Re: [PATCH v2 0/4] futex: Drop ROBUST_LIST_LIMIT

[André Almeida]

Em 03/02/2025 10:29, Peter Zijlstra escreveu:
> On Tue, Jan 28, 2025 at 08:50:41AM +0100, Florian Weimer wrote:
> > * André Almeida:
> >
> > > As requested by Peter at [1], this patchset drops the
> > > ROBUST_LIST_LIMIT. This is achieve by simply rewriting the processed
> > > list element ->next to point to the head->list address, destroying the
> > > linked list to avoid any circular list.
>
> Well, I suggested we do this for a new robust list.
>
> > Furthermore, I'm not entirely sure
> > if this is entirely backwards-compatible.
>
> I share Florian's concern about backward compat here. It might work, it
> might not.
>
> I was just saying that if we're going to be doing new robust lists, we
> should try and fix all the known wrongs, and this one lets us get rid of the limit.

Oh, now I see, thanks for the clarification. I will add this for the new 
interface then.

In the meanwhile, if you can a look at  patch 3/4 "selftests/futex: 
Create test for robust list" that would help to make sure the new 
interface don't mess with the old one.