Re: [PATCH 02/16] mm: introduce leaf entry type and use to simplify leaf entry logic

[Matthew Wilcox]

On Mon, Nov 03, 2025 at 12:31:43PM +0000, Lorenzo Stoakes wrote:
> The kernel maintains leaf page table entries which contain either:
> 
> - Nothing ('none' entries)
> - Present entries (that is stuff the hardware can navigate without fault)
> - Everything else that will cause a fault which the kernel handles

The problem is that we're already using 'pmd leaf entries' to mean "this
is a pointer to a PMD entry rather than a table of PTEs".  So I think
we need a new name.  A boring name would be 'swent' (software entry).
An acronym would be SWE.  In the XArray I distinguish between pointer
entries and value entries -- would calling them value entries work here?
Or we could call them something entirely different.  Say 'twig'.  Or
'cask'.