Linux Kernel  3.7.1
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
switch_to.h
Go to the documentation of this file.
1 /* FR-V CPU basic task switching
2  *
3  * Copyright (C) 2003 Red Hat, Inc. All Rights Reserved.
4  * Written by David Howells ([email protected])
5  *
6  * This program is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU General Public License
8  * as published by the Free Software Foundation; either version
9  * 2 of the License, or (at your option) any later version.
10  */
11 
12 #ifndef _ASM_SWITCH_TO_H
13 #define _ASM_SWITCH_TO_H
14 
15 #include <linux/thread_info.h>
16 
17 /*
18  * switch_to(prev, next) should switch from task `prev' to `next'
19  * `prev' will never be the same as `next'.
20  * The `mb' is to tell GCC not to cache `current' across this call.
21  */
22 extern asmlinkage
23 struct task_struct *__switch_to(struct thread_struct *prev_thread,
24  struct thread_struct *next_thread,
25  struct task_struct *prev);
26 
27 #define switch_to(prev, next, last) \
28 do { \
29  (prev)->thread.sched_lr = \
30  (unsigned long) __builtin_return_address(0); \
31  (last) = __switch_to(&(prev)->thread, &(next)->thread, (prev)); \
32  mb(); \
33 } while(0)
34 
35 #endif /* _ASM_SWITCH_TO_H */