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Tue, 14 Apr 2026 08:22:55 +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, Miaohe Lin , Venkat Rao Bagalkote , Sayali Patil Subject: [PATCH v5 09/14] selftest/mm: register existing mapping with userfaultfd in hugepage-mremap Date: Tue, 14 Apr 2026 13:52:03 +0530 Message-ID: <37b8bdb379a845beaba645c104fb0cc31aca57ac.1776150071.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-Authority-Analysis: v=2.4 cv=I/dVgtgg c=1 sm=1 tr=0 ts=69ddf969 cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=A5OVakUREuEA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=V8glGbnc2Ofi9Qvn3v5h:22 a=VwQbUJbxAAAA:8 a=VnNF1IyMAAAA:8 a=gVE5Qc0x_BWLnb-D2gsA:9 X-Proofpoint-GUID: TfL428gbz9wY0OGEa0YNiF696CJtIz0I X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDE0MDA3NyBTYWx0ZWRfX0IHV8b100D7a BPxPYmJFDKnRm2Brk98k8pxEgIkMSssYwMzoexj05OtaYCHQTzCGiBinQfX54BjvfO1MD8FvJSu HAaxNnRBRB61TwCab3HxBR/pJbzPs1aAGBPSEDq35Rdf4YsBOwirUIw0N65qf5z4h+d0p0qtPIR FXmbBO1maiIwmzAHF4UsUlfGA9CUlMsYtJq75SlT5548tGdcmlUvh9xycrk9MFwxs04x8/MSYuP 5hwe1J/C0/sPzal1vBJ/n3BW8aNYN8UVW1opXBFdM67fQM4xysAcF/LcFakaink06PwfGmKPRyg cu63y1vdRwrcmYE4S9KCV/9E2spkp+QRZEiRE/Ct1q14nu4cSbzHpxfGa/+PpSuI0WwvMkWjCuc PxubKnzfj2o8m5kmMKNNTFBmWyNFU4Ocaq7xjsnyiQSr8FSH+YwVfUTcMLBcJYF/9h2NmDS7FYB rso24PSTam64o4brI3A== X-Proofpoint-ORIG-GUID: qMABBfHeIhCOuLcikZRA_GA1scV5rCuK 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=2026-04-14_02,2026-04-13_04,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 bulkscore=0 clxscore=1015 adultscore=0 lowpriorityscore=0 suspectscore=0 impostorscore=0 phishscore=0 spamscore=0 priorityscore=1501 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604070000 definitions=main-2604140077 X-Rspamd-Server: rspam12 X-Stat-Signature: ecwzpcw1shgyjq5yuzt3qcp8jpqs7nj3 X-Rspamd-Queue-Id: D7D171C0003 X-Rspam-User: X-HE-Tag: 1776154995-756086 X-HE-Meta: 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 FaDZNN8l yOnva84tvuj1jhBdccqlXQRkC8Z6RH7c3tAUpq/IHx8Bptkna44W9i5iXoThEwTOqdkzTIBm9k67Vz11RySskxlHRmTq/uvfkkywsK/ce1QuoPURw2FkfaD5OO9Ax5JgntsUaNMWvRQaQaabPv8t5xOiQWrkfVJ4PBiVrwn+niuIv5+IjmZDzRVai4yekmVwE+SHTZAe3i+9jrKqnLd5HGvPNVJka4xjyGugwDYxvN9TI5fFMVQgLUAP2ervmD8nSAjetPTIAGqmirmlv3ZX+bGxPNl8up7ze0CkkMLRF5NxmeqW0K3Wiy8D8k3tO80MpItGRaBsDziI2kxRGY2iBAHjoo9wbgla6X7yGnIHg4viZDsMOTCOiGR5dR+94wIRF6vQ1wRu0XSi5Pqs= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Previously, register_region_with_uffd() created a new anonymous mapping and overwrote the address supplied by the caller before registering the range with userfaultfd. As a result, userfaultfd was applied to an unrelated anonymous mapping instead of the hugetlb region used by the test. Remove the extra mmap() and register the caller-provided address range directly using UFFDIO_REGISTER_MODE_MISSING, so that faults are generated for the hugetlb mapping used by the test. This ensures userfaultfd operates on the actual hugetlb test region and validates the expected fault handling. Before patch: running ./hugepage-mremap ------------------------- TAP version 13 1..1 Map haddr: Returned address is 0x7eaa40000000 Map daddr: Returned address is 0x7daa40000000 Map vaddr: Returned address is 0x7faa40000000 Address returned by mmap() = 0x7fff9d000000 Mremap: Returned address is 0x7faa40000000 First hex is 0 First hex is 3020100 ok 1 Read same data Totals: pass:1 fail:0 xfail:0 xpass:0 skip:0 error:0 [PASS] ok 1 hugepage-mremap After patch: running ./hugepage-mremap ------------------------- TAP version 13 1..1 Map haddr: Returned address is 0x7eaa40000000 Map daddr: Returned address is 0x7daa40000000 Map vaddr: Returned address is 0x7faa40000000 Registered memory at address 0x7eaa40000000 with userfaultfd Mremap: Returned address is 0x7faa40000000 First hex is 0 First hex is 3020100 ok 1 Read same data Totals: pass:1 fail:0 xfail:0 xpass:0 skip:0 error:0 [PASS] ok 1 hugepage-mremap Fixes: 12b613206474 ("mm, hugepages: add hugetlb vma mremap() test") Acked-by: David Hildenbrand (Arm) Tested-by: Venkat Rao Bagalkote Signed-off-by: Sayali Patil --- tools/testing/selftests/mm/hugepage-mremap.c | 21 +++++--------------- 1 file changed, 5 insertions(+), 16 deletions(-) diff --git a/tools/testing/selftests/mm/hugepage-mremap.c b/tools/testing/selftests/mm/hugepage-mremap.c index f66e4d806477..68c35d1d8a5f 100644 --- a/tools/testing/selftests/mm/hugepage-mremap.c +++ b/tools/testing/selftests/mm/hugepage-mremap.c @@ -86,25 +86,14 @@ static void register_region_with_uffd(char *addr, size_t len) if (ioctl(uffd, UFFDIO_API, &uffdio_api) == -1) ksft_exit_fail_msg("ioctl-UFFDIO_API: %s\n", strerror(errno)); - /* Create a private anonymous mapping. The memory will be - * demand-zero paged--that is, not yet allocated. When we - * actually touch the memory, it will be allocated via - * the userfaultfd. - */ - - addr = mmap(NULL, len, PROT_READ | PROT_WRITE, - MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); - if (addr == MAP_FAILED) - ksft_exit_fail_msg("mmap: %s\n", strerror(errno)); - - ksft_print_msg("Address returned by mmap() = %p\n", addr); - - /* Register the memory range of the mapping we just created for - * handling by the userfaultfd object. In mode, we request to track - * missing pages (i.e., pages that have not yet been faulted in). + /* Register the passed memory range for handling by the userfaultfd object. + * In mode, we request to track missing pages + * (i.e., pages that have not yet been faulted in). */ if (uffd_register(uffd, addr, len, true, false, false)) ksft_exit_fail_msg("ioctl-UFFDIO_REGISTER: %s\n", strerror(errno)); + + ksft_print_msg("Registered memory at address %p with userfaultfd\n", addr); } int main(int argc, char *argv[]) -- 2.52.0