linux-kernel - Re: [PATCH v3 4/8] perf cs-etm: Fix bitmap for option

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Date:   Tue, 9 Feb 2021 09:58:55 +0800
From:   Leo Yan <leo.yan@...aro.org>
To:     Mathieu Poirier <mathieu.poirier@...aro.org>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Mike Leach <mike.leach@...aro.org>,
        Jonathan Corbet <corbet@....net>,
        John Garry <john.garry@...wei.com>,
        Will Deacon <will@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Daniel Kiss <Daniel.Kiss@....com>,
        Denis Nikitin <denik@...omium.org>,
        Al Grant <al.grant@....com>, coresight@...ts.linaro.org,
        linux-arm-kernel@...ts.infradead.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 4/8] perf cs-etm: Fix bitmap for option

On Mon, Feb 08, 2021 at 01:46:41PM -0700, Mathieu Poirier wrote:
> On Sat, Feb 06, 2021 at 11:08:29PM +0800, Leo Yan wrote:
> > From: Suzuki K Poulose <suzuki.poulose@....com>
> > 
> > When set option with macros ETM_OPT_CTXTID and ETM_OPT_TS, it wrongly
> > takes these two values (14 and 28 prespectively) as bit masks, but
> > actually both are the offset for bits.  But this doesn't lead to
> > further failure due to the AND logic operation will be always true for
> > ETM_OPT_CTXTID / ETM_OPT_TS.
> > 
> > This patch defines new independent macros (rather than using the
> > "config" bits) for requesting the "contextid" and "timestamp" for
> > cs_etm_set_option().
> > 
> > [leoy: Extract the change as a separate patch for easier review]
> 
> This should go just above your name - see below.
> 
> > Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
> > Signed-off-by: Leo Yan <leo.yan@...aro.org>
> > Reviewed-by: Mike Leach <mike.leach@...aro.org>
> 
>  Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
>  [Extract the change as a separate patch for easier review]
>  Signed-off-by: Leo Yan <leo.yan@...aro.org>
>  Reviewed-by: Mike Leach <mike.leach@...aro.org>
> 
> > ---
> >  tools/perf/arch/arm/util/cs-etm.c | 12 ++++++++----
> >  1 file changed, 8 insertions(+), 4 deletions(-)
> > 
> > diff --git a/tools/perf/arch/arm/util/cs-etm.c b/tools/perf/arch/arm/util/cs-etm.c
> > index bd446aba64f7..c25c878fd06c 100644
> > --- a/tools/perf/arch/arm/util/cs-etm.c
> > +++ b/tools/perf/arch/arm/util/cs-etm.c
> > @@ -156,6 +156,10 @@ static int cs_etm_set_timestamp(struct auxtrace_record *itr,
> >  	return err;
> >  }
> >  
> > +#define ETM_SET_OPT_CTXTID	(1 << 0)
> > +#define ETM_SET_OPT_TS		(1 << 1)
> > +#define ETM_SET_OPT_MASK	(ETM_SET_OPT_CTXTID | ETM_SET_OPT_TS)
> > +
> 
> I would much rather see this fixed with the BIT() macro as it is done in the
> rest of this set than defining new constant.
> 
> With the above:
> 
> Reviewed-by: Mathieu Poirier <mathieu.poirier@...aro.org>
> 
> I have picked up the kernel portion of this set.  I suggest you fix the above
> and send another revision to Arnaldo with my RBs.

Will do this.  Thanks for suggestion, Mathieu.

Leo

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