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GET /api/1.2/patches/2232284/?format=api
{ "id": 2232284, "url": "http://patchwork.ozlabs.org/api/1.2/patches/2232284/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/d44a6928ec374ad740e1f2b73ff059b2b680ff3b.1777877814.git.sayalip@linux.ibm.com/", "project": { "id": 2, "url": "http://patchwork.ozlabs.org/api/1.2/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": "<d44a6928ec374ad740e1f2b73ff059b2b680ff3b.1777877814.git.sayalip@linux.ibm.com>", "list_archive_url": "https://lore.kernel.org/linuxppc-dev/d44a6928ec374ad740e1f2b73ff059b2b680ff3b.1777877814.git.sayalip@linux.ibm.com/", "date": "2026-05-04T08:24:46", "name": "[v6,09/14] selftest/mm: register existing mapping with userfaultfd in hugepage-mremap", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "dc858f369600208a1d82a1ef3abf888c0d7b0265", "submitter": { "id": 92656, "url": "http://patchwork.ozlabs.org/api/1.2/people/92656/?format=api", "name": "Sayali Patil", "email": "sayalip@linux.ibm.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/d44a6928ec374ad740e1f2b73ff059b2b680ff3b.1777877814.git.sayalip@linux.ibm.com/mbox/", "series": [ { "id": 502625, "url": "http://patchwork.ozlabs.org/api/1.2/series/502625/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=502625", "date": "2026-05-04T08:24:37", "name": "selftests/mm: fix failures and robustness improvements", "version": 6, "mbox": "http://patchwork.ozlabs.org/series/502625/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2232284/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2232284/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <linuxppc-dev+bounces-20407-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=PdTov3oS;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org\n (client-ip=112.213.38.117; helo=lists.ozlabs.org;\n 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bh=moIJIypDjtmZnGtHA\n\tK76laQuaSh8Y71cRRNVJavHh8k=; b=PdTov3oSiXlEpY/JsU5ShLROWVd8FlVNT\n\tJXzIb8pHtJ1jTIuivkx8AED+4DEfEXdxf+rkIxL9HpGOATFy8f8eACteugmZSELS\n\tZ67i4ZxdQch7M/cpM2Qep2PUv7C+tbeEMR6SEuZrNrN48rN5udlg9B4QLgCJoQVJ\n\tIzIGI+3pBjAi9+Mtk/7y6WjlfmRW0aj/TXzJ22z43yes8xj6wUkc1j7oZQ8QElLp\n\tV9wnnhl3xddZX8KfFP3WGW7BTP6sB3YVXTC4NbMmV4S4KGFZgq/6CLdHUZHPtM89\n\tgSPBhPBjnzk2kFWCnhxfAQ2knAucNW/OG2iwIR0GbD1yRntFgdabQ==", "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, Miaohe Lin <linmiaohe@huawei.com>,\n Venkat Rao Bagalkote <venkat88@linux.ibm.com>,\n Sayali Patil <sayalip@linux.ibm.com>", "Subject": "[PATCH v6 09/14] selftest/mm: register existing mapping with\n userfaultfd in hugepage-mremap", "Date": "Mon, 4 May 2026 13:54:46 +0530", "Message-ID": "\n <d44a6928ec374ad740e1f2b73ff059b2b680ff3b.1777877814.git.sayalip@linux.ibm.com>", "X-Mailer": "git-send-email 2.52.0", "In-Reply-To": "<cover.1777877814.git.sayalip@linux.ibm.com>", "References": "<cover.1777877814.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 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"wfQhWfwlxQb2Uk9D0i_52QNHqRi6jSjT", "X-Authority-Analysis": "v=2.4 cv=W7UIkxWk c=1 sm=1 tr=0 ts=69f85805 cx=c_pps\n a=5BHTudwdYE3Te8bg5FgnPg==:117 a=5BHTudwdYE3Te8bg5FgnPg==:17\n a=NGcC8JguVDcA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22\n a=uAbxVGIbfxUO_5tXvNgY:22 a=VwQbUJbxAAAA:8 a=VnNF1IyMAAAA:8\n a=gVE5Qc0x_BWLnb-D2gsA:9", "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=2026-05-04_03,2026-04-30_02,2025-10-01_01", "X-Proofpoint-Spam-Details": "rule=outbound_notspam policy=outbound score=0\n priorityscore=1501 adultscore=0 lowpriorityscore=0 malwarescore=0\n suspectscore=0 spamscore=0 clxscore=1015 phishscore=0 bulkscore=0\n impostorscore=0 classifier=typeunknown authscore=0 authtc= authcc=\n route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604200000\n definitions=main-2605040087", "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\")\nAcked-by: David Hildenbrand (Arm) <david@kernel.org>\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 f66e4d806477..68c35d1d8a5f 100644\n--- a/tools/testing/selftests/mm/hugepage-mremap.c\n+++ b/tools/testing/selftests/mm/hugepage-mremap.c\n@@ -86,25 +86,14 @@ 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": [ "v6", "09/14" ] }