Re: [PATCH] mm: Move nth_page from folio_page into folio_next

[Matthew Wilcox]

On Thu, Mar 13, 2025 at 12:40:34PM +0800, Herbert Xu wrote:
> Discontiguous memory may require the use of nth_page instead of adding
> to struct page arithmetically.  However, discontiguous memory cannot
> exist within a single folio.

That isn't true.  HugeTLB can construct a folio which crosses a
contiguity boundary.