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1. Symmetric MultiMulti-Processing multi processor (core)  architecurure

It is in include/linux/spinlock_api_smp.h

static inline void __spin_lock(spinlock_t *lock)

{

preempt_disable();

spin_acquire(&lock->dep_map, 0, 0, _RET_IP_);

LOCK_CONTENDED(lock, _raw_spin_trylock, _raw_spin_lock);

}

2. Single Processor uni processor (core) architecuture

It is in include/linux/spinlock_api_up.h

#define _raw_spin_lock(lock) __LOCK(lock)

#define __LOCK(lock) /

 do { preempt_disable(); __acquire(lock); (void)(lock); } while (0)

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