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GET /api/patches/2216787/?format=api
{ "id": 2216787, "url": "http://patchwork.ozlabs.org/api/patches/2216787/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/3b6ffba238a4b59de891acf896fa25d7d3193228.1774591179.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": "<3b6ffba238a4b59de891acf896fa25d7d3193228.1774591179.git.sayalip@linux.ibm.com>", "list_archive_url": "https://lore.kernel.org/linuxppc-dev/3b6ffba238a4b59de891acf896fa25d7d3193228.1774591179.git.sayalip@linux.ibm.com/", "date": "2026-03-27T07:16:02", "name": "[v3,08/13] selftests/mm: ensure destination is hugetlb-backed in hugepage-mremap", "commit_ref": null, "pull_url": null, "state": "handled-elsewhere", "archived": false, "hash": "f168e425b0145ff1ddb222bb87ea31ae0a5c35fc", "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/3b6ffba238a4b59de891acf896fa25d7d3193228.1774591179.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/2216787/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2216787/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <linuxppc-dev+bounces-18911-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=Cc4G0gGU;\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=YLh3Xo4k3v9jnrfOx\n\tk2s5YhbXein0Q02MzH6XXPveGU=; b=Cc4G0gGU2bg+qF724WYhOWAJnjhyEWc9K\n\tBOD3UYFRxV2vk34I9C6iEGkgq9ySyzj/ZHU3HwRcf2u2iDq9tPKk0IEO3f2lPZ6F\n\tcP7kxuKVcTxgh5gH/nQTBCGac83KU8SVkLsalqhwW+n9K1I7wF8GL85nEGwPJihd\n\tWDQ3Zzfe3zl3K9iVjSuGFfX8V+FmT5J+NOmTX0womDcFH9OaFOgZsXqPW/Lb6uGY\n\thNbJ7As6jBU/2rWfdKDUQrKWA0Q9byue05R1DjSCFpljySLtw0mPnMG6ocL1czPi\n\tVOdFyvMea9kHIwGwjhZURHwWtoKlGWWxUWF7cMtWeSW8RwpQ1dHdw==", "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 08/13] selftests/mm: ensure destination is hugetlb-backed\n in hugepage-mremap", "Date": "Fri, 27 Mar 2026 12:46:02 +0530", "Message-ID": "\n <3b6ffba238a4b59de891acf896fa25d7d3193228.1774591179.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-Authority-Analysis": "v=2.4 cv=IqITsb/g c=1 sm=1 tr=0 ts=69c62f1f cx=c_pps\n a=AfN7/Ok6k8XGzOShvHwTGQ==:117 a=AfN7/Ok6k8XGzOShvHwTGQ==:17\n a=Yq5XynenixoA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22\n a=uAbxVGIbfxUO_5tXvNgY:22 a=Ikd4Dj_1AAAA:8 a=VnNF1IyMAAAA:8\n a=1nRyTxe7YdkMqT3215IA:9", "X-Proofpoint-Spam-Details-Enc": "AW1haW4tMjYwMzI3MDA1MyBTYWx0ZWRfX/EXoCcJATeIi\n SJh3f9tQ0OWxesW3ZFWqb1En2EOSlYMhFbPOQs3ehYdI1mclLdStSJNNwrOvZtYgBpCKlfLAFwG\n vt6bJJ3e0z9sAyuMEb1xZsiTjRZFHOyTk8BTMMzFPOesCg/POBnXSnu89JUD5vzNR0C0cdK+8Ig\n YL1PDbXtARHqnLM7H6ZBMgkORpa2rZhECgfjxTr88PhqYGotpxPkoO0/rNofGkx7Hz2nnOB5fo1\n SAkNSRKtE/HICvHqFgbFhiKWx0icX4sl8t/jSuhvO18ZCRtRA93Wa9gNJ7eY4XTizt2AIb6Qpjy\n 9irjypUf2FToFuX0PDrwih6ACZatGCbC8spQabKLEb165LVNG62bSGxTjGqMAFoe2QZgHfozFm8\n HI1fjQ3r5lKgsQ18fVyXtprdt4bgXVAjveVwKrnC+uo1NvMuHeAL6ZXEDBnKEpnzqsW0nji0EcV\n 0OHsGsuIEQHRaVl54/g==", "X-Proofpoint-GUID": "GMEoH09uQRJ5KOSvRWe1V8OzqY_11NR5", "X-Proofpoint-ORIG-GUID": "8o4VFoIcaVw4PPgEDSc_mCNYsQ2Bg4aD", "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 malwarescore=0 clxscore=1015 spamscore=0 impostorscore=0 suspectscore=0\n phishscore=0 bulkscore=0 adultscore=0 priorityscore=1501 lowpriorityscore=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": "The hugepage-mremap selftest reserves the destination address using a\nanonymous base-page mapping before calling mremap() with MREMAP_FIXED,\nwhile the source region is hugetlb-backed.