00:17 +0100 | [diff] [blame] | 315 | extern void lock_set_class(struct lockdep_map *lock, const char *name, |
| 316 | struct lock_class_key *key, unsigned int subclass, |
| 317 | unsigned long ip); |
| 318 | |
| 319 | static inline void lock_set_subclass(struct lockdep_map *lock, |
| 320 | unsigned int subclass, unsigned long ip) |
| 321 | { |
| 322 | lock_set_class(lock, lock->name, lock->key, subclass, ip); |
| 323 | } |
Peter Zijlstra | 64aa348 | 2008-08-11 09:30:21 +0200 | [diff] [blame] | 324 | |
Nick Piggin | cf40bd1 | 2009-01-21 08:12:39 +0100 | [diff] [blame] | 325 | extern void lockdep_set_current_reclaim_state(gfp_t gfp_mask); |
| 326 | extern void lockdep_clear_current_reclaim_state(void); |
| 327 | extern void lockdep_trace_alloc(gfp_t mask); |
| 328 | |
| 329 | # define INIT_LOCKDEP .lockdep_recursion = 0, .lockdep_reclaim_gfp = 0, |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 330 | |
Jarek Poplawski | e3a55fd | 2007-03-22 00:11:26 -0800 | [diff] [blame] | 331 | #define lockdep_depth(tsk) (debug_locks ? (tsk)->lockdep_depth : 0) |
Peter Zijlstra | d5abe66 | 2006-12-06 20:37:26 -0800 | [diff] [blame] | 332 | |
Peter Zijlstra | f607c66 | 2009-07-20 19:16:29 +0200 | [diff] [blame] | 333 | #define lockdep_assert_held(l) WARN_ON(debug_locks && !lockdep_is_held(l)) |
| 334 | |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 335 | #else /* !LOCKDEP */ |
| 336 | |
| 337 | static inline void lockdep_off(void) |
| 338 | { |
| 339 | } |
| 340 | |
| 341 | static inline void lockdep_on(void) |
| 342 | { |
| 343 | } |
| 344 | |
Peter Zijlstra | 7531e2f | 2008-08-11 09:30:24 +0200 | [diff] [blame] | 345 | # define lock_acquire(l, s, t, r, c, n, i) do { } while (0) |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 346 | # define lock_release(l, n, i) do { } while (0) |
Peter Zijlstra | 00ef9f7 | 2008-12-04 09:00:17 +0100 | [diff] [blame] | 347 | # define lock_set_class(l, n, k, s, i) do { } while (0) |
Peter Zijlstra | 64aa348 | 2008-08-11 09:30:21 +0200 | [diff] [blame] | 348 | # define lock_set_subclass(l, s, i) do { } while (0) |
Nick Piggin | cf40bd1 | 2009-01-21 08:12:39 +0100 | [diff] [blame] | 349 | # define lockdep_set_current_reclaim_state(g) do { } while (0) |
| 350 | # define lockdep_clear_current_reclaim_state() do { } while (0) |
| 351 | # define lockdep_trace_alloc(g) do { } while (0) |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 352 | # define lockdep_init() do { } while (0) |
| 353 | # define lockdep_info() do { } while (0) |
Ingo Molnar | e25cf3d | 2008-10-17 15:55:07 +0200 | [diff] [blame] | 354 | # define lockdep_init_map(lock, name, key, sub) \ |
| 355 | do { (void)(name); (void)(key); } while (0) |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 356 | # define lockdep_set_class(lock, key) do { (void)(key); } while (0) |
| 357 | # define lockdep_set_class_and_name(lock, key, name) \ |
Ingo Molnar | e25cf3d | 2008-10-17 15:55:07 +0200 | [diff] [blame] | 358 | do { (void)(key); (void)(name); } while (0) |
Peter Zijlstra | 4dfbb9d | 2006-10-11 01:45:14 -0400 | [diff] [blame] | 359 | #define lockdep_set_class_and_subclass(lock, key, sub) \ |
| 360 | do { (void)(key); } while (0) |
Andrew Morton | 07646e2 | 2006-10-11 23:45:23 -0400 | [diff] [blame] | 361 | #define lockdep_set_subclass(lock, sub) do { } while (0) |
Peter Zijlstra | 1704f47 | 2010-03-19 01:37:42 +0100 | [diff] [blame^] | 362 | |
| 363 | #define lockdep_set_novalidate_class(lock) do { } while (0) |
| 364 | |
Jan Kara | 9a7aa12 | 2009-06-04 15:26:49 +0200 | [diff] [blame] | 365 | /* |
| 366 | * We don't define lockdep_match_class() and lockdep_match_key() for !LOCKDEP |
| 367 | * case since the result is not well defined and the caller should rather |
