[Nouveau] [PATCH] mm: Take a page reference when removing device exclusive entries

[Alistair Popple]

Alistair Popple <apopple at nvidia.com> writes:

> John Hubbard <jhubbard at nvidia.com> writes:
>
>> On 3/28/23 20:16, Matthew Wilcox wrote:
>> ...
>>>> +	if (!get_page_unless_zero(vmf->page))
>>>> +		return 0;
>>>  From a folio point of view: what the hell are you doing here?  Tail
>>> pages don't have individual refcounts; all the refcounts are actually
>
> I had stuck with using the page because none of this stuff (yet)
> supports compound pages anyway so we shouldn't see a tail page
> anyway. But point taken, I admit I need to find some time to get a
> deeper internalised understanding of folios than just s/page/folio.

And looking at this while updating it made the mixed usage of page/folio
look really werid/wrong so thanks for pointing that out. Will send an
update.