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Fri, 27 Mar 2026 07:17:38 +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 , Venkat Rao Bagalkote Subject: [PATCH v3 07/13] selftest/mm: register existing mapping with userfaultfd in hugepage-mremap Date: Fri, 27 Mar 2026 12:46:01 +0530 Message-ID: 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: AW1haW4tMjYwMzI3MDA1MyBTYWx0ZWRfX9u1XtTDz0RtJ /saUCpfsKs7W7mk5N9aN+b87pTZSvNDm13ecjtz1LVkEP+Az1h7rBAkMir94QlVaS/HvL1zzlhB ulyMdhaFWMSUUPtBzH6Z7ilIbJp3eOwC1bsXeR4d4jPDjBosx7GCAYOjF77nrugQG3YxuFVtgHb tyHj9fWpjCYFXet/oqx9hI0+So1pquz9MyWV50if+AqXB2joHpqL0AgbKhpUgbHArkI1Huk0i7S bZnyLlfvagvKz0s1rJfTwVyLrWAUZNn52qJJeUywgUTxVywseQ48bVprqw7fGLqCzj/uv8huGbT ar0eEXZDrs8/bT9//C28BTxTU2v0/GB65RncN2S0r4SvQ4Uhepxj1K4sLS3k2C5CrOq+t2h18J7 E9wu2gRQSsJx9mfjko99U6Rk9KPrcchUS/O6nBNwvWfy6xRCd19al1hxltR/lCfBulIVe0fZApk 7JLqjphAHeO8QTYtNqg== X-Authority-Analysis: v=2.4 cv=JK42csKb c=1 sm=1 tr=0 ts=69c62f1b cx=c_pps a=bLidbwmWQ0KltjZqbj+ezA==:117 a=bLidbwmWQ0KltjZqbj+ezA==:17 a=Yq5XynenixoA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=V8glGbnc2Ofi9Qvn3v5h:22 a=VnNF1IyMAAAA:8 a=gVE5Qc0x_BWLnb-D2gsA:9 X-Proofpoint-ORIG-GUID: BMMudRGFsuH85Xm8ZG_c2ep1t4brN6U8 X-Proofpoint-GUID: yWI22mCS8ME-p-jVV4eQGUqcWpR8TQff 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: D4AA61A0007 X-Stat-Signature: gre1idixntrn75kkp7uxi5nj7eoaihct X-Rspamd-Server: rspam06 X-HE-Tag: 1774595871-722382 X-HE-Meta: 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 g4MEJGZU wVuOtYxDNCFpHOXEpbMFbzpkuqUTQwisWdXjRj7i9Dt3CgMiWnAa7LmBfRJqyWGp/x9Uv3pPsK7dZ54JRj9O4l8RZyEwCxAsRl5QGBYEqBNvuDeYJQE5jkcCzjTxZ/mW1Xg8Emzy+m9lSOyw3VroKAb7wspqezLemMocl+famSUuuuej0iYuRBGHHXHTJkFaPDyFQhyCRNsFNGptnADl5HmTnY7CrKInnlqEG/ffEo+VjkToARk0yuG6N9XZKVknx9Jst65hlB+venH2IOPbWf2Q7hLE8a3D4ajdoBVMgBtOBF2db1RevSD3ZkDXszPsG3tcUTSwd/LnggnkqyUDea80JyGqh2xg5Y30BZSF9LBiLO34= 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") 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 b8f7d92e5a35..e611249080d6 100644 --- a/tools/testing/selftests/mm/hugepage-mremap.c +++ b/tools/testing/selftests/mm/hugepage-mremap.c @@ -85,25 +85,14 @@ 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