Re: [PATCH 2/2] selftests/mm: add a uffd test for re-registering during UFFDIO_COPY

[Mike Rapoport <rppt@kernel.org>]

On Thu, Oct 29, 2026 at 11:11:02PM +0100, Jose A. Perez de Azpillaga wrote:
> Re-register the destination without WP while a UFFDIO_COPY_MODE_WP copy
> waits for its source page, then check that the copy fails with -EINVAL
> and leaves no uffd-wp bit behind. This covers both the hugetlb and the
> non-hugetlb UFFDIO_COPY retry.

maybe "all memory types"?

> Signed-off-by: Jose A. Perez de Azpillaga <azpijr@gmail.com>
> ---
>  tools/testing/selftests/mm/uffd-unit-tests.c | 105 +++++++++++++++++++
>  1 file changed, 105 insertions(+)
> 
> diff --git a/tools/testing/selftests/mm/uffd-unit-tests.c b/tools/testing/selftests/mm/uffd-unit-tests.c
> index 2a97ba1d6feb..8a7efaa7b3ac 100644
> --- a/tools/testing/selftests/mm/uffd-unit-tests.c
> +++ b/tools/testing/selftests/mm/uffd-unit-tests.c
> @@ -375,6 +375,104 @@ static void uffd_wp_unpopulated_test(uffd_global_test_opts_t *gopts, uffd_test_a
>  	uffd_test_pass();
>  }
>  
> +struct wp_copy_args {
> +	uffd_global_test_opts_t *gopts;
> +	char *src;
> +	__s64 copy;

maybe result?

The rest looks Ok.

-- 
Sincerely yours,
Mike.