Re: [PATCH v2 1/2] mm/gup.c: Don't pass gup_flags to check_and_migrate_movable_pages()

[Jason Gunthorpe]

On Fri, Aug 05, 2022 at 04:29:52PM +1000, Alistair Popple wrote:
> @@ -2053,7 +2046,9 @@ static long __gup_longterm_locked(struct mm_struct *mm,
>  					     NULL, gup_flags);
>  		if (rc <= 0)
>  			break;
> -		rc = check_and_migrate_movable_pages(rc, pages, gup_flags);
> +
> +		WARN_ON_ONCE(!(gup_flags & FOLL_PIN));
> +		rc = check_and_migrate_movable_pages(rc, pages);

This should be moved up:

	if (!(gup_flags & FOLL_LONGTERM))
		return __get_user_pages_locked(mm, start, nr_pages, pages, vmas,
					       NULL, gup_flags);
	if (WARN_ON(!(gup_flags & FOLL_PIN)))
	   return  -EINVAL;
	flags = memalloc_pin_save();

Jason