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62 lines
1.3 KiB
62 lines
1.3 KiB
/* Copyright (C) 2009 Red Hat, Inc. |
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* |
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* See ../COPYING for licensing terms. |
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*/ |
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#include <linux/mm.h> |
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#include <linux/mmu_context.h> |
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#include <linux/export.h> |
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#include <linux/sched.h> |
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#include <asm/mmu_context.h> |
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/* |
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* use_mm |
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* Makes the calling kernel thread take on the specified |
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* mm context. |
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* (Note: this routine is intended to be called only |
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* from a kernel thread context) |
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*/ |
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void use_mm(struct mm_struct *mm) |
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{ |
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struct mm_struct *active_mm; |
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struct task_struct *tsk = current; |
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task_lock(tsk); |
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active_mm = tsk->active_mm; |
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if (active_mm != mm) { |
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atomic_inc(&mm->mm_count); |
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tsk->active_mm = mm; |
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} |
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tsk->mm = mm; |
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switch_mm(active_mm, mm, tsk); |
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task_unlock(tsk); |
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#ifdef finish_arch_post_lock_switch |
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finish_arch_post_lock_switch(); |
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#endif |
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if (active_mm != mm) |
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mmdrop(active_mm); |
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} |
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EXPORT_SYMBOL_GPL(use_mm); |
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/* |
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* unuse_mm |
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* Reverses the effect of use_mm, i.e. releases the |
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* specified mm context which was earlier taken on |
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* by the calling kernel thread |
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* (Note: this routine is intended to be called only |
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* from a kernel thread context) |
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*/ |
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void unuse_mm(struct mm_struct *mm) |
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{ |
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struct task_struct *tsk = current; |
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task_lock(tsk); |
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sync_mm_rss(mm); |
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tsk->mm = NULL; |
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/* active_mm is still 'mm' */ |
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enter_lazy_tlb(mm, tsk); |
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task_unlock(tsk); |
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} |
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EXPORT_SYMBOL_GPL(unuse_mm);
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