[PATCH hmm 02/15] mm/mmu_notifier: add an interval tree notifier

[Jason Gunthorpe]

On Tue, Oct 15, 2019 at 03:12:29PM -0300, Jason Gunthorpe wrote:

> +static void mn_itree_release(struct mmu_notifier_mm *mmn_mm,
> +			     struct mm_struct *mm)
> +{
> +	struct mmu_notifier_range range = {
> +		.flags = MMU_NOTIFIER_RANGE_BLOCKABLE,
> +		.event = MMU_NOTIFY_RELEASE,
> +		.mm = mm,
> +		.start = 0,
> +		.end = ULONG_MAX,
> +	};
> +	struct mmu_range_notifier *mrn;
> +	unsigned long cur_seq;
> +	bool ret;
> +
> +	for (mrn = mn_itree_inv_start_range(mmn_mm, &range, &cur_seq); mrn;
> +	     mrn = mn_itree_inv_next(mrn, &range)) {
> +		ret = mrn->ops->invalidate(mrn, &range);
> +		WARN_ON(ret);

This should be 
  WARN_ON(!ret)

Jason