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GET /api/1.2/patches/2219944/?format=api
{ "id": 2219944, "url": "http://patchwork.ozlabs.org/api/1.2/patches/2219944/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260405125240.2558577-20-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": "<20260405125240.2558577-20-songmuchun@bytedance.com>", "list_archive_url": "https://lore.kernel.org/linuxppc-dev/20260405125240.2558577-20-songmuchun@bytedance.com/", "date": "2026-04-05T12:52:10", "name": "[19/49] mm/sparse-vmemmap: remove the VMEMMAP_POPULATE_PAGEREF flag", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "3846195e1173dc4c6628d9a59edb20616ad39d83", "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/20260405125240.2558577-20-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/2219944/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2219944/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <linuxppc-dev+bounces-19349-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=ilM/9sud;\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 19/49] mm/sparse-vmemmap: remove the VMEMMAP_POPULATE_PAGEREF\n flag", "Date": "Sun, 5 Apr 2026 20:52:10 +0800", "Message-Id": "<20260405125240.2558577-20-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": "The VMEMMAP_POPULATE_PAGEREF flag is only used to ensure that we call\nget_page() when slab is available, as mentioned in the comment:\n\"and through vmemmap_populate_compound_pages() when slab is available\".\n\nSince we can check slab_is_available() directly, the flag and the\nassociated argument passing can be removed to simplify the code.\n\nSigned-off-by: Muchun Song <songmuchun@bytedance.com>\n---\n mm/sparse-vmemmap.c | 40 ++++++++++++++--------------------------\n 1 file changed, 14 insertions(+), 26 deletions(-)", "diff": "diff --git a/mm/sparse-vmemmap.c b/mm/sparse-vmemmap.c\nindex 26cb55c12a83..3fdb6808e8ab 100644\n--- a/mm/sparse-vmemmap.c\n+++ b/mm/sparse-vmemmap.c\n@@ -33,13 +33,6 @@\n #include <asm/tlbflush.h>\n \n #include \"hugetlb_vmemmap.h\"\n-\n-/*\n- * Flags for vmemmap_populate_range and friends.\n- */\n-/* Get a ref on the head page struct page, for ZONE_DEVICE compound pages */\n-#define VMEMMAP_POPULATE_PAGEREF\t0x0001\n-\n #include \"internal.h\"\n \n /*\n@@ -152,8 +145,8 @@ void __meminit vmemmap_verify(pte_t *pte, int node,\n }\n \n static pte_t * __meminit vmemmap_pte_populate(pmd_t *pmd, unsigned long addr, int node,\n-\t\t\t\t struct vmem_altmap *altmap,\n-\t\t\t\t unsigned long ptpfn, unsigned long flags)\n+\t\t\t\t\t struct vmem_altmap *altmap,\n+\t\t\t\t\t unsigned long ptpfn)\n {\n \tpte_t *pte = pte_offset_kernel(pmd, addr);\n \tif (pte_none(ptep_get(pte))) {\n@@ -175,7 +168,7 @@ static pte_t * __meminit vmemmap_pte_populate(pmd_t *pmd, unsigned long addr, in\n \t\t\t * and through vmemmap_populate_compound_pages() when\n \t\t\t * slab is available.