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GET /api/1.1/patches/2227628/?format=api
{ "id": 2227628, "url": "http://patchwork.ozlabs.org/api/1.1/patches/2227628/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260424025547.3806072-6-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": "<20260424025547.3806072-6-songmuchun@bytedance.com>", "date": "2026-04-24T02:55:45", "name": "[v6,5/7] mm/mm_init: Fix pageblock migratetype for ZONE_DEVICE compound pages", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "b6e308e63fb4e7c6d4568c035db57fd62573b213", "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/20260424025547.3806072-6-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/2227628/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2227628/checks/", "tags": {}, "headers": { "Return-Path": "\n <linuxppc-dev+bounces-20031-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=UAC1THZl;\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>,\n\tstable@vger.kernel.org", "Subject": "[PATCH v6 5/7] mm/mm_init: Fix pageblock migratetype for ZONE_DEVICE\n compound pages", "Date": "Fri, 24 Apr 2026 10:55:45 +0800", "Message-Id": "<20260424025547.3806072-6-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": "The memmap_init_zone_device() function only initializes the migratetype\nof the first pageblock of a compound page. If the compound page size\nexceeds pageblock_nr_pages (e.g., 1GB hugepages with 2MB pageblocks),\nsubsequent pageblocks in the compound page remain uninitialized.\n\nMove the migratetype initialization out of __init_zone_device_page()\nand into a separate pageblock_migratetype_init_range() function. This\niterates over the entire PFN range of the memory, ensuring that all\npageblocks are correctly initialized.\n\nAlso remove the stale confusing comment about MEMINIT_HOTPLUG above\nthe migratetype setting since it is an obsolete relic from commit\n966cf44f637e (\"mm: defer ZONE_DEVICE page initialization to the point\nwhere we init pgmap\") and no longer makes sense here.\n\nFixes: c4386bd8ee3a (\"mm/memremap: add ZONE_DEVICE support for compound pages\")\nCc: stable@vger.kernel.org\nSigned-off-by: Muchun Song <songmuchun@bytedance.com>\nReviewed-by: Mike Rapoport (Microsoft) <rppt@kernel.org>\nReviewed-by: Oscar Salvador <osalvador@suse.de>\nAcked-by: David Hildenbrand (Arm) <david@kernel.org>\n---\n mm/mm_init.c | 34 +++++++++++++++++++---------------\n 1 file changed, 19 insertions(+), 15 deletions(-)", "diff": "diff --git a/mm/mm_init.c b/mm/mm_init.c\nindex f9f8e1af921c..cfc76953e249 100644\n--- a/mm/mm_init.c\n+++ b/mm/mm_init.c\n@@ -674,6 +674,20 @@ static inline void fixup_hashdist(void)\n static inline void fixup_hashdist(void) {}\n #endif /* CONFIG_NUMA */\n \n+#ifdef CONFIG_ZONE_DEVICE\n+static __meminit void pageblock_migratetype_init_range(unsigned long pfn,\n+\t\tunsigned long nr_pages, int migratetype)\n+{\n+\tconst unsigned long end = pfn + nr_pages;\n+\n+\tfor (pfn = pageblock_align(pfn); pfn < end; pfn += pageblock_nr_pages) {\n+\t\tinit_pageblock_migratetype(pfn_to_page(pfn), migratetype, false);\n+\t\tif (IS_ALIGNED(pfn, PAGES_PER_SECTION))\n+\t\t\tcond_resched();\n+\t}\n+}\n+#endif\n+\n /*\n * Initialize a reserved page unconditionally, finding its zone first.\n */\n@@ -1011,21 +1025,6 @@ static void __ref __init_zone_device_page(struct page *page, unsigned long pfn,\n \tpage_folio(page)->pgmap = pgmap;\n \tpage->zone_device_data = NULL;\n \n-\t/*\n-\t * Mark the block movable so that blocks are reserved for\n-\t * movable at startup. This will force kernel allocations\n-\t * to reserve their blocks rather than leaking throughout\n-\t * the address space during boot when many long-lived\n-\t * kernel allocations are made.\n-\t *\n-\t * Please note that MEMINIT_HOTPLUG path doesn't clear memmap\n-\t * because this is done early in section_activate()\n-\t */\n-\tif (pageblock_aligned(pfn)) {\n-\t\tinit_pageblock_migratetype(page, MIGRATE_MOVABLE, false);\n-\t\tcond_resched();\n-\t}\n-\n \t/*\n \t * ZONE_DEVICE pages other than MEMORY_TYPE_GENERIC are released\n \t * directly to the driver page allocator which will set the page count\n@@ -1122,6 +1121,9 @@ void __ref memmap_init_zone_device(struct zone *zone,\n \n \t\t__init_zone_device_page(page, pfn, zone_idx, nid, pgmap);\n \n+\t\tif (IS_ALIGNED(pfn, PAGES_PER_SECTION))\n+\t\t\tcond_resched();\n+\n \t\tif (pfns_per_compound == 1)\n \t\t\tcontinue;\n \n@@ -1129,6 +1131,8 @@ void __ref memmap_init_zone_device(struct zone *zone,\n \t\t\t\t compound_nr_pages(altmap, pgmap));\n \t}\n \n+\tpageblock_migratetype_init_range(start_pfn, nr_pages, MIGRATE_MOVABLE);\n+\n \tpr_debug(\"%s initialised %lu pages in %ums\\n\", __func__,\n \t\tnr_pages, jiffies_to_msecs(jiffies - start));\n }\n", "prefixes": [ "v6", "5/7" ] }