Re: [PATCH 05/26] perf tools: Add build_id__is_defined function

[Arnaldo Carvalho de Melo]

Em Mon, Sep 14, 2020 at 10:47:01PM +0200, Jiri Olsa escreveu:
> On Mon, Sep 14, 2020 at 02:44:35PM +0900, Namhyung Kim wrote:
> > On Mon, Sep 14, 2020 at 6:05 AM Jiri Olsa <jolsa@xxxxxxxxxx> wrote:
> > >
> > > Adding build_id__is_defined helper to check build id
> > > is defined and is != zero build id.
> > >
> > > Signed-off-by: Jiri Olsa <jolsa@xxxxxxxxxx>
> > > ---
> > >  tools/perf/util/build-id.c | 11 +++++++++++
> > >  tools/perf/util/build-id.h |  1 +
> > >  2 files changed, 12 insertions(+)
> > >
> > > diff --git a/tools/perf/util/build-id.c b/tools/perf/util/build-id.c
> > > index 31207b6e2066..bdee4e08e60d 100644
> > > --- a/tools/perf/util/build-id.c
> > > +++ b/tools/perf/util/build-id.c
> > > @@ -902,3 +902,14 @@ bool perf_session__read_build_ids(struct perf_session *session, bool with_hits)
> > >
> > >         return ret;
> > >  }
> > > +
> > > +bool build_id__is_defined(const u8 *build_id)
> > > +{
> > > +       static u8 zero[BUILD_ID_SIZE];
> > > +       int err = 0;
> > > +
> > > +       if (build_id)
> > > +               err = memcmp(build_id, &zero, BUILD_ID_SIZE);
> > > +
> > > +       return err ? true : false;
> > > +}
> > 
> > I think this is a bit confusing.. How about this?
> > 
> >   bool ret = false;
> >   if (build_id)
> >       ret = memcmp(...);
> >   return ret;
> 
> ok
> 
> > 
> > Or, it can be a oneliner..
> 
> everything can be oneliner ;-)

But has to pass checkpatch.pl, so no more than 80 chars.

;-)

- Arnaldo