コード例 #1
0
ファイル: exec.c プロジェクト: 303750856/linux-3.1 
void flush_thread(void)
{
	void *data = NULL;
	int ret;

	arch_flush_thread(&current->thread.arch);

	ret = unmap(&current->mm->context.id, 0, STUB_START, 0, &data);
	ret = ret || unmap(&current->mm->context.id, STUB_END,
			   host_task_size - STUB_END, 1, &data);
	if (ret) {
		printk(KERN_ERR "flush_thread - clearing address space failed, "
		       "err = %d\n", ret);
		force_sig(SIGKILL, current);
	}

	__switch_mm(&current->mm->context.id);
}
コード例 #2
0
/*
 * use_mm
 *	Makes the calling kernel thread take on the specified
 *	mm context.
 *	Called by the retry thread execute retries within the
 *	iocb issuer's mm context, so that copy_from/to_user
 *	operations work seamlessly for aio.
 *	(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;
	unsigned long flags;

	task_lock(tsk);
	active_mm = tsk->active_mm;
 	ipipe_mm_switch_protect(flags);
	if (active_mm != mm) {
		atomic_inc(&mm->mm_count);
		tsk->active_mm = mm;
	}
	tsk->mm = mm;
	__switch_mm(active_mm, mm, tsk);
 	ipipe_mm_switch_unprotect(flags);
	task_unlock(tsk);

	if (active_mm != mm)
		mmdrop(active_mm);
}