Re: [PATCH 1/1] userfaultfd: do not block on locking a large folio with raised refcount

Matthew Wilcox
2025-02-26T16:16:41Z

On Wed, Feb 26, 2025 at 08:11:25AM -0800, Suren Baghdasaryan wrote:
> On Wed, Feb 26, 2025 at 6:59 AM Liam R. Howlett <Liam.Howlett@oracle.com> wrote:
> > Reversing the locking/folio_get() is okay because of the src_ptl spin
> > lock, right? It might be worth saying something about it in the
> > comment?
>
> That is correct. We take both folio lock and refcount before we drop
> PTL. I'll add a comment. Thanks!

In the commit message, not in the code, please.