Ejemplo n.º 1
0
int init_new_context(struct task_struct *tsk, struct mm_struct *mm)
{
	int index;
	int err;

again:
	if (!idr_pre_get(&mmu_context_idr, GFP_KERNEL))
		return -ENOMEM;

	spin_lock(&mmu_context_lock);
	err = idr_get_new_above(&mmu_context_idr, NULL, 1, &index);
	spin_unlock(&mmu_context_lock);

	if (err == -EAGAIN)
		goto again;
	else if (err)
		return err;

	if (index > MAX_CONTEXT) {
		spin_lock(&mmu_context_lock);
		idr_remove(&mmu_context_idr, index);
		spin_unlock(&mmu_context_lock);
		return -ENOMEM;
	}

	/* The old code would re-promote on fork, we don't do that
	 * when using slices as it could cause problem promoting slices
	 * that have been forced down to 4K
	 */
	if (slice_mm_new_context(mm))
		slice_set_user_psize(mm, mmu_virtual_psize);
	mm->context.id = index;

	return 0;
}
Ejemplo n.º 2
0
int init_new_context(struct task_struct *tsk, struct mm_struct *mm)
{
	int index;

	index = __init_new_context();
	if (index < 0)
		return index;

	if (slice_mm_new_context(mm))
		slice_set_user_psize(mm, mmu_virtual_psize);
	subpage_prot_init_new_context(mm);
	mm->context.id = index;
#ifdef CONFIG_PPC_ICSWX
	mm->context.cop_lockp = kmalloc(sizeof(spinlock_t), GFP_KERNEL);
	if (!mm->context.cop_lockp) {
		__destroy_context(index);
		subpage_prot_free(mm);
		mm->context.id = MMU_NO_CONTEXT;
		return -ENOMEM;
	}
	spin_lock_init(mm->context.cop_lockp);
#endif 

	return 0;
}
int init_new_context(struct task_struct *tsk, struct mm_struct *mm)
{
	int index;

	index = __init_new_context();
	if (index < 0)
		return index;

	/* The old code would re-promote on fork, we don't do that
	 * when using slices as it could cause problem promoting slices
	 * that have been forced down to 4K
	 */
	if (slice_mm_new_context(mm))
		slice_set_user_psize(mm, mmu_virtual_psize);
	subpage_prot_init_new_context(mm);
	mm->context.id = index;
#ifdef CONFIG_PPC_ICSWX
	mm->context.cop_lockp = kmalloc(sizeof(spinlock_t), GFP_KERNEL);
	if (!mm->context.cop_lockp) {
		__destroy_context(index);
		subpage_prot_free(mm);
		mm->context.id = MMU_NO_CONTEXT;
		return -ENOMEM;
	}
	spin_lock_init(mm->context.cop_lockp);
#endif /* CONFIG_PPC_ICSWX */

	return 0;
}
Ejemplo n.º 4
0
/*
 * Set up the context for a new address space.
 */
int init_new_context(struct task_struct *t, struct mm_struct *mm)
{
	pr_hard("initing context for mm @%p\n", mm);

	mm->context.id = MMU_NO_CONTEXT;
	mm->context.active = 0;

#ifdef CONFIG_PPC_MM_SLICES
	if (slice_mm_new_context(mm))
		slice_set_user_psize(mm, mmu_virtual_psize);
#endif

	return 0;
}