linux-kernel - Re: [FYI][PATCH 1/1] perf tools: Set COMPAT_NEED_REALLOCARRAY for CONFIG

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Message-ID: <YZUhUjuqzwhoqQM/@kernel.org>
Date:   Wed, 17 Nov 2021 12:35:46 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Leo Yan <leo.yan@...aro.org>
Cc:     German Gomez <german.gomez@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        James Clark <james.clark@....com>,
        Jiri Olsa <jolsa@...hat.com>,
        John Garry <john.garry@...wei.com>,
        Mark Rutland <mark.rutland@....com>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Will Deacon <will@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [FYI][PATCH 1/1] perf tools: Set COMPAT_NEED_REALLOCARRAY for
 CONFIG_AUXTRACE=1

Em Wed, Nov 17, 2021 at 10:41:10PM +0800, Leo Yan escreveu:
> On Wed, Nov 17, 2021 at 09:51:42AM -0300, Arnaldo Carvalho de Melo wrote:
> > As it is being used in tools/perf/arch/arm64/util/arm-spe.c and the
> > COMPAT_NEED_REALLOCARRAY was only being set when CORESIGHT=1 is set.
> 
> Thanks for the patch, Arnaldo.
> 
> This patch looks good to me.  But I cannot reproduce the build failure,
> if without CORESIGHT=1 I still don't see the build failure.

Strange, here it broke when building on ubuntu:16.04-x-arm64 and ubuntu:18.04-x-arm64
I.e. cross building from x86-64 to arm64.
 
> I think we should apply below code as well, if COMPAT_NEED_REALLOCARRAY
> is enabled for AUXTRACE, it will be applied for cs-etm as well.  For
> this reason, we can remove the redundant definition for CORESIGHT.

Isn't it possible to ask for:

	make NO_AUXTRACE=1 CORESIGHT=1

?
 
> diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config
> index 07e65a061fd3..2dbf086d1155 100644
> --- a/tools/perf/Makefile.config
> +++ b/tools/perf/Makefile.config
> @@ -477,9 +477,6 @@ ifdef CORESIGHT
>    $(call feature_check,libopencsd)
>    ifeq ($(feature-libopencsd), 1)
>      CFLAGS += -DHAVE_CSTRACE_SUPPORT $(LIBOPENCSD_CFLAGS)
> -    ifeq ($(feature-reallocarray), 0)
> -      CFLAGS += -DCOMPAT_NEED_REALLOCARRAY
> -    endif
>      LDFLAGS += $(LIBOPENCSD_LDFLAGS)
>      EXTLIBS += $(OPENCSDLIBS)
>      $(call detected,CONFIG_LIBOPENCSD)
> 
> Thanks,
> Leo
> 
> > Fixes: 56c31cdff7c2a640 ("perf arm-spe: Implement find_snapshot callback")
> > Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
> > Cc: German Gomez <german.gomez@....com>
> > Cc: James Clark <james.clark@....com>
> > Cc: Jiri Olsa <jolsa@...hat.com>
> > Cc: John Garry <john.garry@...wei.com>
> > Cc: Leo Yan <leo.yan@...aro.org>
> > Cc: Mark Rutland <mark.rutland@....com>
> > Cc: Mathieu Poirier <mathieu.poirier@...aro.org>
> > Cc: Namhyung Kim <namhyung@...nel.org>
> > Cc: Will Deacon <will@...nel.org>
> > Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
> > ---
> >  tools/perf/Makefile.config | 3 +++
> >  1 file changed, 3 insertions(+)
> > 
> > diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config
> > index 07e65a061fd3a13b..afd144725a0bf766 100644
> > --- a/tools/perf/Makefile.config
> > +++ b/tools/perf/Makefile.config
> > @@ -1010,6 +1010,9 @@ ifndef NO_AUXTRACE
> >    ifndef NO_AUXTRACE
> >      $(call detected,CONFIG_AUXTRACE)
> >      CFLAGS += -DHAVE_AUXTRACE_SUPPORT
> > +    ifeq ($(feature-reallocarray), 0)
> > +      CFLAGS += -DCOMPAT_NEED_REALLOCARRAY
> > +    endif
> >    endif
> >  endif
> >  
> > -- 
> > 2.31.1
> > 

-- 

- Arnaldo