9  * Simple spin lock operations.  There are two variants, one clears IRQ's
15 #define arch_spin_lock_flags(lock, flags) arch_spin_lock(lock)  argument
16 #define arch_spin_is_locked(x)	((x)->lock != 0)
18 		do { cpu_relax(); } while ((x)->lock)
20 static inline void arch_spin_unlock(arch_spinlock_t * lock)  in arch_spin_unlock()  argument
23 	lock->lock = 0;  in arch_spin_unlock()
26 static inline void arch_spin_lock(arch_spinlock_t * lock)  in arch_spin_lock()  argument
42 	: "=&r" (tmp), "=m" (lock->lock)  in arch_spin_lock()
43 	: "m"(lock->lock) : "memory");  in arch_spin_lock()
46 static inline int arch_spin_trylock(arch_spinlock_t *lock)  in arch_spin_trylock()  argument
48 	return !test_and_set_bit(0, &lock->lock);  in arch_spin_trylock()
53 static inline int arch_read_can_lock(arch_rwlock_t *lock)  in arch_read_can_lock()  argument
55 	return (lock->lock & 1) == 0;  in arch_read_can_lock()
58 static inline int arch_write_can_lock(arch_rwlock_t *lock)  in arch_write_can_lock()  argument
60 	return lock->lock == 0;  in arch_write_can_lock()
63 static inline void arch_read_lock(arch_rwlock_t *lock)  in arch_read_lock()  argument
79 	: "=m" (*lock), "=&r" (regx)  in arch_read_lock()
80 	: "m" (*lock) : "memory");  in arch_read_lock()
83 static inline void arch_write_lock(arch_rwlock_t *lock)  in arch_write_lock()  argument
99 	: "=m" (*lock), "=&r" (regx)  in arch_write_lock()
100 	: "m" (*lock) : "memory");  in arch_write_lock()
103 static inline int arch_read_trylock(arch_rwlock_t * lock)  in arch_read_trylock()  argument
119 	: "=m" (*lock), "=&r" (regx), "=&r" (success)  in arch_read_trylock()
120 	: "m" (*lock) : "memory");  in arch_read_trylock()
125 static inline int arch_write_trylock(arch_rwlock_t * lock)  in arch_write_trylock()  argument
141 	: "=m" (*lock), "=&r" (regx), "=&r" (success)  in arch_write_trylock()
142 	: "m" (*lock) : "memory");  in arch_write_trylock()
147 static inline void arch_read_unlock(arch_rwlock_t * lock)  in arch_read_unlock()  argument
159 	: "=m" (*lock), "=&r" (regx)  in arch_read_unlock()
160 	: "m" (*lock) : "memory");  in arch_read_unlock()
163 static inline void arch_write_unlock(arch_rwlock_t * lock)  in arch_write_unlock()  argument
166 	lock->lock = 0;  in arch_write_unlock()
169 #define arch_read_lock_flags(lock, flags) arch_read_lock(lock)  argument
170 #define arch_write_lock_flags(lock, flags) arch_write_lock(lock)  argument
172 #define arch_spin_relax(lock)	cpu_relax()  argument
173 #define arch_read_relax(lock)	cpu_relax()  argument
174 #define arch_write_relax(lock)	cpu_relax()  argument