Re: [PATCH v2 10/31] selftests/mm: Test UFFDIO_ZEROPAGE only when !hugetlb

[Axel Rasmussen]

On Wed, Apr 12, 2023 at 9:42 AM Peter Xu <peterx@xxxxxxxxxx> wrote:
>
> Make the check as simple as "test_type == TEST_HUGETLB" because that's the
> only mem that doesn't support ZEROPAGE.
>
> Signed-off-by: Peter Xu <peterx@xxxxxxxxxx>

The end state we get to in patch 26 is what I was hoping for - we
check the ioctls reported by UFFDIO_REGISTER to decide if we rest this
or not. So then this intermediate state used to get rid of
get_expected_ioctls() is fine.

Reviewed-by: Axel Rasmussen <axelrasmussen@xxxxxxxxxx>

> ---
>  tools/testing/selftests/mm/userfaultfd.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/tools/testing/selftests/mm/userfaultfd.c b/tools/testing/selftests/mm/userfaultfd.c
> index 795fbc4d84f8..d724f1c78847 100644
> --- a/tools/testing/selftests/mm/userfaultfd.c
> +++ b/tools/testing/selftests/mm/userfaultfd.c
> @@ -1118,7 +1118,7 @@ static int __uffdio_zeropage(int ufd, unsigned long offset, bool retry)
>  {
>         struct uffdio_zeropage uffdio_zeropage;
>         int ret;
> -       bool has_zeropage = get_expected_ioctls(0) & (1 << _UFFDIO_ZEROPAGE);
> +       bool has_zeropage = !(test_type == TEST_HUGETLB);
>         __s64 res;
>
>         if (offset >= nr_pages * page_size)
> --
> 2.39.1
>