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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: On Thu, Aug 21, 2025 at 10:06:26PM +0200, David Hildenbrand wrote: > As discussed recently with Linus, nth_page() is just nasty and we would > like to remove it. > > To recap, the reason we currently need nth_page() within a folio is because > on some kernel configs (SPARSEMEM without SPARSEMEM_VMEMMAP), the > memmap is allocated per memory section. > > While buddy allocations cannot cross memory section boundaries, hugetlb > and dax folios can. > > So crossing a memory section means that "page++" could do the wrong thing. > Instead, nth_page() on these problematic configs always goes from > page->pfn, to the go from (++pfn)->page, which is rather nasty. > > Likely, many people have no idea when nth_page() is required and when > it might be dropped. > > We refer to such problematic PFN ranges and "non-contiguous pages". > If we only deal with "contiguous pages", there is not need for nth_page(). > > Besides that "obvious" folio case, we might end up using nth_page() > within CMA allocations (again, could span memory sections), and in > one corner case (kfence) when processing memblock allocations (again, > could span memory sections). I browsed the patches and it looks great to me, thanks for doing this Jason