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Mon, 6 Apr 2026 09:20:13 +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 v4 09/15] selftest/mm: register existing mapping with userfaultfd in hugepage-mremap Date: Mon, 6 Apr 2026 14:49:28 +0530 Message-ID: <37b8bdb379a845beaba645c104fb0cc31aca57ac.1775466330.git.sayalip@linux.ibm.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Authority-Analysis: v=2.4 cv=J6anLQnS c=1 sm=1 tr=0 ts=69d37ad6 cx=c_pps a=5BHTudwdYE3Te8bg5FgnPg==:117 a=5BHTudwdYE3Te8bg5FgnPg==:17 a=A5OVakUREuEA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=iQ6ETzBq9ecOQQE5vZCe:22 a=VwQbUJbxAAAA:8 a=VnNF1IyMAAAA:8 a=gVE5Qc0x_BWLnb-D2gsA:9 X-Proofpoint-GUID: bDkKYtSL7-5YYatGT3uYr5GJCOCbfYCm X-Proofpoint-ORIG-GUID: yy50-zknC1XxWo7EBfMRsAKwxbNehDuS X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDA2MDA5MCBTYWx0ZWRfX0L9bzyHv8hJP thTEypg2qYrg7xhCXBzT5XOAaxsNXhnCI4mVYAvtMI3moASSrlVx/OoCY5qMe48PeM8c0aXZy7D 7eQ6BpelOPag6j0HC0/nzpXqQuMPH39DiIclV6Al7Rb+1D09Fh6PgoWtc6a62H4ZI7gFUdcvvJ3 ZBWL+Y3Y4C6+By59unOg1widV8ZlSeed3DV81mhoqD9gqAKxzlxPujeUuZFbKrw77gSXi4e25b1 ZEGs26p/PGN6770RPDPsgEsS2FWkX0nCV2A5SteF9mqvbiyh4r5vgGKXp8S413gsC0bvaoVZNux DBFOz/AxLL1ONS9VDXI5Rr7/r1kGLswnMa29JS89R0BnSHuuhnDP6FT4VD8tE+3xFGK3j24uAy4 oalUym6pSy0BIdIZ2WlIzmc5/qZFSrX/USH1pzptXTgoDtUesuCV1fZjREgroDuRu8r87a3dW/y zy1CdO3alpdkyVBcIpQ== 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=2026-04-06_02,2026-04-03_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 lowpriorityscore=0 bulkscore=0 priorityscore=1501 clxscore=1015 impostorscore=0 phishscore=0 malwarescore=0 suspectscore=0 adultscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2603050001 definitions=main-2604060090 Content-Type: text/plain; charset="utf-8" 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() =3D 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/s= elftests/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) =3D=3D -1) ksft_exit_fail_msg("ioctl-UFFDIO_API: %s\n", strerror(errno)); =20 - /* 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 =3D mmap(NULL, len, PROT_READ | PROT_WRITE, - MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); - if (addr =3D=3D MAP_FAILED) - ksft_exit_fail_msg("mmap: %s\n", strerror(errno)); - - ksft_print_msg("Address returned by mmap() =3D %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 objec= t. + * 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= ); } =20 int main(int argc, char *argv[]) --=20 2.52.0