linux-kernel - Re: [PATCH] perf TUI: Don't throw error for zero length symbols

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Date:   Mon, 19 Dec 2016 15:15:17 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Anton Blanchard <anton@...ba.org>
Cc:     Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>,
        chris.ryder@....com, peterz@...radead.org,
        linux-kernel@...r.kernel.org, npiggin@...il.com,
        alexander.shishkin@...ux.intel.com, mingo@...hat.com,
        paulus@...ba.org, mhiramat@...nel.org,
        linuxppc-dev@...ts.ozlabs.org,
        Michael Ellerman <mpe@...erman.id.au>,
        Madhavan Srinivasan <masriniv@...ibm.com>
Subject: Re: [PATCH] perf TUI: Don't throw error for zero length symbols

Em Sat, Dec 17, 2016 at 07:27:54AM +1100, Anton Blanchard escreveu:
> Hi Ravi,
> 
> > > perf report (with TUI) exits with error when it finds a sample of
> > > zero length symbol(i.e. addr == sym->start == sym->end). Actually
> > > these are valid samples. Don't exit TUI and show report with such
> > > symbols.
> > >
> > > Link: https://lkml.org/lkml/2016/10/8/189
> 
> You can add:
> 
> Tested-by: Anton Blanchard <anton@...ba.org>
> 
> Also, since this issue makes perf report pretty much useless on
> ppc64, can we mark it for stable@, at least to get it into 4.9 where
> the ppc64 kernel changes that triggered this appeared?

Ok, added it, will be in the next pull req to Ingo.

- Arnaldo
 
> Anton
> 
> > > Reported-by: Anton Blanchard <anton@...ba.org>
> > > Signed-off-by: Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>
> > > ---
> > >  tools/perf/util/annotate.c | 3 ++-
> > >  1 file changed, 2 insertions(+), 1 deletion(-)
> > >
> > > diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
> > > index aeb5a44..430d039 100644
> > > --- a/tools/perf/util/annotate.c
> > > +++ b/tools/perf/util/annotate.c
> > > @@ -593,7 +593,8 @@ static int __symbol__inc_addr_samples(struct
> > > symbol *sym, struct map *map,
> > >
> > >  	pr_debug3("%s: addr=%#" PRIx64 "\n", __func__,
> > > map->unmap_ip(map, addr));
> > >
> > > -	if (addr < sym->start || addr >= sym->end) {
> > > +	if ((addr < sym->start || addr >= sym->end) &&
> > > +	    (addr != sym->end || sym->start != sym->end)) {
> > >  		pr_debug("%s(%d): ERANGE! sym->name=%s, start=%#"
> > > PRIx64 ", addr=%#" PRIx64 ", end=%#" PRIx64 "\n", __func__,
> > > __LINE__, sym->name, sym->start, addr, sym->end); return -ERANGE;  
> >