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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 ([email protected])
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 */