Don't include linux/config.h from anywhere else in include/
[linux-2.6.git] / include / asm-frv / mmu_context.h
1 /* mmu_context.h: MMU context management routines
2  *
3  * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
4  * Written by David Howells (dhowells@redhat.com)
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_MMU_CONTEXT_H
13 #define _ASM_MMU_CONTEXT_H
14
15 #include <asm/setup.h>
16 #include <asm/page.h>
17 #include <asm/pgalloc.h>
18
19 static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
20 {
21 }
22
23 #ifdef CONFIG_MMU
24 extern int init_new_context(struct task_struct *tsk, struct mm_struct *mm);
25 extern void change_mm_context(mm_context_t *old, mm_context_t *ctx, pgd_t *_pgd);
26 extern void destroy_context(struct mm_struct *mm);
27
28 #else
29 #define init_new_context(tsk, mm)               ({ 0; })
30 #define change_mm_context(old, ctx, _pml4)      do {} while(0)
31 #define destroy_context(mm)                     do {} while(0)
32 #endif
33
34 #define switch_mm(prev, next, tsk)                                              \
35 do {                                                                            \
36         if (prev != next)                                                       \
37                 change_mm_context(&prev->context, &next->context, next->pgd);   \
38 } while(0)
39
40 #define activate_mm(prev, next)                                         \
41 do {                                                                    \
42         change_mm_context(&prev->context, &next->context, next->pgd);   \
43 } while(0)
44
45 #define deactivate_mm(tsk, mm)                  \
46 do {                                            \
47 } while(0)
48
49 #endif