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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, 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: Re: [PATCH v1 01/36] mm: stop making SPARSEMEM_VMEMMAP user-selectable Message-ID: References: <20250827220141.262669-1-david@redhat.com> <20250827220141.262669-2-david@redhat.com> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250827220141.262669-2-david@redhat.com> X-ClientProxiedBy: LO2P265CA0507.GBRP265.PROD.OUTLOOK.COM (2603:10a6:600:13b::14) 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nPgM7U1GDVh9gYcUZpCILke8cR5+MzcUvbwgSwnk1qfFii3FSDjFsYiCanp4uXPXNZZxnw5QdBq ForBPZxOyRuf8b1G48X403o7R/zenRCY0+rbdPDYuTGxw2Ie/Z3nFfCL+ameNHmLO2X7xP3xMAG 5OXQvFRa0fbJyqXERg+V0D0nR0NtYw== X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" On Thu, Aug 28, 2025 at 12:01:05AM +0200, David Hildenbrand wrote: > 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). Nice! And I see SPARSEMEM_VMEMMAP_ENABLE is selected by the arches which support it, as you say 64-bit (or in other words - modern :) > > This is a preparation for not supporting > > (1) folio sizes that exceed a single memory section > (2) CMA allocations of non-contiguous page ranges Nice. This should simplify things... :) > > 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 LGTM, so: Reviewed-by: Lorenzo Stoakes > --- > 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 >