Release 4.11 mm/mmu_context.c

/* Copyright (C) 2009 Red Hat, Inc.
 *
 * See ../COPYING for licensing terms.
 */

#include <linux/mm.h>
#include <linux/sched.h>
#include <linux/sched/mm.h>
#include <linux/sched/task.h>
#include <linux/mmu_context.h>
#include <linux/export.h>

#include <asm/mmu_context.h>

/*
 * use_mm
 *      Makes the calling kernel thread take on the specified
 *      mm context.
 *      (Note: this routine is intended to be called only
 *      from a kernel thread context)
 */


void use_mm(struct mm_struct *mm)
{
	struct mm_struct *active_mm;
	struct task_struct *tsk = current;

	task_lock(tsk);
	active_mm = tsk->active_mm;
	if (active_mm != mm) {
		mmgrab(mm);
		tsk->active_mm = mm;
	}
	tsk->mm = mm;
	switch_mm(active_mm, mm, tsk);
	task_unlock(tsk);
#ifdef finish_arch_post_lock_switch
	finish_arch_post_lock_switch();
#endif

	if (active_mm != mm)
		mmdrop(active_mm);
}
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4
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EXPORT_SYMBOL_GPL(use_mm);

/*
 * unuse_mm
 *      Reverses the effect of use_mm, i.e. releases the
 *      specified mm context which was earlier taken on
 *      by the calling kernel thread
 *      (Note: this routine is intended to be called only
 *      from a kernel thread context)
 */


void unuse_mm(struct mm_struct *mm)
{
	struct task_struct *tsk = current;

	task_lock(tsk);
	sync_mm_rss(mm);
	tsk->mm = NULL;
	/* active_mm is still 'mm' */
	enter_lazy_tlb(mm, tsk);
	task_unlock(tsk);
}
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EXPORT_SYMBOL_GPL(unuse_mm);
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Michael S. Tsirkin
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Martin Schwidefsky
8
4.68%
1
10.00%
Vegard Nossum
1
0.58%
1
10.00%
Zach Brown
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171
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10
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Directory: mm

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