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Thu, 12 Mar 2026 12:50:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1773319822; bh=adjljW+VNbO+pN1pMra4pZwRC1mZke1wNpJ+7Qa+hJ4=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=R3VxknODXNCIPm7LSy8wUZk8DApPOKFgkwpKvijaRHBrYIEUoEwRgOLK7boYLNW1O b1Picp4lm4PXJWe1N9ubhs0Qg4gsdrTZgFn5Rtsgx2uMZkdce17nMRfmoOPtGDda51 L85Kv79rMkwquASxcKxRCTRcJ3EMqOVJKIqOFZUGK+VLE4MRwBgqNf0VFW0PbehFd8 FyBVTJp6tW61g89/dUb97UcWJTyj+pzroFsrt55cPMGj6CowugbTL/bR+dnO0Uz30B eUcpGwOpiB3HeKsgDMK3Lk7EQ5iMpDDKnxk7YbqHjy1BM/D1sJxOGx46a/qXnAjbYE UNd/jtMKxTJ2w== Message-ID: <457dddf1-04ec-4d1e-8640-b04997fac4f1@kernel.org> Date: Thu, 12 Mar 2026 13:50:17 +0100 X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 09/13] selftests/mm: skip uffd-wp-mremap if UFFD write-protect is unsupported To: Sayali Patil , Andrew Morton , Shuah Khan , linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, Ritesh Harjani Cc: Zi Yan , Michal Hocko , Oscar Salvador , Lorenzo Stoakes , Dev Jain , Liam.Howlett@oracle.com, linuxppc-dev@lists.ozlabs.org References: From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 3/12/26 13:25, Sayali Patil wrote: > The uffd-wp-mremap test requires the UFFD_FEATURE_PAGEFAULT_FLAG_WP > capability. On systems where userfaultfd write-protect is > not supported, uffd_register() fails and the test reports failures. > > Check for the required feature at startup and skip the test when the > UFFD_FEATURE_PAGEFAULT_FLAG_WP capability is not present, > preventing false failures on unsupported configurations. > > Before patch: > running ./uffd-wp-mremap > ------------------------ > [INFO] detected THP size: 256 KiB > [INFO] detected THP size: 512 KiB > [INFO] detected THP size: 1024 KiB > [INFO] detected THP size: 2048 KiB > [INFO] detected hugetlb page size: 2048 KiB > [INFO] detected hugetlb page size: 1048576 KiB > 1..24 > [RUN] test_one_folio(size=65536, private=false, swapout=false, > hugetlb=false) > not ok 1 uffd_register() failed > [RUN] test_one_folio(size=65536, private=true, swapout=false, > hugetlb=false) > not ok 2 uffd_register() failed > [RUN] test_one_folio(size=65536, private=false, swapout=true, > hugetlb=false) > not ok 3 uffd_register() failed > [RUN] test_one_folio(size=65536, private=true, swapout=true, > hugetlb=false) > not ok 4 uffd_register() failed > [RUN] test_one_folio(size=262144, private=false, swapout=false, > hugetlb=false) > not ok 5 uffd_register() failed > [RUN] test_one_folio(size=524288, private=false, swapout=false, > hugetlb=false) > not ok 6 uffd_register() failed > . > . > . > Bail out! 24 out of 24 tests failed > Totals: pass:0 fail:24 xfail:0 xpass:0 skip:0 error:0 > [FAIL] > not ok 1 uffd-wp-mremap # exit=1 > > After patch: > running ./uffd-wp-mremap > ------------------------ > 1..0 # SKIP uffd-wp feature not supported > [SKIP] > ok 1 uffd-wp-mremap # SKIP > > Acked-by: Zi Yan > Signed-off-by: Sayali Patil > --- > tools/testing/selftests/mm/uffd-wp-mremap.c | 13 +++++++++++++ > 1 file changed, 13 insertions(+) > > diff --git a/tools/testing/selftests/mm/uffd-wp-mremap.c b/tools/testing/selftests/mm/uffd-wp-mremap.c > index 17186d4a4147..73d53a4da389 100644 > --- a/tools/testing/selftests/mm/uffd-wp-mremap.c > +++ b/tools/testing/selftests/mm/uffd-wp-mremap.c > @@ -19,6 +19,17 @@ static size_t thpsizes[20]; > static int nr_hugetlbsizes; > static size_t hugetlbsizes[10]; > > +static void uffd_wp_feature_supported(void) Likely that function should be called "check_uffd_wp_feature_supported()" Because right now it reads as if it would be returning a bool. Acked-by: David Hildenbrand (Arm) -- Cheers, David