Re: [PATCH] perf/core: Add SRCU annotation for pmus list walk

[Sebastian Andrzej Siewior]

On 2019-11-29 15:05:22 [-0500], Joel Fernandes wrote:
> On Tue, Nov 19, 2019 at 01:14:29PM +0100, Sebastian Andrzej Siewior wrote:
> > Since commit
> >    28875945ba98d ("rcu: Add support for consolidated-RCU reader checking")
> > 
> > there is an additional check to ensure that a RCU related lock is held
> > while the RCU list is iterated.
> > This section holds the SRCU reader lock instead.
> > 
> > Add annotation to list_for_each_entry_rcu() that pmus_srcu must be
> > acquired during the list traversal.
> > 
> 
> Reviewed-by: Joel Fernandes (Google) <joel@xxxxxxxxxxxxxxxxx>
> 
> thanks,
> 
>  - Joel
> 
> > Signed-off-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
> > ---
> > 
> > I see the warning in in v5.4-rc during boot. For some reason I don't see
> > it in tip/master during boot but "perf stat w" triggers it again (among
> > other things).

kind ping

Sebastian