\n \t\t\t */\n-\t\t\tif (flags & VMEMMAP_POPULATE_PAGEREF)\n+\t\t\tif (slab_is_available())\n \t\t\t\tget_page(pfn_to_page(ptpfn));\n \t\t}\n \t\tentry = pfn_pte(ptpfn, PAGE_KERNEL);\n@@ -248,8 +241,7 @@ static pgd_t * __meminit vmemmap_pgd_populate(unsigned long addr, int node)\n \n static pte_t * __meminit vmemmap_populate_address(unsigned long addr, int node,\n \t\t\t\t\t struct vmem_altmap *altmap,\n-\t\t\t\t\t unsigned long ptpfn,\n-\t\t\t\t\t unsigned long flags)\n+\t\t\t\t\t unsigned long ptpfn)\n {\n \tpgd_t *pgd;\n \tp4d_t *p4d;\n@@ -269,7 +261,7 @@ static pte_t * __meminit vmemmap_populate_address(unsigned long addr, int node,\n \tpmd = vmemmap_pmd_populate(pud, addr, node);\n \tif (!pmd)\n \t\treturn NULL;\n-\tpte = vmemmap_pte_populate(pmd, addr, node, altmap, ptpfn, flags);\n+\tpte = vmemmap_pte_populate(pmd, addr, node, altmap, ptpfn);\n \tif (!pte)\n \t\treturn NULL;\n \tvmemmap_verify(pte, node, addr, addr + PAGE_SIZE);\n@@ -280,15 +272,14 @@ static pte_t * __meminit vmemmap_populate_address(unsigned long addr, int node,\n static int __meminit vmemmap_populate_range(unsigned long start,\n \t\t\t\t\t unsigned long end, int node,\n \t\t\t\t\t struct vmem_altmap *altmap,\n-\t\t\t\t\t unsigned long ptpfn,\n-\t\t\t\t\t unsigned long flags)\n+\t\t\t\t\t unsigned long ptpfn)\n {\n \tunsigned long addr = start;\n \tpte_t *pte;\n \n \tfor (; addr < end; addr += PAGE_SIZE) {\n \t\tpte = vmemmap_populate_address(addr, node, altmap,\n-\t\t\t\t\t ptpfn, flags);\n+\t\t\t\t\t ptpfn);\n \t\tif (!pte)\n \t\t\treturn -ENOMEM;\n \t}\n@@ -306,7 +297,7 @@ int __meminit vmemmap_populate_basepages(unsigned long start, unsigned long end,\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+\treturn vmemmap_populate_range(start, end, node, altmap, -1);\n }\n \n /*\n@@ -382,7 +373,7 @@ int __meminit vmemmap_populate_hvo(unsigned long addr, unsigned long end,\n \t\treturn -ENOMEM;\n \n \tfor (maddr = addr; maddr < addr + headsize; maddr += PAGE_SIZE) {\n-\t\tpte = vmemmap_populate_address(maddr, node, NULL, -1, 0);\n+\t\tpte = vmemmap_populate_address(maddr, node, NULL, -1);\n \t\tif (!pte)\n \t\t\treturn -ENOMEM;\n \t}\n@@ -390,8 +381,7 @@ int __meminit vmemmap_populate_hvo(unsigned long addr, unsigned long end,\n \t/*\n \t * Reuse the last page struct page mapped above for the rest.\n \t */\n-\treturn vmemmap_populate_range(maddr, end, node, NULL,\n-\t\t\t\t page_to_pfn(tail), 0);\n+\treturn vmemmap_populate_range(maddr, end, node, NULL, page_to_pfn(tail));\n }\n #endif\n \n@@ -518,8 +508,7 @@ static int __meminit vmemmap_populate_compound_pages(unsigned long start,\n \t\t * with just tail struct pages.\n \t\t */\n \t\treturn vmemmap_populate_range(start, end, node, NULL,\n-\t\t\t\t\t pte_pfn(ptep_get(pte)),\n-\t\t\t\t\t VMEMMAP_POPULATE_PAGEREF);\n+\t\t\t\t\t pte_pfn(ptep_get(pte)));\n \t}\n \n \tsize = min(end - start, pgmap_vmemmap_nr(pgmap) * sizeof(struct page));\n@@ -527,13 +516,13 @@ static int __meminit vmemmap_populate_compound_pages(unsigned long start,\n \t\tunsigned long next, last = addr + size;\n \n \t\t/* Populate the head page vmemmap page */\n-\t\tpte = vmemmap_populate_address(addr, node, NULL, -1, 0);\n+\t\tpte = vmemmap_populate_address(addr, node, NULL, -1);\n \t\tif (!pte)\n \t\t\treturn -ENOMEM;\n \n \t\t/* Populate the tail pages vmemmap page */\n \t\tnext = addr + PAGE_SIZE;\n-\t\tpte = vmemmap_populate_address(next, node, NULL, -1, 0);\n+\t\tpte = vmemmap_populate_address(next, node, NULL, -1);\n \t\tif (!pte)\n \t\t\treturn -ENOMEM;\n \n@@ -543,8 +532,7 @@ static int __meminit vmemmap_populate_compound_pages(unsigned long start,\n \t\t */\n \t\tnext += PAGE_SIZE;\n \t\trc = vmemmap_populate_range(next, last, node, NULL,\n-\t\t\t\t\t pte_pfn(ptep_get(pte)),\n-\t\t\t\t\t VMEMMAP_POPULATE_PAGEREF);\n+\t\t\t\t\t pte_pfn(ptep_get(pte)));\n \t\tif (rc)\n \t\t\treturn -ENOMEM;\n \t}\n", "prefixes": [ "19/49" ] }