Re: [PATCH 0/1] mm: restore full accuracy in COW page reuse

[Linus Torvalds]

On Tue, Jan 12, 2021 at 6:16 PM Matthew Wilcox <willy@xxxxxxxxxxxxx> wrote:
>
> The thing about the speculative page cache references is that they can
> temporarily bump a refcount on a page which _used_ to be in the page
> cache and has now been reallocated as some other kind of page.

Right you are. Yeah, scratch the "we could make it absolute on 1", and
we do need the PIN count elevation.

           Linus