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GET /api/1.2/patches/2219930/?format=api
{ "id": 2219930, "url": "http://patchwork.ozlabs.org/api/1.2/patches/2219930/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260405125240.2558577-6-songmuchun@bytedance.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": "<20260405125240.2558577-6-songmuchun@bytedance.com>", "list_archive_url": "https://lore.kernel.org/linuxppc-dev/20260405125240.2558577-6-songmuchun@bytedance.com/", "date": "2026-04-05T12:51:56", "name": "[05/49] mm/sparse: fix missing architecture-specific page table sync for HVO DAX", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "679111f770aea1c2086ef59729a918ac9c01a479", "submitter": { "id": 78930, "url": "http://patchwork.ozlabs.org/api/1.2/people/78930/?format=api", "name": "Muchun Song", "email": "songmuchun@bytedance.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260405125240.2558577-6-songmuchun@bytedance.com/mbox/", "series": [ { "id": 498783, "url": "http://patchwork.ozlabs.org/api/1.2/series/498783/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=498783", "date": "2026-04-05T12:51:51", "name": "mm: Generalize vmemmap optimization for DAX and HugeTLB", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/498783/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2219930/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2219930/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <linuxppc-dev+bounces-19335-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=lc2jdC6A;\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 05/49] mm/sparse: fix missing architecture-specific page table\n sync for HVO DAX", "Date": "Sun, 5 Apr 2026 20:51:56 +0800", "Message-Id": "<20260405125240.2558577-6-songmuchun@bytedance.com>", "X-Mailer": "git-send-email 2.20.1", "In-Reply-To": "<20260405125240.2558577-1-songmuchun@bytedance.com>", "References": "<20260405125240.2558577-1-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": "On x86-64, vmemmap_populate() normally calls sync_global_pgds() to\nkeep the page tables in sync; however, when DAX HVO is enabled,\nvmemmap_populate_compound_pages() skips this architecture-specific\nstep, so omitting the sync on x86-64 can later trigger vmemmap-access\nfaults.\n\nFix this by delegating the HVO DAX decision to the architecture:\n\n- Architectures that do not use the generic vmemmap_populate_basepages()\n or vmemmap_populate_hugepages() paths (e.g. powerpc) can implement\n HVO DAX directly in their own vmemmap_populate().\n\n- Architectures that rely on the generic helpers implicitly inherit\n the correct operation logic and therefore enable HVO DAX safely\n without extra work in generic vmemmap_populate_basepages() or\n vmemmap_populate_hugepages().\n\nThis prevents the x86-64 sync issue.\n\nFixes: 4917f55b4ef9 (\"mm/sparse-vmemmap: improve memory savings for compound devmaps\")\nSigned-off-by: Muchun Song <songmuchun@bytedance.com>\n---\n arch/powerpc/include/asm/book3s/64/radix.h | 6 ------\n arch/powerpc/mm/book3s64/radix_pgtable.c | 15 +++++++++-----\n mm/sparse-vmemmap.c | 24 +++++++++++-----------\n 3 files changed, 22 insertions(+), 23 deletions(-)", "diff": "diff --git a/arch/powerpc/include/asm/book3s/64/radix.h b/arch/powerpc/include/asm/book3s/64/radix.h\nindex bde07c6f900f..2600defa2dc2 100644\n--- a/arch/powerpc/include/asm/book3s/64/radix.h\n+++ b/arch/powerpc/include/asm/book3s/64/radix.h\n@@ -357,11 +357,5 @@ int radix__remove_section_mapping(unsigned long start, unsigned long end);\n #define vmemmap_can_optimize vmemmap_can_optimize\n bool vmemmap_can_optimize(struct vmem_altmap *altmap, struct dev_pagemap *pgmap);\n #endif\n-\n-#define vmemmap_populate_compound_pages vmemmap_populate_compound_pages\n-int __meminit vmemmap_populate_compound_pages(unsigned long start_pfn,\n-\t\t\t\t\t unsigned long start,\n-\t\t\t\t\t unsigned long end, int node,\n-\t\t\t\t\t struct dev_pagemap *pgmap);\n #endif /* __ASSEMBLER__ */\n #endif\ndiff --git a/arch/powerpc/mm/book3s64/radix_pgtable.c b/arch/powerpc/mm/book3s64/radix_pgtable.c\nindex 568500343e5f..dfa2f7dc7e15 100644\n--- a/arch/powerpc/mm/book3s64/radix_pgtable.c\n+++ b/arch/powerpc/mm/book3s64/radix_pgtable.c\n@@ -1109,7 +1109,10 @@ static inline pte_t *vmemmap_pte_alloc(pmd_t *pmdp, int node,\n \treturn pte_offset_kernel(pmdp, address);\n }\n \n-\n+static