linux/include/asm-generic/switch_to.h
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   1/* Generic task switch macro wrapper, based on MN10300 definitions.
   2 *
   3 * It should be possible to use these on really simple architectures,
   4 * but it serves more as a starting point for new ports.
   5 *
   6 * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
   7 * Written by David Howells (dhowells@redhat.com)
   8 *
   9 * This program is free software; you can redistribute it and/or
  10 * modify it under the terms of the GNU General Public Licence
  11 * as published by the Free Software Foundation; either version
  12 * 2 of the Licence, or (at your option) any later version.
  13 */
  14#ifndef __ASM_GENERIC_SWITCH_TO_H
  15#define __ASM_GENERIC_SWITCH_TO_H
  16
  17#include <linux/thread_info.h>
  18
  19/*
  20 * Context switching is now performed out-of-line in switch_to.S
  21 */
  22extern struct task_struct *__switch_to(struct task_struct *,
  23                                       struct task_struct *);
  24
  25#define switch_to(prev, next, last)                                     \
  26        do {                                                            \
  27                ((last) = __switch_to((prev), (next)));                 \
  28        } while (0)
  29
  30#endif /* __ASM_GENERIC_SWITCH_TO_H */
  31
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