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Howlett" To: David Hildenbrand Cc: linux-kernel@vger.kernel.org, Zi Yan , "Mike Rapoport (Microsoft)" , SeongJae Park , 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, 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: Re: [PATCH v1 01/36] mm: stop making SPARSEMEM_VMEMMAP user-selectable Message-ID: Mail-Followup-To: "Liam R. Howlett" , David Hildenbrand , linux-kernel@vger.kernel.org, Zi Yan , "Mike Rapoport (Microsoft)" , SeongJae Park , 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, 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 References: 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X-MS-Exchange-CrossTenant-Id: 4e2c6054-71cb-48f1-bd6c-3a9705aca71b X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: VwdVTNhN/b8RTlQvwoAkc0KBGjsllb8bvRp29OAstWP/++DcLmavzIsQSo+sEVLzDiYkmozIAnBndBVb56UNrg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH7PR10MB6481 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1099,Hydra:6.1.9,FMLib:17.12.80.40 definitions=2025-08-28_04,2025-08-28_01,2025-03-28_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 mlxlogscore=999 mlxscore=0 bulkscore=0 phishscore=0 adultscore=0 spamscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2508110000 definitions=main-2508290001 X-Authority-Analysis: v=2.4 cv=J6mq7BnS c=1 sm=1 tr=0 ts=68b0f3be b=1 cx=c_pps a=e1sVV491RgrpLwSTMOnk8w==:117 a=e1sVV491RgrpLwSTMOnk8w==:17 a=6eWqkTHjU83fiwn7nKZWdM+Sl24=:19 a=z/mQ4Ysz8XfWz/Q5cLBRGdckG28=:19 a=lCpzRmAYbLLaTzLvsPZ7Mbvzbb8=:19 a=wKuvFiaSGQ0qltdbU6+NXLB8nM8=:19 a=Ol13hO9ccFRV9qXi2t6ftBPywas=:19 a=xqWC_Br6kY4A:10 a=kj9zAlcOel0A:10 a=2OwXVqhp2XgA:10 a=GoEa3M9JfhUA:10 a=20KFwNOVAAAA:8 a=Ikd4Dj_1AAAA:8 a=VwQbUJbxAAAA:8 a=VnNF1IyMAAAA:8 a=pGLkceISAAAA:8 a=1UX6Do5GAAAA:8 a=pFyQfRViAAAA:8 a=_O3DOGVWAAAA:8 a=J1Y8HTJGAAAA:8 a=ebG-ZW-8AAAA:8 a=yPCof4ZbAAAA:8 a=3kAz48_qQRIM5rfxVM0A:9 a=CjuIK1q_8ugA:10 a=Et2XPkok5AAZYJIKzHr1:22 a=oJz5jJLG1JtSoe7EL652:22 a=2TKV-7w1aU1AVAwN0oqT:22 a=y1Q9-5lHfBjTkpIzbSAN:22 a=Bj2TwAA_C77lQ_X2_dkp:22 cc=ntf awl=host:13602 X-Proofpoint-GUID: gUJ0MDkluHsVVrgEE3WqwkuCNFAM-xYG X-Proofpoint-ORIG-GUID: gUJ0MDkluHsVVrgEE3WqwkuCNFAM-xYG X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwODIzMDAyNyBTYWx0ZWRfX39KpAFosgaI+ 6AxJ+Drns8ZQq3DKNpTTI7tfjYyjbPqsKEDy1MvT1fzSFVRUn4Sbnaebbe+QlnWqNTvSyZTbaNA AtJJvc1CJyJm240qbvZ4NobTKTOSLbw7m9T74CuNpPqC58mp8DulC6AbgBfwbFoOd0wzuUlTitX CVkLcVEkTHUl9rcnpMWap/LtQTOtEg/KSdasZlFPHDcpsRu40z7OKoo2Gr3mxo5ftHw5YA1sXX8 NGiBgSplH58wNB7P9cnaNS0HijoX9gp2b38u+E7V/9JTM+Ta8khspDU4YH4gKMTJ8ETOEoDC9jq hoTdwFZUPfV5+akDXk4WJ373Vt+kwzPqpsJ/IShFET6DffgL/XvCTe2xPr3h7abdjHAQBVC+akJ 4kQYUMaIt9UgEXeUabNaf72CL4erBQ== * David Hildenbrand [250827 18:03]: > 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 Reviewed-by: Liam R. Howlett > --- > 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 > >