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GET /api/patches/2195546/?format=api
{ "id": 2195546, "url": "http://patchwork.ozlabs.org/api/patches/2195546/?format=api", "web_url": "http://patchwork.ozlabs.org/project/sparclinux/patch/20260211103141.3215197-2-rppt@kernel.org/", "project": { "id": 10, "url": "http://patchwork.ozlabs.org/api/projects/10/?format=api", "name": "Linux SPARC Development ", "link_name": "sparclinux", "list_id": "sparclinux.vger.kernel.org", "list_email": "sparclinux@vger.kernel.org", "web_url": null, "scm_url": null, "webscm_url": null, "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260211103141.3215197-2-rppt@kernel.org>", "list_archive_url": null, "date": "2026-02-11T10:31:38", "name": "[v3,1/4] mm: don't special case !MMU for is_zero_pfn() and my_zero_pfn()", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "3e63e2903cf0274f5a33468a5716690c0c80537a", "submitter": { "id": 77733, "url": "http://patchwork.ozlabs.org/api/people/77733/?format=api", "name": "Mike Rapoport", "email": "rppt@kernel.org" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/sparclinux/patch/20260211103141.3215197-2-rppt@kernel.org/mbox/", "series": [ { "id": 491817, "url": "http://patchwork.ozlabs.org/api/series/491817/?format=api", "web_url": "http://patchwork.ozlabs.org/project/sparclinux/list/?series=491817", "date": "2026-02-11T10:31:37", "name": "arch, mm: consolidate empty_zero_page", "version": 3, "mbox": "http://patchwork.ozlabs.org/series/491817/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2195546/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2195546/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <SRS0=H3hz=AP=vger.kernel.org=sparclinux+bounces-6259-patchwork-incoming=ozlabs.org@ozlabs.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "sparclinux@vger.kernel.org" ], "Delivered-To": [ "patchwork-incoming@legolas.ozlabs.org", "patchwork-incoming@ozlabs.org" ], "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256\n header.s=k20201202 header.b=TFe7/nLN;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=ozlabs.org\n (client-ip=2404:9400:2221:ea00::3; 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arc=none smtp.client-ip=10.30.226.201" ], "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org;\n\ts=k20201202; t=1770805934;\n\tbh=IrP0HcvbxJyr+QPUUgTWRvTOZExBIyn/P520HSFeTE0=;\n\th=From:To:Cc:Subject:Date:In-Reply-To:References:From;\n\tb=TFe7/nLN+rKkMzW67S9vCNdZrax/kPne+WpMF87k95gqGlUzqF+fR5WSEUhJQdT3j\n\t pPxb8u1Ax2zDRwbXDSOUkXQnSyyGT9ATA7S3mMXNx2TRCmDY+UML8uqdt2x5uN5KOn\n\t Myw0c7iyqZfsQ6nIDluj/Ct6feChieIpAVe31sKpg0gTQ8BQT8IA1FdMJRou60J6Id\n\t rBVyOi00C1KINFPks7VJijlaVTWk5jn2wnNxzaifUW5ZIAAy72z1/aL01QcnnfNWRP\n\t Oom4Kb7P8HeZb9qPQLur3tBkv0FhMqGVt2yWCiPLRGAsku2RHRh3DuKoejRqRBa2Dx\n\t Gdc7juu6vCfng==", "From": "Mike Rapoport <rppt@kernel.org>", "To": "Andrew Morton <akpm@linux-foundation.org>", "Cc": "Andreas