\n\nWhen remapping a hugetlb mapping into a base-page VMA may fail with:\n\n mremap: Device or resource busy\n\nThis is observed on powerpc hash MMU systems where slice constraints\nand page size incompatibilities prevent the remap.\n\nEnsure the destination region is created using MAP_HUGETLB so that both\nsource and destination VMAs are hugetlb-backed and compatible. Also add\nMAP_POPULATE to the destination mapping to prefault hugepages,\nmatching the behaviour used for other hugetlb mapping in the test and\nensuring deterministic behaviour.\n\nUpdate the FLAGS macro to include MAP_HUGETLB | MAP_SHARED |\nMAP_POPULATE so that both mappings are hugetlb-backed and compatible.\nAlso use the macro for the mmap() calls to avoid repeating\nthe flag combination.\n\nThis ensures the test reliably exercises hugetlb mremap instead of\nfailing due to VMA type mismatch.\n\nFixes: 12b613206474 (\"mm, hugepages: add hugetlb vma mremap() test\")\nAcked-by: Zi Yan <ziy@nvidia.com>\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 | 11 ++++-------\n 1 file changed, 4 insertions(+), 7 deletions(-)", "diff": "diff --git a/tools/testing/selftests/mm/hugepage-mremap.c b/tools/testing/selftests/mm/hugepage-mremap.c\nindex e611249080d6..48c24a4ba9a7 100644\n--- a/tools/testing/selftests/mm/hugepage-mremap.c\n+++ b/tools/testing/selftests/mm/hugepage-mremap.c\n@@ -31,7 +31,7 @@\n #define MB_TO_BYTES(x) (x * 1024 * 1024)\n \n #define PROTECTION (PROT_READ | PROT_WRITE | PROT_EXEC)\n-#define FLAGS (MAP_SHARED | MAP_ANONYMOUS)\n+#define FLAGS (MAP_HUGETLB | MAP_SHARED | MAP_POPULATE)\n \n static void check_bytes(char *addr)\n {\n@@ -121,23 +121,20 @@ int main(int argc, char *argv[])\n \n \t/* mmap to a PUD aligned address to hopefully trigger pmd sharing. */\n \tunsigned long suggested_addr = 0x7eaa40000000;\n-\tvoid *haddr = mmap((void *)suggested_addr, length, PROTECTION,\n-\t\t\t MAP_HUGETLB | MAP_SHARED | MAP_POPULATE, fd, 0);\n+\tvoid *haddr = mmap((void *)suggested_addr, length, PROTECTION, FLAGS, fd, 0);\n \tksft_print_msg(\"Map haddr: Returned address is %p\\n\", haddr);\n \tif (haddr == MAP_FAILED)\n \t\tksft_exit_fail_msg(\"mmap1: %s\\n\", strerror(errno));\n \n \t/* mmap again to a dummy address to hopefully trigger pmd sharing. */\n \tsuggested_addr = 0x7daa40000000;\n-\tvoid *daddr = mmap((void *)suggested_addr, length, PROTECTION,\n-\t\t\t MAP_HUGETLB | MAP_SHARED | MAP_POPULATE, fd, 0);\n+\tvoid *daddr = mmap((void *)suggested_addr, length, PROTECTION, FLAGS, fd, 0);\n \tksft_print_msg(\"Map daddr: Returned address is %p\\n\", daddr);\n \tif (daddr == MAP_FAILED)\n \t\tksft_exit_fail_msg(\"mmap3: %s\\n\", strerror(errno));\n \n \tsuggested_addr = 0x7faa40000000;\n-\tvoid *vaddr =\n-\t\tmmap((void *)suggested_addr, length, PROTECTION, FLAGS, -1, 0);\n+\tvoid *vaddr = mmap((void *)suggested_addr, length, PROTECTION, FLAGS, fd, 0);\n \tksft_print_msg(\"Map vaddr: Returned address is %p\\n\", vaddr);\n \tif (vaddr == MAP_FAILED)\n \t\tksft_exit_fail_msg(\"mmap2: %s\\n\", strerror(errno));\n", "prefixes": [ "v3", "08/13" ] }