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Linux/arch/frv/include/asm/mmu_context.h

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  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 #include <asm-generic/mm_hooks.h>
 19 
 20 static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
 21 {
 22 }
 23 
 24 #ifdef CONFIG_MMU
 25 extern int init_new_context(struct task_struct *tsk, struct mm_struct *mm);
 26 extern void change_mm_context(mm_context_t *old, mm_context_t *ctx, pgd_t *_pgd);
 27 extern void destroy_context(struct mm_struct *mm);
 28 
 29 #else
 30 #define init_new_context(tsk, mm)               ({ 0; })
 31 #define change_mm_context(old, ctx, _pml4)      do {} while(0)
 32 #define destroy_context(mm)                     do {} while(0)
 33 #endif
 34 
 35 #define switch_mm(prev, next, tsk)                                              \
 36 do {                                                                            \
 37         if (prev != next)                                                       \
 38                 change_mm_context(&prev->context, &next->context, next->pgd);   \
 39 } while(0)
 40 
 41 #define activate_mm(prev, next)                                         \
 42 do {                                                                    \
 43         change_mm_context(&prev->context, &next->context, next->pgd);   \
 44 } while(0)
 45 
 46 #define deactivate_mm(tsk, mm)                  \
 47 do {                                            \
 48 } while(0)
 49 
 50 #endif
 51 

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