linux-kernel - Re: [PATCH v1] selftests/mm: sigbus-wp test requires UFFD_FEATURE_WP_HUGETLBFS

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Date: Thu, 21 Mar 2024 16:29:22 -0700
From: Andrew Morton <akpm@...ux-foundation.org>
To: Edward Liaw <edliaw@...gle.com>
Cc: linux-kernel@...r.kernel.org, Shuah Khan <shuah@...nel.org>,
 linux-kselftest@...r.kernel.org, kernel-team@...roid.com,
 linux-mm@...ck.org, Peter Xu <peterx@...hat.com>
Subject: Re: [PATCH v1] selftests/mm: sigbus-wp test requires
 UFFD_FEATURE_WP_HUGETLBFS_SHMEM

On Thu, 21 Mar 2024 23:20:21 +0000 Edward Liaw <edliaw@...gle.com> wrote:

> The sigbus-wp test requires the UFFD_FEATURE_WP_HUGETLBFS_SHMEM flag for
> shmem and hugetlb targets.  Otherwise it is not backwards compatible
> with kernels <5.19 and fails with EINVAL.
> 
> ...
>
> --- a/tools/testing/selftests/mm/uffd-unit-tests.c
> +++ b/tools/testing/selftests/mm/uffd-unit-tests.c
> @@ -1437,7 +1437,8 @@ uffd_test_case_t uffd_tests[] = {
>  		.uffd_fn = uffd_sigbus_wp_test,
>  		.mem_targets = MEM_ALL,
>  		.uffd_feature_required = UFFD_FEATURE_SIGBUS |
> -		UFFD_FEATURE_EVENT_FORK | UFFD_FEATURE_PAGEFAULT_FLAG_WP,
> +		UFFD_FEATURE_EVENT_FORK | UFFD_FEATURE_PAGEFAULT_FLAG_WP |
> +		UFFD_FEATURE_WP_HUGETLBFS_SHMEM,
>  	},
>  	{
>  		.name = "events",

Thanks, I'll add

Fixes: 73c1ea939b65 ("selftests/mm: move uffd sig/events tests into uffd unit tests")
Cc: <stable@...r.kernel.org>