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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 , 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 v1 01/36] mm: stop making SPARSEMEM_VMEMMAP user-selectable Date: Thu, 28 Aug 2025 00:01:05 +0200 Message-ID: <20250827220141.262669-2-david@redhat.com> In-Reply-To: <20250827220141.262669-1-david@redhat.com> References: <20250827220141.262669-1-david@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.4 X-Rspamd-Queue-Id: 9001840019 X-Stat-Signature: 9rk5guc56czoz7u7h7fnyn1okaydkyjx X-Rspam-User: X-Rspamd-Server: rspam06 X-HE-Tag: 1756332172-46750 X-HE-Meta: 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 OiR/CbOc 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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 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