arch/um/include/asm/mmu_context.h

   1 /*
   2  * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
   3  * Licensed under the GPL
   4  */
   5
   6 #ifndef __UM_MMU_CONTEXT_H
   7 #define __UM_MMU_CONTEXT_H
   8
   9 #include <linux/sched.h>
  10 #include <asm/mmu.h>
  11
  12 extern void arch_dup_mmap(struct mm_struct *oldmm, struct mm_struct *mm);
  13 extern void arch_exit_mmap(struct mm_struct *mm);
  14
  15 #define deactivate_mm(tsk,mm)   do { } while (0)
  16
  17 extern void force_flush_all(void);
  18
  19 static inline void activate_mm(struct mm_struct *old, struct mm_struct *new)
  20 {
  21         /*
  22          * This is called by fs/exec.c and sys_unshare()
  23          * when the new ->mm is used for the first time.
  24          */
  25         __switch_mm(&new->context.id);
  26         arch_dup_mmap(old, new);
  27 }
  28
  29 static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
  30                              struct task_struct *tsk)
  31 {
  32         unsigned cpu = smp_processor_id();
  33
  34         if(prev != next){
  35                 cpumask_clear_cpu(cpu, mm_cpumask(prev));
  36                 cpumask_set_cpu(cpu, mm_cpumask(next));
  37                 if(next != &init_mm)
  38                         __switch_mm(&next->context.id);
  39         }
  40 }
  41
  42 static inline void enter_lazy_tlb(struct mm_struct *mm,
  43                                   struct task_struct *tsk)
  44 {
  45 }
  46
  47 extern int init_new_context(struct task_struct *task, struct mm_struct *mm);
  48
  49 extern void destroy_context(struct mm_struct *mm);
  50
  51 #endif