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

From: Anton Blanchard <[email-masked]>
Date: Sat, 17 Dec 2016 07:27:54 +1100

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 <[email-masked]>

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?

Anton

> > Reported-by: Anton Blanchard <[email-masked]>
> > Signed-off-by: Ravi Bangoria <[email-masked]>
> > ---
> >  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;  
>