Larsson <andreas@gaisler.com>,\n\tBorislav Petkov <bp@alien8.de>,\n\tBrian Cain <bcain@kernel.org>,\n\tCatalin Marinas <catalin.marinas@arm.com>,\n\t\"Christophe Leroy (CS GROUP)\" <chleroy@kernel.org>,\n\t\"David S. Miller\" <davem@davemloft.net>,\n\tDave Hansen <dave.hansen@linux.intel.com>,\n\tDavid Hildenbrand <david@kernel.org>,\n\tDinh Nguyen <dinguyen@kernel.org>,\n\tGeert Uytterhoeven <geert@linux-m68k.org>,\n\tGuo Ren <guoren@kernel.org>,\n\tHelge Deller <deller@gmx.de>,\n\tHuacai Chen <chenhuacai@kernel.org>,\n\tIngo Molnar <mingo@redhat.com>,\n\tJohannes Berg <johannes@sipsolutions.net>,\n\tJohn Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>,\n\t\"Liam R. Howlett\" <Liam.Howlett@oracle.com>,\n\tLorenzo Stoakes <lorenzo.stoakes@oracle.com>,\n\tMadhavan Srinivasan <maddy@linux.ibm.com>,\n\tMagnus Lindholm <linmag7@gmail.com>,\n\tMatt Turner <mattst88@gmail.com>,\n\tMax Filippov <jcmvbkbc@gmail.com>,\n\tMichael Ellerman <mpe@ellerman.id.au>,\n\tMichal Hocko <mhocko@suse.com>,\n\tMichal Simek <monstr@monstr.eu>,\n\tMike Rapoport <rppt@kernel.org>,\n\tPalmer Dabbelt <palmer@dabbelt.com>,\n\tRichard Weinberger <richard@nod.at>,\n\tRussell King <linux@armlinux.org.uk>,\n\tStafford Horne <shorne@gmail.com>,\n\tSuren Baghdasaryan <surenb@google.com>,\n\tThomas Gleixner <tglx@kernel.org>,\n\tVineet Gupta <vgupta@kernel.org>,\n\tVlastimil Babka <vbabka@suse.cz>,\n\tWill Deacon <will@kernel.org>,\n\tlinux-alpha@vger.kernel.org,\n\tlinux-kernel@vger.kernel.org,\n\tlinux-snps-arc@lists.infradead.org,\n\tlinux-arm-kernel@lists.infradead.org,\n\tlinux-csky@vger.kernel.org,\n\tlinux-hexagon@vger.kernel.org,\n\tloongarch@lists.linux.dev,\n\tlinux-m68k@lists.linux-m68k.org,\n\tlinux-openrisc@vger.kernel.org,\n\tlinux-parisc@vger.kernel.org,\n\tlinuxppc-dev@lists.ozlabs.org,\n\tlinux-riscv@lists.infradead.org,\n\tlinux-sh@vger.kernel.org,\n\tsparclinux@vger.kernel.org,\n\tlinux-um@lists.infradead.org,\n\tlinux-mm@kvack.org,\n\tx86@kernel.org", "Subject": "[PATCH v3 1/4] mm: don't special case !MMU for is_zero_pfn() and\n my_zero_pfn()", "Date": "Wed, 11 Feb 2026 12:31:38 +0200", "Message-ID": "<20260211103141.3215197-2-rppt@kernel.org>", "X-Mailer": "git-send-email 2.51.0", "In-Reply-To": "<20260211103141.3215197-1-rppt@kernel.org>", "References": "<20260211103141.3215197-1-rppt@kernel.org>", "Precedence": "bulk", "X-Mailing-List": "sparclinux@vger.kernel.org", "List-Id": "<sparclinux.vger.kernel.org>", "List-Subscribe": "<mailto:sparclinux+subscribe@vger.kernel.org>", "List-Unsubscribe": "<mailto:sparclinux+unsubscribe@vger.kernel.org>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "X-Spam-Status": "No, score=-1.2 required=5.0 tests=ARC_SIGNED,ARC_VALID,\n\tDKIMWL_WL_HIGH,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DMARC_PASS,\n\tMAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=disabled\n\tversion=4.0.1", "X-Spam-Checker-Version": "SpamAssassin 4.0.1 (2024-03-25) on gandalf.ozlabs.org" }, "content": "From: \"Mike Rapoport (Microsoft)\" <rppt@kernel.org>\n\nnommu architectures have empty_zero_page and define ZERO_PAGE() and\nalthough they don't really use it to populate page tables, there is no\nreason to hardwire !MMU implementation of is_zero_pfn() and my_zero_pfn()\nto 0.