Re: Regression on linux-next (next-20260324 )

Peter Zijlstra
2026-04-21T20:56:59Z

On Tue, Apr 21, 2026 at 10:29:28AM -0700, John Stultz wrote:
> On Tue, Apr 21, 2026 at 8:48 AM K Prateek Nayak <kprateek.nayak@amd.com> wrote:
> > On 4/21/2026 8:07 PM, Peter Zijlstra wrote:
> > >> First hunk orders the first_waiter if we are attaching to the
> > >> tail of current first_waiter which would have previously ended
> > >> up next to list_head.
> > >
> > > This is the case in __ww_mutex_add_waiter() where pos == first, right?
> > >
> > > Argh, I see... yes. Perhaps something like the below though?
> >
> > Neat! Thank you for cleaning it up. Those, along with the changes in
> > ww_mutex.h fix the issue of ww-mutex_test hanging in my case. Feel free
> > to include:
> >
> > Tested-by: K Prateek Nayak <kprateek.nayak@amd.com>
>
> Same. With Peter's change and K Prateek's ww_mutex.h change it looks
> like it's working for me.
>
> Thank you both!
> Tested-by: John Stultz <jstultz@google.com>

Excellent, I'll write it up tomorrow.