| 368 | * #ifdef the call himself. |
| 369 | */ |
Andrew Morton | 07646e2 | 2006-10-11 23:45:23 -0400 | [diff] [blame] | 370 | |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 371 | # define INIT_LOCKDEP |
| 372 | # define lockdep_reset() do { debug_locks = 1; } while (0) |
| 373 | # define lockdep_free_key_range(start, size) do { } while (0) |
Peter Zijlstra | b351d16 | 2007-10-11 22:11:12 +0200 | [diff] [blame] | 374 | # define lockdep_sys_exit() do { } while (0) |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 375 | /* |
| 376 | * The class key takes no space if lockdep is disabled: |
| 377 | */ |
| 378 | struct lock_class_key { }; |
Peter Zijlstra | d5abe66 | 2006-12-06 20:37:26 -0800 | [diff] [blame] | 379 | |
| 380 | #define lockdep_depth(tsk) (0) |
| 381 | |
Peter Zijlstra | f607c66 | 2009-07-20 19:16:29 +0200 | [diff] [blame] | 382 | #define lockdep_assert_held(l) do { } while (0) |
| 383 | |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 384 | #endif /* !LOCKDEP */ |
| 385 | |
Peter Zijlstra | f20786f | 2007-07-19 01:48:56 -0700 | [diff] [blame] | 386 | #ifdef CONFIG_LOCK_STAT |
| 387 | |
| 388 | extern void lock_contended(struct lockdep_map *lock, unsigned long ip); |
Peter Zijlstra | c7e78cf | 2008-10-16 23:17:09 +0200 | [diff] [blame] | 389 | extern void lock_acquired(struct lockdep_map *lock, unsigned long ip); |
Peter Zijlstra | f20786f | 2007-07-19 01:48:56 -0700 | [diff] [blame] | 390 | |
| 391 | #define LOCK_CONTENDED(_lock, try, lock) \ |
| 392 | do { \ |
| 393 | if (!try(_lock)) { \ |
| 394 | lock_contended(&(_lock)->dep_map, _RET_IP_); \ |
| 395 | lock(_lock); \ |
Peter Zijlstra | f20786f | 2007-07-19 01:48:56 -0700 | [diff] [blame] | 396 | } \ |
Peter Zijlstra | c7e78cf | 2008-10-16 23:17:09 +0200 | [diff] [blame] | 397 | lock_acquired(&(_lock)->dep_map, _RET_IP_); \ |
Peter Zijlstra | f20786f | 2007-07-19 01:48:56 -0700 | [diff] [blame] | 398 | } while (0) |
| 399 | |
| 400 | #else /* CONFIG_LOCK_STAT */ |
| 401 | |
| 402 | #define lock_contended(lockdep_map, ip) do {} while (0) |
Peter Zijlstra | c7e78cf | 2008-10-16 23:17:09 +0200 | [diff] [blame] | 403 | #define lock_acquired(lockdep_map, ip) do {} while (0) |
Peter Zijlstra | f20786f | 2007-07-19 01:48:56 -0700 | [diff] [blame] | 404 | |
| 405 | #define LOCK_CONTENDED(_lock, try, lock) \ |
| 406 | lock(_lock) |
| 407 | |
| 408 | #endif /* CONFIG_LOCK_STAT */ |
| 409 | |
Robin Holt | e8c158b | 2009-04-02 16:59:45 -0700 | [diff] [blame] | 410 | #ifdef CONFIG_LOCKDEP |
| 411 | |
| 412 | /* |
| 413 | * On lockdep we dont want the hand-coded irq-enable of |
| 414 | * _raw_*_lock_flags() code, because lockdep assumes |
| 415 | * that interrupts are not re-enabled during lock-acquire: |
| 416 | */ |
| 417 | #define LOCK_CONTENDED_FLAGS(_lock, try, lock, lockfl, flags) \ |
| 418 | LOCK_CONTENDED((_lock), (try), (lock)) |
| 419 | |
| 420 | #else /* CONFIG_LOCKDEP */ |
| 421 | |
| 422 | #define LOCK_CONTENDED_FLAGS(_lock, try, lock, lockfl, flags) \ |
| 423 | lockfl((_lock), (flags)) |
| 424 | |
| 425 | #endif /* CONFIG_LOCKDEP */ |
| 426 | |
KOSAKI Motohiro | 74c8a61 | 2008-12-17 19:40:33 +0900 | [diff] [blame] | 427 | #ifdef CONFIG_GENERIC_HARDIRQS |
Ingo Molnar | 243c762 | 2006-07-03 00:25:06 -0700 | [diff] [blame] | 428 | extern void early_init_irq_lock_class(void); |
| 429 | #else |
Ingo Molnar | 3117df0 | 2006-12-13 00:34:43 -0800 | [diff] [blame] | 430 | static inline void early_init_irq_lock_class(void) |
| 431 | { |
| 432 | } |
Ingo Molnar | 243c762 | 2006-07-03 00:25:06 -0700 | [diff] [blame] | 433 | #endif |
| 434 | |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 435 | #ifdef CONFIG_TRACE_IRQFLAGS |
