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 52