1. 根目录:
2. arch
3. parisc
4. include
5. asm
6. switch_to.h

#ifndef __PARISC_SWITCH_TO_H
#define __PARISC_SWITCH_TO_H

struct task_struct;

extern struct task_struct *_switch_to(struct task_struct *, struct task_struct *);

#define switch_to(prev, next, last) do {			\
	(last) = _switch_to(prev, next);			\
} while(0)

#endif /* __PARISC_SWITCH_TO_H */