| 436 | extern void early_boot_irqs_off(void); |
| 437 | extern void early_boot_irqs_on(void); |
Ingo Molnar | 3117df0 | 2006-12-13 00:34:43 -0800 | [diff] [blame] | 438 | extern void print_irqtrace_events(struct task_struct *curr); |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 439 | #else |
Ingo Molnar | 3117df0 | 2006-12-13 00:34:43 -0800 | [diff] [blame] | 440 | static inline void early_boot_irqs_off(void) |
| 441 | { |
| 442 | } |
| 443 | static inline void early_boot_irqs_on(void) |
| 444 | { |
| 445 | } |
| 446 | static inline void print_irqtrace_events(struct task_struct *curr) |
| 447 | { |
| 448 | } |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 449 | #endif |
| 450 | |
| 451 | /* |
| 452 | * For trivial one-depth nesting of a lock-class, the following |
| 453 | * global define can be used. (Subsystems with multiple levels |
| 454 | * of nesting should define their own lock-nesting subclasses.) |
| 455 | */ |
| 456 | #define SINGLE_DEPTH_NESTING 1 |
| 457 | |
| 458 | /* |
| 459 | * Map the dependency ops to NOP or to real lockdep ops, depending |
| 460 | * on the per lock-class debug mode: |
| 461 | */ |
| 462 | |
| 463 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
| 464 | # ifdef CONFIG_PROVE_LOCKING |
Peter Zijlstra | 7531e2f | 2008-08-11 09:30:24 +0200 | [diff] [blame] | 465 | # define spin_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 2, NULL, i) |
Peter Zijlstra | b7d39af | 2008-08-11 09:30:24 +0200 | [diff] [blame] | 466 | # define spin_acquire_nest(l, s, t, n, i) lock_acquire(l, s, t, 0, 2, n, i) |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 467 | # else |
Peter Zijlstra | 7531e2f | 2008-08-11 09:30:24 +0200 | [diff] [blame] | 468 | # define spin_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 1, NULL, i) |
Peter Zijlstra | b7d39af | 2008-08-11 09:30:24 +0200 | [diff] [blame] | 469 | # define spin_acquire_nest(l, s, t, n, i) lock_acquire(l, s, t, 0, 1, NULL, i) |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 470 | # endif |
| 471 | # define spin_release(l, n, i) lock_release(l, n, i) |
| 472 | #else |
| 473 | # define spin_acquire(l, s, t, i) do { } while (0) |
| 474 | # define spin_release(l, n, i) do { } while (0) |
| 475 | #endif |
| 476 | |
| 477 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
| 478 | # ifdef CONFIG_PROVE_LOCKING |
Peter Zijlstra | 7531e2f | 2008-08-11 09:30:24 +0200 | [diff] [blame] | 479 | # define rwlock_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 2, NULL, i) |
| 480 | # define rwlock_acquire_read(l, s, t, i) lock_acquire(l, s, t, 2, 2, NULL, i) |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 481 | # else |
Peter Zijlstra | 7531e2f | 2008-08-11 09:30:24 +0200 | [diff] [blame] | 482 | # define rwlock_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 1, NULL, i) |
| 483 | # define rwlock_acquire_read(l, s, t, i) lock_acquire(l, s, t, 2, 1, NULL, i) |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 484 | # endif |
| 485 | # define rwlock_release(l, n, i) lock_release(l, n, i) |
| 486 | #else |
| 487 | # define rwlock_acquire(l, s, t, i) do { } while (0) |
| 488 | # define rwlock_acquire_read(l, s, t, i) do { } while (0) |
| 489 | # define rwlock_release(l, n, i) do { } while (0) |
| 490 | #endif |
| 491 | |
| 492 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
| 493 | # ifdef CONFIG_PROVE_LOCKING |
Peter Zijlstra | 7531e2f | 2008-08-11 09:30:24 +0200 | [diff] [blame] | 494 | # define mutex_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 2, NULL, i) |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 495 | # else |
