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Fri, 27 Mar 2026 07:17:46 +0000 (GMT) From: Sayali Patil To: Andrew Morton , Shuah Khan , linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, Ritesh Harjani Cc: David Hildenbrand , Zi Yan , Michal Hocko , Oscar Salvador , Lorenzo Stoakes , Dev Jain , Liam.Howlett@oracle.com, linuxppc-dev@lists.ozlabs.org, Sayali Patil Subject: [PATCH v3 09/13] selftests/mm: skip uffd-wp-mremap if UFFD write-protect is unsupported Date: Fri, 27 Mar 2026 12:46:03 +0530 Message-ID: <5bc0fe27cdd316ef6f776bf9b52b6c0de4bef54f.1774591179.git.sayalip@linux.ibm.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMzI3MDA1MyBTYWx0ZWRfXy74mYcYDtW9E 66faNfVZecpGCcdK8XEu/3mVuDu8n3p83cekWLWd9D8b2FK9nSFVx/4Q71xL0M2WlEVOtGUkAWV rxHkk0TVItCPjtxNanBTViXsfbGdt9wPxFVEy/1q8wVKdcIjGAsw8PedtraXmxUo+yHdmMv+3vW Xaucssvchl/c+t9rLLCwR8OA6J2JX/rw1oPNmGururSiCU83JURHgTRLlKCdRD4Wby1LfzgOics q84t3IieEzdrDFb5JY64JuhDYlHueG4E4JptigDqHaXsu716VnAhdMgLyyauVGKZVfkR51NwlHZ IgrXZhncyDCveKlYwfn5hKih3Nq05eLfu9JUlpIruxvskamtWMLQZLoHA6hh6Ue+We83DpiPKuO 9pXyzxxNvg1YLCYtQ6TpfLmzCEjMzddRIOIno9/yrSTYR76BtI78eaTYPNNOQ7TxT0ECmwAgLqn lVVaiNAakvfDcAsivqw== X-Authority-Analysis: v=2.4 cv=JK42csKb c=1 sm=1 tr=0 ts=69c62f21 cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=Yq5XynenixoA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=V8glGbnc2Ofi9Qvn3v5h:22 a=Ikd4Dj_1AAAA:8 a=VwQbUJbxAAAA:8 a=VnNF1IyMAAAA:8 a=43jm8jFf0dXJBzv0ducA:9 X-Proofpoint-ORIG-GUID: mFA_b2akFxD__gB1wEB5-Q8CztuGwVMc X-Proofpoint-GUID: x7FQ4wwcmolayTjYtuQNTUgsPo3mnvAR X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-03-26_04,2026-03-26_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 clxscore=1015 priorityscore=1501 malwarescore=0 adultscore=0 spamscore=0 suspectscore=0 phishscore=0 lowpriorityscore=0 bulkscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2603050001 definitions=main-2603270053 X-Rspam-User: X-Rspamd-Queue-Id: CD8274000F X-Stat-Signature: e5yqas3h3o5u5q6hjj8qg33ocb9xs9qb X-Rspamd-Server: rspam06 X-HE-Tag: 1774595877-765204 X-HE-Meta: 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 5A1l7onW 0P3CwtqKrtRY33orUia5GnD3GO6Jpq/INFgntxTTn19yh8Rr2YV2oFcBoou03CtjjHJFrQwRULI/1IU3Mqw4BAh2VbdPlCt6a0GPwyMkGVSEUWo7rhfm6St8+c3/zX2Gkac2xXdR0OP1+ZSMzJ8BiuMf1OGUeA3JIaFQXy2ukY/EvHv8Xw5HUeng7ZRkJ3ICeFLSYHuzcSrAXDMPy6KRoGb9pnTcJ6B6y0sfkGX0aQkelZz5DxCTDt/cxhE0rq6PUSrKj+ZR7Kr0J9ZaGGJ6+/3+6ny4a+geIiOW7S5BEa8DxVEeVVo4Xg83yqDZGqfUVA+oX5uuXLJe6UcVB/MCtATg517IB4inLMx/yo0xGmLlfzeQQEHEiuA8V05Kid4MdeSTWwfwgkj1mGiiFAIV5Wxwx8xI+iw4vm8Vi Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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 Acked-by: David Hildenbrand (Arm) 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..6edbd09f0ca6 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 check_uffd_wp_feature_supported(void) +{ + uint64_t features; + + if (uffd_get_features(&features) && errno == ENOENT) + ksft_exit_skip("failed to get available features (%d)\n", errno); + + if (!(features & UFFD_FEATURE_PAGEFAULT_FLAG_WP)) + ksft_exit_skip("uffd-wp feature not supported\n"); +} + static int detect_thp_sizes(size_t sizes[], int max) { int count = 0; @@ -336,6 +347,8 @@ int main(int argc, char **argv) struct thp_settings settings; int i, j, plan = 0; + check_uffd_wp_feature_supported(); + pagesize = getpagesize(); nr_thpsizes = detect_thp_sizes(thpsizes, ARRAY_SIZE(thpsizes)); nr_hugetlbsizes = detect_hugetlb_page_sizes(hugetlbsizes, -- 2.52.0