17 void __raw_spin_lock_init(raw_spinlock_t *lock, const char *name,  in __raw_spin_lock_init()  argument
22 	 * Make sure we are not reinitializing a held lock:  in __raw_spin_lock_init()
24 	debug_check_no_locks_freed((void *)lock, sizeof(*lock));  in __raw_spin_lock_init()
25 	lockdep_init_map_wait(&lock->dep_map, name, key, 0, inner);  in __raw_spin_lock_init()
27 	lock->raw_lock = (arch_spinlock_t)__ARCH_SPIN_LOCK_UNLOCKED;  in __raw_spin_lock_init()
28 	lock->magic = SPINLOCK_MAGIC;  in __raw_spin_lock_init()
29 	lock->owner = SPINLOCK_OWNER_INIT;  in __raw_spin_lock_init()
30 	lock->owner_cpu = -1;  in __raw_spin_lock_init()
36 void __rwlock_init(rwlock_t *lock, const char *name,  in __rwlock_init()  argument
41 	 * Make sure we are not reinitializing a held lock:  in __rwlock_init()
43 	debug_check_no_locks_freed((void *)lock, sizeof(*lock));  in __rwlock_init()
44 	lockdep_init_map_wait(&lock->dep_map, name, key, 0, LD_WAIT_CONFIG);  in __rwlock_init()
46 	lock->raw_lock = (arch_rwlock_t) __ARCH_RW_LOCK_UNLOCKED;  in __rwlock_init()
47 	lock->magic = RWLOCK_MAGIC;  in __rwlock_init()
48 	lock->owner = SPINLOCK_OWNER_INIT;  in __rwlock_init()
49 	lock->owner_cpu = -1;  in __rwlock_init()
55 static void spin_dump(raw_spinlock_t *lock, const char *msg)  in spin_dump()  argument
57 	struct task_struct *owner = READ_ONCE(lock->owner);  in spin_dump()
64 	printk(KERN_EMERG " lock: %pS, .magic: %08x, .owner: %s/%d, "  in spin_dump()
66 		lock, READ_ONCE(lock->magic),  in spin_dump()
69 		READ_ONCE(lock->owner_cpu));  in spin_dump()
73 static void spin_bug(raw_spinlock_t *lock, const char *msg)  in spin_bug()  argument
78 	spin_dump(lock, msg);  in spin_bug()
81 #define SPIN_BUG_ON(cond, lock, msg) if (unlikely(cond)) spin_bug(lock, msg)  argument
84 debug_spin_lock_before(raw_spinlock_t *lock)  in debug_spin_lock_before()  argument
86 	SPIN_BUG_ON(READ_ONCE(lock->magic) != SPINLOCK_MAGIC, lock, "bad magic");  in debug_spin_lock_before()
87 	SPIN_BUG_ON(READ_ONCE(lock->owner) == current, lock, "recursion");  in debug_spin_lock_before()
88 	SPIN_BUG_ON(READ_ONCE(lock->owner_cpu) == raw_smp_processor_id(),  in debug_spin_lock_before()
89 							lock, "cpu recursion");  in debug_spin_lock_before()
92 static inline void debug_spin_lock_after(raw_spinlock_t *lock)  in debug_spin_lock_after()  argument
94 	WRITE_ONCE(lock->owner_cpu, raw_smp_processor_id());  in debug_spin_lock_after()
95 	WRITE_ONCE(lock->owner, current);  in debug_spin_lock_after()
98 static inline void debug_spin_unlock(raw_spinlock_t *lock)  in debug_spin_unlock()  argument
100 	SPIN_BUG_ON(lock->magic != SPINLOCK_MAGIC, lock, "bad magic");  in debug_spin_unlock()
101 	SPIN_BUG_ON(!raw_spin_is_locked(lock), lock, "already unlocked");  in debug_spin_unlock()
102 	SPIN_BUG_ON(lock->owner != current, lock, "wrong owner");  in debug_spin_unlock()
103 	SPIN_BUG_ON(lock->owner_cpu != raw_smp_processor_id(),  in debug_spin_unlock()
104 							lock, "wrong CPU");  in debug_spin_unlock()
105 	WRITE_ONCE(lock->owner, SPINLOCK_OWNER_INIT);  in debug_spin_unlock()
106 	WRITE_ONCE(lock->owner_cpu, -1);  in debug_spin_unlock()
111  * the detection here with an unfair lock which can cause problem of its own.
