Re: [PATCH v5 4/9] perf/x86: Add compiler barrier after updating BTS

[Peter Zijlstra]

On Tue, Sep 14, 2021 at 06:05:17PM +0800, Leo Yan wrote:
> Hi Peter,
> 
> On Tue, Sep 14, 2021 at 11:51:36AM +0200, Peter Zijlstra wrote:
> > On Sun, Aug 29, 2021 at 06:56:57PM +0800, Leo Yan wrote:
> > > Hi Peter, or any x86 maintainer,
> > > 
> > > On Mon, Aug 09, 2021 at 07:14:02PM +0800, Leo Yan wrote:
> > > > Since BTS is coherent, simply add a compiler barrier to separate the BTS
> > > > update and aux_head store.
> > > 
> > > Could you reivew this patch and check if BTS needs the comipler
> > > barrier in this case?  Thanks.
> > 
> > Yes, a compiler barrier is sufficient.
> > 
> > You want me to pick it up?
> 
> Maybe other maintainers are more suitable than me to answer this :)
> 
> Yeah, I think it's great if you could pick it.

OK, done.