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GET /api/patches/2216785/?format=api
{ "id": 2216785, "url": "http://patchwork.ozlabs.org/api/patches/2216785/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/b3a1760e4583340e767d4045b90784ee41c8773e.1774591179.git.sayalip@linux.ibm.com/", "project": { "id": 2, "url": "http://patchwork.ozlabs.org/api/projects/2/?format=api", "name": "Linux PPC development", "link_name": "linuxppc-dev", "list_id": "linuxppc-dev.lists.ozlabs.org", "list_email": "linuxppc-dev@lists.ozlabs.org", "web_url": "https://github.com/linuxppc/wiki/wiki", "scm_url": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git", "webscm_url": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/", "list_archive_url": "https://lore.kernel.org/linuxppc-dev/", "list_archive_url_format": "https://lore.kernel.org/linuxppc-dev/{}/", "commit_url_format": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?id={}" }, "msgid": "<b3a1760e4583340e767d4045b90784ee41c8773e.1774591179.git.sayalip@linux.ibm.com>", "list_archive_url": "https://lore.kernel.org/linuxppc-dev/b3a1760e4583340e767d4045b90784ee41c8773e.1774591179.git.sayalip@linux.ibm.com/", "date": "2026-03-27T07:16:01", "name": "[v3,07/13] selftest/mm: register existing mapping with userfaultfd in hugepage-mremap", "commit_ref": null, "pull_url": null, "state": "handled-elsewhere", "archived": false, "hash": "dc858f369600208a1d82a1ef3abf888c0d7b0265", "submitter": { "id": 92656, "url": "http://patchwork.ozlabs.org/api/people/92656/?format=api", "name": "Sayali Patil", "email": "sayalip@linux.ibm.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/b3a1760e4583340e767d4045b90784ee41c8773e.1774591179.git.sayalip@linux.ibm.com/mbox/", "series": [ { "id": 497700, "url": "http://patchwork.ozlabs.org/api/series/497700/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=497700", "date": "2026-03-27T07:15:54", "name": "selftests/mm: fix failures and robustness improvements", "version": 3, "mbox": "http://patchwork.ozlabs.org/series/497700/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2216785/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2216785/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <linuxppc-dev+bounces-18909-incoming=patchwork.ozlabs.org@lists.ozlabs.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "linuxppc-dev@lists.ozlabs.org" ], "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=ibm.com header.i=@ibm.com header.a=rsa-sha256\n header.s=pp1 header.b=tVU1eHce;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org\n (client-ip=2404:9400:21b9:f100::1; helo=lists.ozlabs.org;\n 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bh=kvSwsyZV69210VfD5\n\tD6z5SjcmWJKFD/pQTO5CUFcjLA=; b=tVU1eHceyLRQIBEdrfDYvfJrkEFvg00n/\n\tQtHlsPk1q7iFQh5hFjJ6pdUryI/WeGMpz1wf9E5qDaxsg2tEE6RDtO+MSnI4eb4X\n\tIkiJXmtpBaksfUtrj1AeqbSfaHie6Um+fQBg+ZP8HD1AZ9QSvSPxTg7xtsEBVFY8\n\tsWWHCPNOvjNsJNTIiocx8iyC5ZQGCxBfrPNK34XYU6f9z9zTMxGzTd2Hnp14t4eU\n\tdMXqgHnU211OnFWVIK++dVI76EOwujW9nUFgwnHo/KqhWwM+gCIdUDv8cjQM9fsQ\n\t5ZaImWKkNyc6yxy6jYoTU5BghEe2EAJXNrr91y62Rkdadvh8Ugebw==", "From": "Sayali Patil <sayalip@linux.ibm.com>", "To": "Andrew Morton <akpm@linux-foundation.org>, Shuah Khan <shuah@kernel.org>,\n linux-mm@kvack.org, linux-kernel@vger.kernel.org,\n linux-kselftest@vger.kernel.org,\n Ritesh