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GET /api/patches/2195533/?format=api
{ "id": 2195533, "url": "http://patchwork.ozlabs.org/api/patches/2195533/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-um/patch/20260211103141.3215197-2-rppt@kernel.org/", "project": { "id": 60, "url": "http://patchwork.ozlabs.org/api/projects/60/?format=api", "name": "User-mode Linux Development", "link_name": "linux-um", "list_id": "linux-um.lists.infradead.org", "list_email": "linux-um@lists.infradead.org", "web_url": "", "scm_url": "", "webscm_url": "", "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": "not-applicable", "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/linux-um/patch/20260211103141.3215197-2-rppt@kernel.org/mbox/", "series": [ { "id": 491814, "url": "http://patchwork.ozlabs.org/api/series/491814/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-um/list/?series=491814", "date": "2026-02-11T10:31:37", "name": "arch, mm: consolidate empty_zero_page", "version": 3, "mbox": "http://patchwork.ozlabs.org/series/491814/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2195533/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2195533/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <linux-um-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org>", "X-Original-To": "incoming@patchwork.ozlabs.org", "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n secure) header.d=lists.infradead.org header.i=@lists.infradead.org\n header.a=rsa-sha256 header.s=bombadil.20210309 header.b=bpNBA77I;\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=none (no SPF record) smtp.mailfrom=lists.infradead.org\n (client-ip=2607:7c80:54:3::133; helo=bombadil.infradead.org;\n envelope-from=linux-um-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org;\n receiver=patchwork.ozlabs.org)" ], "Received": [ "from bombadil.infradead.org (bombadil.infradead.org\n [IPv6:2607:7c80:54:3::133])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519 server-signature ECDSA (secp384r1) server-digest SHA384)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4f9vrN0hJzz1xx7\n\tfor <incoming@patchwork.ozlabs.org>; Wed, 11 Feb 2026 21:32:20 +1100 (AEDT)", "from localhost ([::1] helo=bombadil.infradead.org)\n\tby bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux))\n\tid 1vq7W6-00000000VVb-2D9C;\n\tWed, 11 Feb 2026 10:32:18 +0000", "from sea.source.kernel.org ([2600:3c0a:e001:78e:0:1991:8:25])\n\tby bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux))\n\tid 1vq7W2-00000000VTP-3rJm;\n\tWed, 11 Feb 2026 10:32:16 +0000", "from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58])\n\tby sea.source.kernel.org (Postfix) with ESMTP id 7659543D75;\n\tWed, 11 Feb 2026 10:32:14 +0000 (UTC)", "by smtp.kernel.org (Postfix) with ESMTPSA id D7BD6C4CEF7;\n\tWed, 11 Feb 2026 10:32:02 +0000 (UTC)" ], "DKIM-Signature": [ "v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed;\n\td=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help\n\t:List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding:\n\tMIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From:\n\tReply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From:\n\tResent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner;\n\tbh=8fVTXwM0zNvbjsVMJfP4P1PkSZuOtnuFk6QAlesaSE0=; b=bpNBA77Ie9hSfCY2DTsrCrm0x+\n\toHUc+N8KeVXZN4U4155+p84u/SXl3gtxBQyAkMtAf07XWklNx2X4WepHg83uVJwyt3EWxP12DUEmP\n\ts65pY/MmvGnwOiPTZfDI/t6zVcC2cUuUUYg2pc+mndMMyNjq3LGWEoIN/tu5NNn3Y47zYoVqWUkKN\n\tmcGFwjexiAxS/YuNit6mLhdkwxqoCbMfrddflRczbvN7XOy0LIwGcU/XCQdByZMwAPMrDHTnTyTj1\n\ttIks7F9SicM5rkq+RuG+6QX2QZQ1qBVyV0urH+iL5690Ea9+vKW4cZju+WkUVbGfYSzHRqZYm7+XF\n\tqJDMoJ5A==;", "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>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "X-CRM114-Version": "20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 ", "X-CRM114-CacheID": "sfid-20260211_023214_990141_296C12BD ", "X-CRM114-Status": "GOOD ( 13.38 )", "X-Spam-Score": "-2.1 (--)", "X-Spam-Report": "Spam detection software,\n running on the system \"bombadil.infradead.org\",\n has NOT identified this incoming email as spam. The original\n message has been attached to this so you can view it or label\n similar future email. If you have any questions, see\n the administrator of that system for details.\n Content preview: From: \"Mike Rapoport (Microsoft)\" <rppt@kernel.org> nommu\n architectures have empty_zero_page and define ZERO_PAGE() and although they\n don't really use it to populate page tables,\n there is no reason to hardwire\n !MMU implementation of is_zero_pfn() and m [...]\n Content analysis details: (-2.1 points, 5.0 required)\n pts rule name description\n ---- ----------------------\n --------------------------------------------------\n 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record\n -0.0 SPF_PASS SPF: sender matches SPF record\n -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from\n author's\n domain\n -0.1 DKIM_VALID Message has at least one valid DKIM or DK\n signature\n 0.1 DKIM_SIGNED Message has a DKIM or DK signature,\n not necessarily valid\n -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from\n envelope-from domain\n -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1%\n [score: 0.0000]\n -0.0 DKIMWL_WL_HIGH DKIMwl.org - High trust sender", "X-BeenThere": "linux-um@lists.infradead.org", "X-Mailman-Version": "2.1.34", "Precedence": "list", "List-Id": "<linux-um.lists.infradead.org>", "List-Unsubscribe": "<http://lists.infradead.org/mailman/options/linux-um>,\n <mailto:linux-um-request@lists.infradead.org?subject=unsubscribe>", "List-Archive": "<http://lists.infradead.org/pipermail/linux-um/>", "List-Post": "<mailto:linux-um@lists.infradead.org>", "List-Help": "<mailto:linux-um-request@lists.infradead.org?subject=help>", "List-Subscribe": "<http://lists.infradead.org/mailman/listinfo/linux-um>,\n <mailto:linux-um-request@lists.infradead.org?subject=subscribe>", "Sender": "\"linux-um\" <linux-um-bounces@lists.infradead.org>", "Errors-To": "linux-um-bounces+incoming=patchwork.ozlabs.org@lists.infradead.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" ] }