Re: [PATCH] mm/hmm: Fix bad subpage pointer in try_to_unmap_one

[Ralph Campbell]

On 7/9/19 5:28 PM, Andrew Morton wrote:
> On Tue, 9 Jul 2019 15:35:56 -0700 Ralph Campbell <rcampbell@xxxxxxxxxx> wrote:
>
> > When migrating a ZONE device private page from device memory to system
> > memory, the subpage pointer is initialized from a swap pte which computes
> > an invalid page pointer. A kernel panic results such as:
> >
> > BUG: unable to handle page fault for address: ffffea1fffffffc8
> >
> > Initialize subpage correctly before calling page_remove_rmap().
>
> I think this is
>
> Fixes:  a5430dda8a3a1c ("mm/migrate: support un-addressable ZONE_DEVICE page in migration")
> Cc: stable
>
> yes?

Yes. Can you add this or should I send a v2?