\n\nDrop #ifdef CONFIG_MMU around implementations of is_zero_pfn() and\nmy_zero_pfn() and remove !MMU version.\n\nWhile on it, make zero_pfn __ro_after_init.\n\nSigned-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>\n---\n include/linux/pgtable.h | 14 +-------------\n mm/memory.c | 13 -------------\n mm/mm_init.c | 10 ++++++++++\n 3 files changed, 11 insertions(+), 26 deletions(-)", "diff": "diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h\nindex 827dca25c0bc..08a88b0d56e5 100644\n--- a/include/linux/pgtable.h\n+++ b/include/linux/pgtable.h\n@@ -1882,7 +1882,6 @@ static inline void pfnmap_setup_cachemode_pfn(unsigned long pfn, pgprot_t *prot)\n \tpfnmap_setup_cachemode(pfn, PAGE_SIZE, prot);\n }\n \n-#ifdef CONFIG_MMU\n #ifdef __HAVE_COLOR_ZERO_PAGE\n static inline int is_zero_pfn(unsigned long pfn)\n {\n@@ -1905,18 +1904,7 @@ static inline unsigned long my_zero_pfn(unsigned long addr)\n \textern unsigned long zero_pfn;\n \treturn zero_pfn;\n }\n-#endif\n-#else\n-static inline int is_zero_pfn(unsigned long pfn)\n-{\n-\treturn 0;\n-}\n-\n-static inline unsigned long my_zero_pfn(unsigned long addr)\n-{\n-\treturn 0;\n-}\n-#endif /* CONFIG_MMU */\n+#endif /* __HAVE_COLOR_ZERO_PAGE */\n \n #ifdef CONFIG_MMU\n \ndiff --git a/mm/memory.c b/mm/memory.c\nindex 187f16b7e996..51d2018a387a 100644\n--- a/mm/memory.c\n+++ b/mm/memory.c\n@@ -162,21 +162,8 @@ static int __init disable_randmaps(char *s)\n }\n __setup(\"norandmaps\", disable_randmaps);\n \n-unsigned long zero_pfn __read_mostly;\n-EXPORT_SYMBOL(zero_pfn);\n-\n unsigned long highest_memmap_pfn __read_mostly;\n \n-/*\n- * CONFIG_MMU architectures set up ZERO_PAGE in their paging_init()\n- */\n-static int __init init_zero_pfn(void)\n-{\n-\tzero_pfn = page_to_pfn(ZERO_PAGE(0));\n-\treturn 0;\n-}\n-early_initcall(init_zero_pfn);\n-\n void mm_trace_rss_stat(struct mm_struct *mm, int member)\n {\n \ttrace_rss_stat(mm, member);\ndiff --git a/mm/mm_init.c b/mm/mm_init.c\nindex 1a29a719af58..dcf9eff34f83 100644\n--- a/mm/mm_init.c\n+++ b/mm/mm_init.c\n@@ -53,6 +53,9 @@ EXPORT_SYMBOL(mem_map);\n void *high_memory;\n EXPORT_SYMBOL(high_memory);\n \n+unsigned long zero_pfn __ro_after_init;\n+EXPORT_SYMBOL(zero_pfn);\n+\n #ifdef CONFIG_DEBUG_MEMORY_INIT\n int __meminitdata mminit_loglevel;\n \n@@ -2667,6 +2670,13 @@ static void __init mem_init_print_info(void)\n \t\t);\n }\n \n+static int __init init_zero_pfn(void)\n+{\n+\tzero_pfn = page_to_pfn(ZERO_PAGE(0));\n+\treturn 0;\n+}\n+early_initcall(init_zero_pfn);\n+\n void __init __weak arch_mm_preinit(void)\n {\n }\n", "prefixes": [ "v3", "1/4" ] }