22     int8_t lock; // 1:unlocked 0:locked  member
25 extern void __arch_spin_lock(spinlock_t *lock);
26 extern void __arch_spin_unlock(spinlock_t *lock);
28 extern void __arch_spin_lock_no_preempt(spinlock_t *lock);
29 extern void __arch_spin_unlock_no_preempt(spinlock_t *lock);
31 extern long __arch_spin_trylock(spinlock_t *lock);
38 void spin_lock(spinlock_t *lock)  in spin_lock()  argument
40     __arch_spin_lock(lock);  in spin_lock()
48 void spin_unlock(spinlock_t *lock)  in spin_unlock()  argument
50     __arch_spin_unlock(lock);  in spin_unlock()
58 void spin_init(spinlock_t *lock)  in spin_init()  argument
61     lock->lock = 1;  in spin_init()
70 void spin_lock_no_preempt(spinlock_t *lock)  in spin_lock_no_preempt()  argument
72     __arch_spin_lock_no_preempt(lock);  in spin_lock_no_preempt()
80 void spin_unlock_no_preempt(spinlock_t *lock)  in spin_unlock_no_preempt()  argument
82     __arch_spin_unlock_no_preempt(lock);  in spin_unlock_no_preempt()
91 long spin_trylock(spinlock_t *lock)  in spin_trylock()  argument
93     return __arch_spin_trylock(lock);  in spin_trylock()
100 #define spin_lock_irqsave(lock, flags)                                                             …  argument
104 …spin_lock(lock);                                                                                  …
111 #define spin_unlock_irqrestore(lock, flags)                                                        …  argument
114 …spin_unlock(lock);                                                                                …
122 #define spin_lock_irq(lock)                                                                        …  argument
126 …spin_lock(lock);                                                                                  …
133 #define spin_unlock_irq(lock)                                                                      …  argument
136 …spin_unlock(lock);                                                                                …
147 static inline bool spin_is_locked(const spinlock_t *lock)  in spin_is_locked()  argument
149     int x = READ_ONCE(lock->lock);  in spin_is_locked()
153 #define assert_spin_locked(lock) BUG_ON(!spin_is_locked(lock))  argument