Harjani <ritesh.list@gmail.com>", "Cc": "David Hildenbrand <david@kernel.org>, Zi Yan <ziy@nvidia.com>,\n Michal Hocko <mhocko@kernel.org>, Oscar Salvador <osalvador@suse.de>,\n Lorenzo Stoakes <lorenzo.stoakes@oracle.com>,\n Dev Jain <dev.jain@arm.com>, Liam.Howlett@oracle.com,\n linuxppc-dev@lists.ozlabs.org, Sayali Patil <sayalip@linux.ibm.com>,\n Venkat Rao Bagalkote <venkat88@linux.ibm.com>", "Subject": "[PATCH v3 07/13] selftest/mm: register existing mapping with\n userfaultfd in hugepage-mremap", "Date": "Fri, 27 Mar 2026 12:46:01 +0530", "Message-ID": "\n <b3a1760e4583340e767d4045b90784ee41c8773e.1774591179.git.sayalip@linux.ibm.com>", "X-Mailer": "git-send-email 2.52.0", "In-Reply-To": "<cover.1774591179.git.sayalip@linux.ibm.com>", "References": "<cover.1774591179.git.sayalip@linux.ibm.com>", "X-Mailing-List": "linuxppc-dev@lists.ozlabs.org", "List-Id": "<linuxppc-dev.lists.ozlabs.org>", "List-Help": "<mailto:linuxppc-dev+help@lists.ozlabs.org>", "List-Owner": "<mailto:linuxppc-dev+owner@lists.ozlabs.org>", "List-Post": "<mailto:linuxppc-dev@lists.ozlabs.org>", "List-Archive": "<https://lore.kernel.org/linuxppc-dev/>,\n <https://lists.ozlabs.org/pipermail/linuxppc-dev/>", "List-Subscribe": "<mailto:linuxppc-dev+subscribe@lists.ozlabs.org>,\n <mailto:linuxppc-dev+subscribe-digest@lists.ozlabs.org>,\n <mailto:linuxppc-dev+subscribe-nomail@lists.ozlabs.org>", "List-Unsubscribe": "<mailto:linuxppc-dev+unsubscribe@lists.ozlabs.org>", "Precedence": "list", "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\n /saUCpfsKs7W7mk5N9aN+b87pTZSvNDm13ecjtz1LVkEP+Az1h7rBAkMir94QlVaS/HvL1zzlhB\n ulyMdhaFWMSUUPtBzH6Z7ilIbJp3eOwC1bsXeR4d4jPDjBosx7GCAYOjF77nrugQG3YxuFVtgHb\n tyHj9fWpjCYFXet/oqx9hI0+So1pquz9MyWV50if+AqXB2joHpqL0AgbKhpUgbHArkI1Huk0i7S\n bZnyLlfvagvKz0s1rJfTwVyLrWAUZNn52qJJeUywgUTxVywseQ48bVprqw7fGLqCzj/uv8huGbT\n ar0eEXZDrs8/bT9//C28BTxTU2v0/GB65RncN2S0r4SvQ4Uhepxj1K4sLS3k2C5CrOq+t2h18J7\n E9wu2gRQSsJx9mfjko99U6Rk9KPrcchUS/O6nBNwvWfy6xRCd19al1hxltR/lCfBulIVe0fZApk\n 7JLqjphAHeO8QTYtNqg==", "X-Authority-Analysis": "v=2.4 cv=JK42csKb c=1 sm=1 tr=0 ts=69c62f1b cx=c_pps\n a=bLidbwmWQ0KltjZqbj+ezA==:117 a=bLidbwmWQ0KltjZqbj+ezA==:17\n a=Yq5XynenixoA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22\n 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\n engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49\n definitions=2026-03-26_04,2026-03-26_01,2025-10-01_01", "X-Proofpoint-Spam-Details": "rule=outbound_notspam policy=outbound score=0\n impostorscore=0 clxscore=1015 priorityscore=1501 malwarescore=0 adultscore=0\n spamscore=0 suspectscore=0 phishscore=0 lowpriorityscore=0 bulkscore=0\n classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0\n reason=mlx scancount=1 engine=8.22.0-2603050001 definitions=main-2603270053", "X-Spam-Status": "No, score=-0.7 required=3.0 tests=DKIM_SIGNED,DKIM_VALID,\n\tRCVD_IN_DNSWL_LOW,RCVD_IN_MSPIKE_H4,RCVD_IN_MSPIKE_WL,SPF_HELO_NONE,\n\tSPF_PASS autolearn=disabled version=4.0.1 OzLabs 8", "X-Spam-Checker-Version": "SpamAssassin 4.0.1 (2024-03-25) on lists.ozlabs.org" }, "content": "Previously, register_region_with_uffd() created a new anonymous\nmapping and overwrote the address supplied by the caller before\nregistering the range with userfaultfd.\n\nAs a result, userfaultfd was applied to an unrelated anonymous mapping\ninstead of the hugetlb region used by the test.