Re: [PATCH v3 7/7] locking/rtmutex: Acquire the hb lock via trylock after wait-proxylock.

[Sebastian Andrzej Siewior]

On 2023-09-12 12:57:45 [+0200], Peter Zijlstra wrote:
> > --- a/kernel/futex/pi.c
> > +++ b/kernel/futex/pi.c
> > @@ -1147,19 +1143,34 @@ int futex_unlock_pi(u32 __user *uaddr, unsigned int flags)
…
> > +		rt_waiter = rt_mutex_top_waiter(&pi_state->pi_mutex);
> > +		if (!rt_waiter)
> > +			goto do_uncontended;
> 
> That ^ needs to drop wait_lock before the goto.

Ach, you noticed that one. Wrote a reply a few minutes after that one.

Sebastian