Re: [PATCH -next] perf bench: fix return value check in do_run_multi_threaded()

From: Arnaldo Carvalho de Melo
Date: Thu Sep 03 2020 - 14:54:57 EST


Em Thu, Sep 03, 2020 at 03:53:01PM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Wed, Sep 02, 2020 at 10:05:26PM +0800, YueHaibing escreveu:
> > In case of error, the function perf_session__new() returns ERR_PTR()
> > and never returns NULL. The NULL test in the return value check
> > should be replaced with IS_ERR()
> >
> > Fixes: 13edc237200c ("perf bench: Add a multi-threaded synthesize benchmark")
> > Signed-off-by: YueHaibing <yuehaibing@xxxxxxxxxx>
>
> Thanks, applied, kudos for adding the Fixes: tag, appreciated!

But...

> > ---
> > tools/perf/bench/synthesize.c | 4 ++--
> > 1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/tools/perf/bench/synthesize.c b/tools/perf/bench/synthesize.c
> > index 8d624aea1c5e..e39daa609db2 100644
> > --- a/tools/perf/bench/synthesize.c
> > +++ b/tools/perf/bench/synthesize.c
> > @@ -162,8 +162,8 @@ static int do_run_multi_threaded(struct target *target,
> > init_stats(&event_stats);
> > for (i = 0; i < multi_iterations; i++) {
> > session = perf_session__new(NULL, false, NULL);
> > - if (!session)
> > - return -ENOMEM;
> > + if (IS_ERR(session)) {
> > + return PTR_ERR(session);

This doesn't compile, so I take back that kudo ;-\

I'm fixing this by removing that needless '{'.

Please be more careful,

- Arnaldo

> >
> > atomic_set(&event_count, 0);
> > gettimeofday(&start, NULL);
> > --
> > 2.17.1
> >
> >
>
> --
>
> - Arnaldo

--

- Arnaldo