[PATCH v2 05/34] mm: add utility functions for ptdesc

[Matthew Wilcox]

On Sat, May 27, 2023 at 01:41:44PM +0300, Mike Rapoport wrote:
> Sorry if I wasn't clear, by "page table page" I meant the page (or memory
> for that matter) for actual page table rather than struct page describing
> that memory.
> 
> So what we allocate here is the actual memory for the page tables and not
> the memory for the metadata. That's why I think the name ptdesc_alloc is
> confusing.

But that's going to be the common pattern in the Glorious Future.
You allocate a folio and that includes both the folio memory descriptor
and the 2^n pages of memory described by that folio.  Similarly for all
the other memory descriptors.