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Howlett" , 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, 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, Marco Elver , Marek Szyprowski , Michal Hocko , 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 Subject: [PATCH v2 01/37] mm: stop making SPARSEMEM_VMEMMAP user-selectable Date: Mon, 1 Sep 2025 17:03:22 +0200 Message-ID: <20250901150359.867252-2-david@redhat.com> In-Reply-To: <20250901150359.867252-1-david@redhat.com> References: <20250901150359.867252-1-david@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.93 X-Stat-Signature: hrunahfpok81tbzc5pe35nywdusoring X-Rspam-User: X-Rspamd-Queue-Id: 1F0CB4000A X-Rspamd-Server: rspam01 X-HE-Tag: 1756739104-992312 X-HE-Meta: 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 TDvH6Q9K 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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). Acked-by: Zi Yan Acked-by: Mike Rapoport (Microsoft) Acked-by: SeongJae Park Reviewed-by: Wei Yang Reviewed-by: Lorenzo Stoakes Reviewed-by: Liam R. Howlett 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