#ifndef __ALPHA_SWITCH_TO_H
  #define __ALPHA_SWITCH_TO_H
  
  
  struct task_struct;
  extern struct task_struct *alpha_switch_to(unsigned long, struct task_struct *);
  
  #define switch_to(P,N,L)						 \
    do {									 \
      (L) = alpha_switch_to(virt_to_phys(&task_thread_info(N)->pcb), (P)); \
      check_mmu_context();						 \
    } while (0)
  
  #endif /* __ALPHA_SWITCH_TO_H */