Re: [PATCH] mm/huge_memory: softleaf device private fixes in remove_migration_pmd()

[David Hildenbrand (Red Hat)]

On 13.11.25 06:03, Balbir Singh wrote:
> On 11/12/25 22:37, David Hildenbrand (Red Hat) wrote:
> > On 12.11.25 05:46, Balbir Singh wrote:
> > > commit a6ca2ba46390 ("mm: replace pmd_to_swp_entry() with softleaf_from_pmd()")
> >
> > So should this be squashed into Lorenzo patch, or incorporated in his series in case he has to resend?
> >
> > > does not work with device private THP entries. softleaf_is_migration_young()
> > > asserts that the entry be a migration entry, but in the current code, the
> > > entry might already be replaced by a device private entry by the time the
> > > check is made. The issue exists with commit
> > > 7385dbdbf841 ("mm/rmap: extend rmap and migration support device-private entries")
> >
> > Because this confuses me. If it's already a problem in the commit-to-go-upstream-first, it should be fixed in that commit?
>
> Not sure how to handle this, because that would break rebase of mm/mm-new
> or I'd have to send a replacement patch for the original patch from Lorenzo
> (which does not seem right).

Yes, to be expected. Maybe Andrew can figure out how do address the 
rebase, or we can give him a helping hand :)

> I'll post a simpler patch, but it needs to be on top of the series

Agreed, thanks.

--
Cheers

David