original_kernel/arch/parisc/include/asm/switch_to.h

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#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 */