linux-kernel - Re: [PATCH] perf record: Limit --intr-regs to platforms supporting PERF

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Message-ID: <20150929163136.GA24723@naverao1-tp.ibm.com>
Date:	Tue, 29 Sep 2015 22:01:36 +0530
From:	"Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	"mingo@...hat.com" <mingo@...hat.com>,
	Stephane Eranian <eranian@...gle.com>,
	Sukadev Bhattiprolu <sukadev@...ux.vnet.ibm.com>,
	linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH] perf record: Limit --intr-regs to platforms supporting
 PERF_REGS

On 2015/09/29 12:47PM, Jiri Olsa wrote:
> On Tue, Sep 29, 2015 at 01:30:10PM +0530, Naveen N. Rao wrote:
> 
> SNIP
> 
> > > > Suka has also posted a fix for this with a different approach [1]. Can 
> > > > you please ack/pull one of these versions? Building perf is broken on 
> > > > v4.3-rc due to this.
> > > 
> > > I did not get any answer for additional comments I made to the patch
> > > (couldnt get marc.info working, sending the patch again)
> > 
> > Hi Jiri,
> > I concur with the changes you proposed to my patch here (getting rid of 
> > the weak variant):
> > http://article.gmane.org/gmane.linux.kernel/2046108
> > 
> > I am aware of the other approach you posted (and the one attached 
> > below). When I said "please ack/pull one of these versions", I meant one 
> > of: your version, Suka's and mine.
> 
> I was hoping somebody could test it on ppc ;-)
> 
> I think the last version (in my last email) that keeps the weak
> variable is correct, let's wait for Arnaldo to sort this out

I just tried it, but it fails. As Suka points out in his patch:
"Adding perf_regs.o to util/Build unconditionally, exposes a 
redefinition error for 'perf_reg_value()' function (due to the static 
inline version in util/perf_regs.h). So use #ifdef 
HAVE_PERF_REGS_SUPPORT' around that function."

- Naveen

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