rt_spin_trylock
#define spin_trylock(lock) rt_spin_trylock(lock)
#define spin_trylock_irq(lock) rt_spin_trylock(lock)
return rt_spin_trylock(lock);
extern int rt_spin_trylock(spinlock_t *lock) __cond_acquires(true, lock);
EXPORT_SYMBOL(rt_spin_trylock);