Peter Zijlstra | 7531e2f | 2008-08-11 09:30:24 +0200 | [diff] [blame] | 496 | # define mutex_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 1, NULL, i) |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 497 | # endif |
| 498 | # define mutex_release(l, n, i) lock_release(l, n, i) |
| 499 | #else |
| 500 | # define mutex_acquire(l, s, t, i) do { } while (0) |
| 501 | # define mutex_release(l, n, i) do { } while (0) |
| 502 | #endif |
| 503 | |
| 504 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
| 505 | # ifdef CONFIG_PROVE_LOCKING |
Peter Zijlstra | 7531e2f | 2008-08-11 09:30:24 +0200 | [diff] [blame] | 506 | # define rwsem_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 2, NULL, i) |
| 507 | # define rwsem_acquire_read(l, s, t, i) lock_acquire(l, s, t, 1, 2, NULL, i) |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 508 | # else |
Peter Zijlstra | 7531e2f | 2008-08-11 09:30:24 +0200 | [diff] [blame] | 509 | # define rwsem_acquire(l, s, t, i) lock_acquire(l, s, t, 0, 1, NULL, i) |
| 510 | # define rwsem_acquire_read(l, s, t, i) lock_acquire(l, s, t, 1, 1, NULL, i) |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 511 | # endif |
| 512 | # define rwsem_release(l, n, i) lock_release(l, n, i) |
| 513 | #else |
| 514 | # define rwsem_acquire(l, s, t, i) do { } while (0) |
| 515 | # define rwsem_acquire_read(l, s, t, i) do { } while (0) |
| 516 | # define rwsem_release(l, n, i) do { } while (0) |
| 517 | #endif |
| 518 | |
Peter Zijlstra | 4f3e752 | 2008-08-11 09:30:23 +0200 | [diff] [blame] | 519 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
| 520 | # ifdef CONFIG_PROVE_LOCKING |
Ingo Molnar | 3295f0e | 2008-08-11 10:30:30 +0200 | [diff] [blame] | 521 | # define lock_map_acquire(l) lock_acquire(l, 0, 0, 0, 2, NULL, _THIS_IP_) |
Peter Zijlstra | 4f3e752 | 2008-08-11 09:30:23 +0200 | [diff] [blame] | 522 | # else |
Ingo Molnar | 3295f0e | 2008-08-11 10:30:30 +0200 | [diff] [blame] | 523 | # define lock_map_acquire(l) lock_acquire(l, 0, 0, 0, 1, NULL, _THIS_IP_) |
Peter Zijlstra | 4f3e752 | 2008-08-11 09:30:23 +0200 | [diff] [blame] | 524 | # endif |
Ingo Molnar | 3295f0e | 2008-08-11 10:30:30 +0200 | [diff] [blame] | 525 | # define lock_map_release(l) lock_release(l, 1, _THIS_IP_) |
Peter Zijlstra | 4f3e752 | 2008-08-11 09:30:23 +0200 | [diff] [blame] | 526 | #else |
Ingo Molnar | 3295f0e | 2008-08-11 10:30:30 +0200 | [diff] [blame] | 527 | # define lock_map_acquire(l) do { } while (0) |
| 528 | # define lock_map_release(l) do { } while (0) |
Peter Zijlstra | 4f3e752 | 2008-08-11 09:30:23 +0200 | [diff] [blame] | 529 | #endif |
| 530 | |
Peter Zijlstra | 76b189e | 2008-09-10 09:57:35 +0200 | [diff] [blame] | 531 | #ifdef CONFIG_PROVE_LOCKING |
| 532 | # define might_lock(lock) \ |
| 533 | do { \ |
| 534 | typecheck(struct lockdep_map *, &(lock)->dep_map); \ |
| 535 | lock_acquire(&(lock)->dep_map, 0, 0, 0, 2, NULL, _THIS_IP_); \ |
| 536 | lock_release(&(lock)->dep_map, 0, _THIS_IP_); \ |
| 537 | } while (0) |
| 538 | # define might_lock_read(lock) \ |
| 539 | do { \ |
| 540 | typecheck(struct lockdep_map *, &(lock)->dep_map); \ |
| 541 | lock_acquire(&(lock)->dep_map, 0, 0, 1, 2, NULL, _THIS_IP_); \ |
| 542 | lock_release(&(lock)->dep_map, 0, _THIS_IP_); \ |
| 543 | } while (0) |
| 544 | #else |
| 545 | # define might_lock(lock) do { } while (0) |
| 546 | # define might_lock_read(lock) do { } while (0) |
| 547 | #endif |
| 548 | |
Paul E. McKenney | 0632eb3 | 2010-02-22 17:04:47 -0800 | [diff] [blame] | 549 | #ifdef CONFIG_PROVE_RCU |
| 550 | extern void lockdep_rcu_dereference(const char *file, const int line); |
| 551 | #endif |
| 552 | |
Ingo Molnar | fbb9ce95 | 2006-07-03 00:24:50 -0700 | [diff] [blame] | 553 | #endif /* __LINUX_LOCKDEP_H */ |