Re: [PATCH 0/3] Convert x86/mm/pat to ptdescs

[Vishal Moola (Oracle)]

On Wed, Jan 28, 2026 at 01:52:43PM +0200, Mike Rapoport wrote:
> Hi Vishal,
> 
> On Mon, Jan 26, 2026 at 04:51:37PM -0800, Vishal Moola (Oracle) wrote:
> > x86/mm/pat should be using ptdescs. One line has already been
> > converted to pagetable_free(), while the allocation sites use
> > get_free_pages(). This causes issues separately allocating ptdescs
> > from struct page.
> > 
> > These patches convert the allocation/free sites to use ptdescs. In
> > the short term, this helps enable Matthew's work to allocate frozen
> > pagetables. And in the long term, this will help us cleanly split
> > ptdesc allocations from struct page.
> > 
> > ------
> > 
> > Based on current mm-new.
> > 
> > Vishal Moola (Oracle) (3):
> >   x86/mm/pat: Convert pte code to use ptdescs
> >   x86/mm/pat: Convert pmd code to use ptdescs
> 
> There are still get_zeroed_page() calls in populate_pgd(). I think they
> also should be converted to pagetable_alloc().

Thanks, I missed those. They should be converted too, so I'll add those
in v2.

> Other than that LGTM.
> 
> >   x86/mm/pat: Convert split_large_page() to use ptdescs
> > 
> >  arch/x86/mm/pat/set_memory.c | 37 +++++++++++++++++++-----------------
> >  1 file changed, 20 insertions(+), 17 deletions(-)
> > 
> > -- 
> > 2.52.0
> > 
> 
> -- 
> Sincerely yours,
> Mike.