113 void do_raw_spin_lock(raw_spinlock_t *lock)  in do_raw_spin_lock()  argument
115 	debug_spin_lock_before(lock);  in do_raw_spin_lock()
116 	arch_spin_lock(&lock->raw_lock);  in do_raw_spin_lock()
118 	debug_spin_lock_after(lock);  in do_raw_spin_lock()
121 int do_raw_spin_trylock(raw_spinlock_t *lock)  in do_raw_spin_trylock()  argument
123 	int ret = arch_spin_trylock(&lock->raw_lock);  in do_raw_spin_trylock()
127 		debug_spin_lock_after(lock);  in do_raw_spin_trylock()
133 	SPIN_BUG_ON(!ret, lock, "trylock failure on UP");  in do_raw_spin_trylock()
138 void do_raw_spin_unlock(raw_spinlock_t *lock)  in do_raw_spin_unlock()  argument
141 	debug_spin_unlock(lock);  in do_raw_spin_unlock()
142 	arch_spin_unlock(&lock->raw_lock);  in do_raw_spin_unlock()
146 static void rwlock_bug(rwlock_t *lock, const char *msg)  in rwlock_bug()  argument
153 		task_pid_nr(current), lock);  in rwlock_bug()
157 #define RWLOCK_BUG_ON(cond, lock, msg) if (unlikely(cond)) rwlock_bug(lock, msg)  argument
159 void do_raw_read_lock(rwlock_t *lock)  in do_raw_read_lock()  argument
161 	RWLOCK_BUG_ON(lock->magic != RWLOCK_MAGIC, lock, "bad magic");  in do_raw_read_lock()
162 	arch_read_lock(&lock->raw_lock);  in do_raw_read_lock()
165 int do_raw_read_trylock(rwlock_t *lock)  in do_raw_read_trylock()  argument
167 	int ret = arch_read_trylock(&lock->raw_lock);  in do_raw_read_trylock()
173 	RWLOCK_BUG_ON(!ret, lock, "trylock failure on UP");  in do_raw_read_trylock()
178 void do_raw_read_unlock(rwlock_t *lock)  in do_raw_read_unlock()  argument
180 	RWLOCK_BUG_ON(lock->magic != RWLOCK_MAGIC, lock, "bad magic");  in do_raw_read_unlock()
181 	arch_read_unlock(&lock->raw_lock);  in do_raw_read_unlock()
184 static inline void debug_write_lock_before(rwlock_t *lock)  in debug_write_lock_before()  argument
186 	RWLOCK_BUG_ON(lock->magic != RWLOCK_MAGIC, lock, "bad magic");  in debug_write_lock_before()
187 	RWLOCK_BUG_ON(lock->owner == current, lock, "recursion");  in debug_write_lock_before()
188 	RWLOCK_BUG_ON(lock->owner_cpu == raw_smp_processor_id(),  in debug_write_lock_before()
189 							lock, "cpu recursion");  in debug_write_lock_before()
192 static inline void debug_write_lock_after(rwlock_t *lock)  in debug_write_lock_after()  argument
194 	WRITE_ONCE(lock->owner_cpu, raw_smp_processor_id());  in debug_write_lock_after()
195 	WRITE_ONCE(lock->owner, current);  in debug_write_lock_after()
198 static inline void debug_write_unlock(rwlock_t *lock)  in debug_write_unlock()  argument
200 	RWLOCK_BUG_ON(lock->magic != RWLOCK_MAGIC, lock, "bad magic");  in debug_write_unlock()
201 	RWLOCK_BUG_ON(lock->owner != current, lock, "wrong owner");  in debug_write_unlock()
202 	RWLOCK_BUG_ON(lock->owner_cpu != raw_smp_processor_id(),  in debug_write_unlock()
203 							lock, "wrong CPU");  in debug_write_unlock()
204 	WRITE_ONCE(lock->owner, SPINLOCK_OWNER_INIT);  in debug_write_unlock()
205 	WRITE_ONCE(lock->owner_cpu, -1);  in debug_write_unlock()
208 void do_raw_write_lock(rwlock_t *lock)  in do_raw_write_lock()  argument
210 	debug_write_lock_before(lock);  in do_raw_write_lock()
211 	arch_write_lock(&lock->raw_lock);  in do_raw_write_lock()
212 	debug_write_lock_after(lock);  in do_raw_write_lock()
215 int do_raw_write_trylock(rwlock_t *lock)  in do_raw_write_trylock()  argument
217 	int ret = arch_write_trylock(&lock->raw_lock);  in do_raw_write_trylock()
220 		debug_write_lock_after(lock);  in do_raw_write_trylock()
225 	RWLOCK_BUG_ON(!ret, lock, "trylock failure on UP");  in do_raw_write_trylock()
230 void do_raw_write_unlock(rwlock_t *lock)  in do_raw_write_unlock()  argument
232 	debug_write_unlock(lock);  in do_raw_write_unlock()
233 	arch_write_unlock(&lock->raw_lock);  in do_raw_write_unlock()