int __meminit vmemmap_populate_compound_pages(unsigned long start_pfn,\n+\t\t\t\t\t\t unsigned long start,\n+\t\t\t\t\t\t unsigned long end, int node,\n+\t\t\t\t\t\t struct dev_pagemap *pgmap);\n \n int __meminit radix__vmemmap_populate(unsigned long start, unsigned long end, int node,\n \t\t\t\t struct vmem_altmap *altmap, struct dev_pagemap *pgmap)\n@@ -1122,6 +1125,8 @@ int __meminit radix__vmemmap_populate(unsigned long start, unsigned long end, in\n \tpmd_t *pmd;\n \tpte_t *pte;\n \n+\tif (vmemmap_can_optimize(altmap, pgmap))\n+\t\treturn vmemmap_populate_compound_pages(page_to_pfn((struct page *)start), start, end, node, pgmap);\n \t/*\n \t * If altmap is present, Make sure we align the start vmemmap addr\n \t * to PAGE_SIZE so that we calculate the correct start_pfn in\n@@ -1303,10 +1308,10 @@ static pte_t * __meminit vmemmap_compound_tail_page(unsigned long addr,\n \treturn pte;\n }\n \n-int __meminit vmemmap_populate_compound_pages(unsigned long start_pfn,\n-\t\t\t\t\t unsigned long start,\n-\t\t\t\t\t unsigned long end, int node,\n-\t\t\t\t\t struct dev_pagemap *pgmap)\n+static int __meminit vmemmap_populate_compound_pages(unsigned long start_pfn,\n+\t\t\t\t\t\t unsigned long start,\n+\t\t\t\t\t\t unsigned long end, int node,\n+\t\t\t\t\t\t struct dev_pagemap *pgmap)\n {\n \t/*\n \t * we want to map things as base page size mapping so that\ndiff --git a/mm/sparse-vmemmap.c b/mm/sparse-vmemmap.c\nindex 387337bba05e..d3096de04cc6 100644\n--- a/mm/sparse-vmemmap.c\n+++ b/mm/sparse-vmemmap.c\n@@ -296,10 +296,16 @@ static int __meminit vmemmap_populate_range(unsigned long start,\n \treturn 0;\n }\n \n+static int __meminit vmemmap_populate_compound_pages(unsigned long start,\n+\t\t\t\t\t\t unsigned long end, int node,\n+\t\t\t\t\t\t struct dev_pagemap *pgmap);\n+\n int __meminit vmemmap_populate_basepages(unsigned long start, unsigned long end,\n \t\t\t\t\t int node, struct vmem_altmap *altmap,\n \t\t\t\t\t struct dev_pagemap *pgmap)\n {\n+\tif (vmemmap_can_optimize(altmap, pgmap))\n+\t\treturn vmemmap_populate_compound_pages(start, end, node, pgmap);\n \treturn vmemmap_populate_range(start, end, node, altmap, -1, 0);\n }\n \n@@ -411,6 +417,9 @@ int __meminit vmemmap_populate_hugepages(unsigned long start, unsigned long end,\n \tpud_t *pud;\n \tpmd_t *pmd;\n \n+\tif (vmemmap_can_optimize(altmap, pgmap))\n+\t\treturn vmemmap_populate_compound_pages(start, end, node, pgmap);\n+\n \tfor (addr = start; addr < end; addr = next) {\n \t\tnext = pmd_addr_end(addr, end);\n \n@@ -453,7 +462,6 @@ int __meminit vmemmap_populate_hugepages(unsigned long start, unsigned long end,\n \treturn 0;\n }\n \n-#ifndef vmemmap_populate_compound_pages\n /*\n * For compound pages bigger than section size (e.g. x86 1G compound\n * pages with 2M subsection size) fill the rest of sections as tail\n@@ -491,14 +499,14 @@ static pte_t * __meminit compound_section_tail_page(unsigned long addr)\n \treturn pte;\n }\n \n-static int __meminit vmemmap_populate_compound_pages(unsigned long start_pfn,\n-\t\t\t\t\t\t unsigned long start,\n+static int __meminit vmemmap_populate_compound_pages(unsigned long start,\n \t\t\t\t\t\t unsigned long end, int node,\n \t\t\t\t\t\t struct dev_pagemap *pgmap)\n {\n \tunsigned long size, addr;\n \tpte_t *pte;\n \tint rc;\n+\tunsigned long start_pfn = page_to_pfn((struct page *)start);\n \n \tif (reuse_compound_section(start_pfn, pgmap)) {\n \t\tpte = compound_section_tail_page(start);\n@@ -544,26 +552,18 @@ static int __meminit vmemmap_populate_compound_pages(unsigned long start_pfn,\n \treturn 0;\n }\n \n-#endif\n-\n struct page * __meminit __populate_section_memmap(unsigned long pfn,\n \t\tunsigned long nr_pages, int nid, struct vmem_altmap *altmap,\n \t\tstruct dev_pagemap *pgmap)\n {\n \tunsigned long start = (unsigned long) pfn_to_page(pfn);\n \tunsigned long end = start + nr_pages * sizeof(struct page);\n-\tint r;\n \n \tif (WARN_ON_ONCE(!IS_ALIGNED(pfn, PAGES_PER_SUBSECTION) ||\n \t\t!IS_ALIGNED(nr_pages, PAGES_PER_SUBSECTION)))\n \t\treturn NULL;\n \n-\tif (vmemmap_can_optimize(altmap, pgmap))\n-\t\tr = vmemmap_populate_compound_pages(pfn, start, end, nid, pgmap);\n-\telse\n-\t\tr = vmemmap_populate(start, end, nid, altmap, pgmap);\n-\n-\tif (r < 0)\n+\tif (vmemmap_populate(start, end, nid, altmap, pgmap))\n \t\treturn NULL;\n \n \treturn pfn_to_page(pfn);\n", "prefixes": [ "05/49" ] }