Re: [BUG]locking/rwsem: only clean RWSEM_FLAG_HANDOFF when already set

[Waiman Long]

On 11/11/21 16:38, Peter Zijlstra wrote:
> On Thu, Nov 11, 2021 at 04:01:16PM -0500, Waiman Long wrote:
>
> > > > +			if (has_handoff || (!waiter->rt_task &&
> > > > +					    !time_after(jiffies, waiter->timeout)))
> > > Does ->rt_task really help over rt_task(current) ? I suppose there's an
> > > argument for locality, but that should be pretty much it, no?
> > Waiting for the timeout may introduce too much latency for RT task. That is
> > the only reason I am doing it. I can take it out if you think it is not
> > necessary.
> I meant simply calling rt_task(waiter->task) here, instead of mucking about
> with the extra variable.

OK, that make sense.

Cheers,
Longman