\n\nRemove the extra mmap() and register the caller-provided address range\ndirectly using UFFDIO_REGISTER_MODE_MISSING, so that faults are\ngenerated for the hugetlb mapping used by the test.\n\nThis ensures userfaultfd operates on the actual hugetlb test region and\nvalidates the expected fault handling.\n\nBefore patch:\n running ./hugepage-mremap\n -------------------------\n TAP version 13\n 1..1\n Map haddr: Returned address is 0x7eaa40000000\n Map daddr: Returned address is 0x7daa40000000\n Map vaddr: Returned address is 0x7faa40000000\n Address returned by mmap() = 0x7fff9d000000\n Mremap: Returned address is 0x7faa40000000\n First hex is 0\n First hex is 3020100\n ok 1 Read same data\n Totals: pass:1 fail:0 xfail:0 xpass:0 skip:0 error:0\n [PASS]\n ok 1 hugepage-mremap\n\nAfter patch:\n running ./hugepage-mremap\n -------------------------\n TAP version 13\n 1..1\n Map haddr: Returned address is 0x7eaa40000000\n Map daddr: Returned address is 0x7daa40000000\n Map vaddr: Returned address is 0x7faa40000000\n Registered memory at address 0x7eaa40000000 with userfaultfd\n Mremap: Returned address is 0x7faa40000000\n First hex is 0\n First hex is 3020100\n ok 1 Read same data\n Totals: pass:1 fail:0 xfail:0 xpass:0 skip:0 error:0\n [PASS]\n ok 1 hugepage-mremap\n\nFixes: 12b613206474 (\"mm, hugepages: add hugetlb vma mremap() test\")\nTested-by: Venkat Rao Bagalkote <venkat88@linux.ibm.com>\nSigned-off-by: Sayali Patil <sayalip@linux.ibm.com>\n---\n tools/testing/selftests/mm/hugepage-mremap.c | 21 +++++---------------\n 1 file changed, 5 insertions(+), 16 deletions(-)", "diff": "diff --git a/tools/testing/selftests/mm/hugepage-mremap.c b/tools/testing/selftests/mm/hugepage-mremap.c\nindex b8f7d92e5a35..e611249080d6 100644\n--- a/tools/testing/selftests/mm/hugepage-mremap.c\n+++ b/tools/testing/selftests/mm/hugepage-mremap.c\n@@ -85,25 +85,14 @@ static void register_region_with_uffd(char *addr, size_t len)\n \tif (ioctl(uffd, UFFDIO_API, &uffdio_api) == -1)\n \t\tksft_exit_fail_msg(\"ioctl-UFFDIO_API: %s\\n\", strerror(errno));\n \n-\t/* Create a private anonymous mapping. The memory will be\n-\t * demand-zero paged--that is, not yet allocated. When we\n-\t * actually touch the memory, it will be allocated via\n-\t * the userfaultfd.\n-\t */\n-\n-\taddr = mmap(NULL, len, PROT_READ | PROT_WRITE,\n-\t\t MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);\n-\tif (addr == MAP_FAILED)\n-\t\tksft_exit_fail_msg(\"mmap: %s\\n\", strerror(errno));\n-\n-\tksft_print_msg(\"Address returned by mmap() = %p\\n\", addr);\n-\n-\t/* Register the memory range of the mapping we just created for\n-\t * handling by the userfaultfd object. In mode, we request to track\n-\t * missing pages (i.e., pages that have not yet been faulted in).\n+\t/* Register the passed memory range for handling by the userfaultfd object.\n+\t * In mode, we request to track missing pages\n+\t * (i.e., pages that have not yet been faulted in).\n \t */\n \tif (uffd_register(uffd, addr, len, true, false, false))\n \t\tksft_exit_fail_msg(\"ioctl-UFFDIO_REGISTER: %s\\n\", strerror(errno));\n+\n+\tksft_print_msg(\"Registered memory at address %p with userfaultfd\\n\", addr);\n }\n \n int main(int argc, char *argv[])\n", "prefixes": [ "v3", "07/13" ] }