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

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Message-ID: <aXpgvYe1BySUXnKf@fedora>
Date: Wed, 28 Jan 2026 11:17:17 -0800
From: "Vishal Moola (Oracle)" <vishal.moola@...il.com>
To: Mike Rapoport <rppt@...nel.org>
Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org, x86@...nel.org,
	akpm@...ux-foundation.org,
	"Matthew Wilcox (Oracle)" <willy@...radead.org>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Andy Lutomirski <luto@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH 0/3] Convert x86/mm/pat to ptdescs

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.