include/asm-generic/switch_to.h

   1 /* Generic task switch macro wrapper.
   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  */
  22 extern 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 */