File /code/usr/include/linux/smp_lock.h

#ifndef __LINUX_SMPLOCK_H
#define __LINUX_SMPLOCK_H

#include <linux/config.h>

#ifndef CONFIG_SMP

#define lock_kernel()				do { } while(0)
#define unlock_kernel()				do { } while(0)
#define release_kernel_lock(task, cpu)		do { } while(0)
#define reacquire_kernel_lock(task)		do { } while(0)
#define kernel_locked() 1

#else

#include <asm/smplock.h>

#endif 

#endif