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[2003:d8:2f26:ba00:803:6ec5:9918:6fd]) by smtp.gmail.com with UTF8SMTPSA id 5b1f17b1804b1-45b50e1852asm8722665e9.25.2025.08.21.13.07.06 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 21 Aug 2025 13:07:08 -0700 (PDT) From: David Hildenbrand To: linux-kernel@vger.kernel.org Cc: David Hildenbrand , Huacai Chen , WANG Xuerui , Madhavan Srinivasan , Michael Ellerman , Nicholas Piggin , Christophe Leroy , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , "David S. Miller" , Andreas Larsson , Alexander Potapenko , Andrew Morton , Brendan Jackman , Christoph Lameter , Dennis Zhou , Dmitry Vyukov , dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, iommu@lists.linux.dev, io-uring@vger.kernel.org, Jason Gunthorpe , Jens Axboe , Johannes Weiner , John Hubbard , kasan-dev@googlegroups.com, kvm@vger.kernel.org, "Liam R. Howlett" , Linus Torvalds , linux-arm-kernel@axis.com, linux-arm-kernel@lists.infradead.org, linux-crypto@vger.kernel.org, linux-ide@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mips@vger.kernel.org, linux-mmc@vger.kernel.org, linux-mm@kvack.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-scsi@vger.kernel.org, Lorenzo Stoakes , Marco Elver , Marek Szyprowski , Michal Hocko , Mike Rapoport , Muchun Song , netdev@vger.kernel.org, Oscar Salvador , Peter Xu , Robin Murphy , Suren Baghdasaryan , Tejun Heo , virtualization@lists.linux.dev, Vlastimil Babka , wireguard@lists.zx2c4.com, x86@kernel.org, Zi Yan Subject: [PATCH RFC 01/35] mm: stop making SPARSEMEM_VMEMMAP user-selectable Date: Thu, 21 Aug 2025 22:06:27 +0200 Message-ID: <20250821200701.1329277-2-david@redhat.com> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20250821200701.1329277-1-david@redhat.com> References: <20250821200701.1329277-1-david@redhat.com> MIME-Version: 1.0 X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: a0_6231qEdB9xtXnTx4YEf3ZG6S6_FFxmBRcai3sgUk_1755806830 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: 8bit content-type: text/plain; charset="US-ASCII"; x-default=true X-Rspamd-Queue-Id: BBF481C0006 X-Rspamd-Server: rspam04 X-Rspam-User: X-Stat-Signature: 7ac98bs6ewsi1g58p6f8muagbsrspxjg X-HE-Tag: 1755806832-744244 X-HE-Meta: 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 a4rJwmwx 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: In an ideal world, we wouldn't have to deal with SPARSEMEM without SPARSEMEM_VMEMMAP, but in particular for 32bit SPARSEMEM_VMEMMAP is considered too costly and consequently not supported. However, if an architecture does support SPARSEMEM with SPARSEMEM_VMEMMAP, let's forbid the user to disable VMEMMAP: just like we already do for arm64, s390 and x86. So if SPARSEMEM_VMEMMAP is supported, don't allow to use SPARSEMEM without SPARSEMEM_VMEMMAP. This implies that the option to not use SPARSEMEM_VMEMMAP will now be gone for loongarch, powerpc, riscv and sparc. All architectures only enable SPARSEMEM_VMEMMAP with 64bit support, so there should not really be a big downside to using the VMEMMAP (quite the contrary). This is a preparation for not supporting (1) folio sizes that exceed a single memory section (2) CMA allocations of non-contiguous page ranges in SPARSEMEM without SPARSEMEM_VMEMMAP configs, whereby we want to limit possible impact as much as possible (e.g., gigantic hugetlb page allocations suddenly fails). Cc: Huacai Chen Cc: WANG Xuerui Cc: Madhavan Srinivasan Cc: Michael Ellerman Cc: Nicholas Piggin Cc: Christophe Leroy Cc: Paul Walmsley Cc: Palmer Dabbelt Cc: Albert Ou Cc: Alexandre Ghiti Cc: "David S. Miller" Cc: Andreas Larsson Signed-off-by: David Hildenbrand --- mm/Kconfig | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/mm/Kconfig b/mm/Kconfig index 4108bcd967848..330d0e698ef96 100644 --- a/mm/Kconfig +++ b/mm/Kconfig @@ -439,9 +439,8 @@ config SPARSEMEM_VMEMMAP_ENABLE bool config SPARSEMEM_VMEMMAP - bool "Sparse Memory virtual memmap" + def_bool y depends on SPARSEMEM && SPARSEMEM_VMEMMAP_ENABLE - default y help SPARSEMEM_VMEMMAP uses a virtually mapped memmap to optimise pfn_to_page and page_to_pfn operations. This is the most -- 2.50.1