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GET /api/1.1/patches/2227630/?format=api
{ "id": 2227630, "url": "http://patchwork.ozlabs.org/api/1.1/patches/2227630/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260424025547.3806072-8-songmuchun@bytedance.com/", "project": { "id": 2, "url": "http://patchwork.ozlabs.org/api/1.1/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/" }, "msgid": "<20260424025547.3806072-8-songmuchun@bytedance.com>", "date": "2026-04-24T02:55:47", "name": "[v6,7/7] mm/memory_hotplug: Factor out altmap freeing checks", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "b6dd86ae6922c9269638d2c896961465ae124f3c", "submitter": { "id": 78930, "url": "http://patchwork.ozlabs.org/api/1.1/people/78930/?format=api", "name": "Muchun Song", "email": "songmuchun@bytedance.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260424025547.3806072-8-songmuchun@bytedance.com/mbox/", "series": [ { "id": 501285, "url": "http://patchwork.ozlabs.org/api/1.1/series/501285/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=501285", "date": "2026-04-24T02:55:40", "name": "mm: fix vmemmap optimization accounting and initialization", "version": 6, "mbox": "http://patchwork.ozlabs.org/series/501285/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2227630/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2227630/checks/", "tags": {}, "headers": { "Return-Path": "\n <linuxppc-dev+bounces-20033-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=bytedance.com header.i=@bytedance.com\n header.a=rsa-sha256 header.s=google header.b=U0ge4YEf;\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; 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Howlett\" <Liam.Howlett@oracle.com>,\n\tVlastimil Babka <vbabka@kernel.org>,\n\tMike Rapoport <rppt@kernel.org>,\n\tSuren Baghdasaryan <surenb@google.com>,\n\tMichal Hocko <mhocko@suse.com>,\n\tNicholas Piggin <npiggin@gmail.com>,\n\tChristophe Leroy <chleroy@kernel.org>,\n\taneesh.kumar@linux.ibm.com,\n\tjoao.m.martins@oracle.com,\n\tlinux-mm@kvack.org,\n\tlinuxppc-dev@lists.ozlabs.org,\n\tlinux-kernel@vger.kernel.org,\n\tMuchun Song <songmuchun@bytedance.com>", "Subject": "[PATCH v6 7/7] mm/memory_hotplug: Factor out altmap freeing checks", "Date": "Fri, 24 Apr 2026 10:55:47 +0800", "Message-Id": "<20260424025547.3806072-8-songmuchun@bytedance.com>", "X-Mailer": "git-send-email 2.20.1", "In-Reply-To": "<20260424025547.3806072-1-songmuchun@bytedance.com>", "References": "<20260424025547.3806072-1-songmuchun@bytedance.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-Spam-Status": "No, score=-0.2 required=3.0 tests=DKIM_SIGNED,DKIM_VALID,\n\tDKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS\n\tautolearn=disabled version=4.0.1 OzLabs 8", "X-Spam-Checker-Version": "SpamAssassin 4.0.1 (2024-03-25) on lists.ozlabs.org" }, "content": "Use a small helper to centralize altmap freeing after verifying that all\nvmemmap pages were released. This keeps the check consistent between the\nnormal teardown path and the memory hotplug error paths.\n\nSuggested-by: David Hildenbrand (Arm) <david@kernel.org>\nSigned-off-by: Muchun Song <songmuchun@bytedance.com>\n---\n mm/memory_hotplug.c | 16 +++++++++-------\n 1 file changed, 9 insertions(+), 7 deletions(-)", "diff": "diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c\nindex 7bfdc3a99688..ee150d312bd9 100644\n--- a/mm/memory_hotplug.c\n+++ b/mm/memory_hotplug.c\n@@ -1403,6 +1403,12 @@ bool mhp_supports_memmap_on_memory(void)\n }\n EXPORT_SYMBOL_GPL(mhp_supports_memmap_on_memory);\n \n+static void altmap_free(struct vmem_altmap *altmap)\n+{\n+\tWARN_ONCE(altmap->alloc, \"Altmap not fully unmapped\");\n+\tkfree(altmap);\n+}\n+\n static void remove_memory_blocks_and_altmaps(u64 start, u64 size)\n {\n \tunsigned long memblock_size = memory_block_size_bytes();\n@@ -1425,12 +1431,8 @@ static void remove_memory_blocks_and_altmaps(u64 start, u64 size)\n \t\tmem->altmap = NULL;\n \n \t\tremove_memory_block_devices(cur_start, memblock_size);\n-\n \t\tarch_remove_memory(cur_start, memblock_size, altmap, NULL);\n-\n-\t\t/* Verify that all vmemmap pages have actually been freed. */\n-\t\tWARN(altmap->alloc, \"Altmap not fully unmapped\");\n-\t\tkfree(altmap);\n+\t\taltmap_free(altmap);\n \t}\n }\n \n@@ -1461,7 +1463,7 @@ static int create_altmaps_and_memory_blocks(int nid, struct memory_group *group,\n \t\t/* call arch's memory hotadd */\n \t\tret = arch_add_memory(nid, cur_start, memblock_size, ¶ms);\n \t\tif (ret < 0) {\n-\t\t\tkfree(params.altmap);\n+\t\t\taltmap_free(params.altmap);\n \t\t\tgoto out;\n \t\t}\n \n@@ -1470,7 +1472,7 @@ static int create_altmaps_and_memory_blocks(int nid, struct memory_group *group,\n \t\t\t\t\t\t params.altmap, group);\n \t\tif (ret) {\n \t\t\tarch_remove_memory(cur_start, memblock_size, params.altmap, NULL);\n-\t\t\tkfree(params.altmap);\n+\t\t\taltmap_free(params.altmap);\n \t\t\tgoto out;\n \t\t}\n \t}\n", "prefixes": [ "v6", "7/7" ] }