Re: [PATCH v1 04/11] mm/memremap: convert to pfnmap_track() + pfnmap_untrack()

[Lorenzo Stoakes <lorenzo.stoakes@oracle.com>]

On Fri, Apr 25, 2025 at 04:00:42PM -0400, Peter Xu wrote:
> On Fri, Apr 25, 2025 at 10:17:08AM +0200, David Hildenbrand wrote:
> > Let's use the new, cleaner interface.
> >
> > Signed-off-by: David Hildenbrand <david@redhat.com>
> > ---
> >  mm/memremap.c | 8 ++++----
> >  1 file changed, 4 insertions(+), 4 deletions(-)
> >
> > diff --git a/mm/memremap.c b/mm/memremap.c
> > index 2aebc1b192da9..c417c843e9b1f 100644
> > --- a/mm/memremap.c
> > +++ b/mm/memremap.c
> > @@ -130,7 +130,7 @@ static void pageunmap_range(struct dev_pagemap *pgmap, int range_id)
> >  	}
> >  	mem_hotplug_done();
> >
> > -	untrack_pfn(NULL, PHYS_PFN(range->start), range_len(range), true);
> > +	pfnmap_untrack(PHYS_PFN(range->start), range_len(range));
> >  	pgmap_array_delete(range);
> >  }
> >
> > @@ -211,8 +211,8 @@ static int pagemap_range(struct dev_pagemap *pgmap, struct mhp_params *params,
> >  	if (nid < 0)
> >  		nid = numa_mem_id();
> >
> > -	error = track_pfn_remap(NULL, &params->pgprot, PHYS_PFN(range->start), 0,
> > -			range_len(range));
> > +	error = pfnmap_track(PHYS_PFN(range->start), range_len(range),
> > +			     &params->pgprot);
> >  	if (error)
> >  		goto err_pfn_remap;
> >
> > @@ -277,7 +277,7 @@ static int pagemap_range(struct dev_pagemap *pgmap, struct mhp_params *params,
> >  	if (!is_private)
> >  		kasan_remove_zero_shadow(__va(range->start), range_len(range));
> >  err_kasan:
> > -	untrack_pfn(NULL, PHYS_PFN(range->start), range_len(range), true);
> > +	pfnmap_untrack(PHYS_PFN(range->start), range_len(range));
>
> Not a huge deal, but maybe we could merge this and previous patch?  It
> might be easier to reference the impl when reading the call site changes.

Agreed, it would add a sort of built-in justification for the prior patch
as in 'here is where we use it, this is why I'm doing this' kind of thing
also.

And I think this is small enough combined with the previous to not be a big
deal to have both together.

Thanks!

>
> >  err_pfn_remap:
> >  	pgmap_array_delete(range);
> >  	return error;
> > --
> > 2.49.0
> >
>
> --
> Peter Xu
>