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

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Date:   Thu, 18 Nov 2021 13:24:01 +0800
From:   Leo Yan <leo.yan@...aro.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.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

On Wed, Nov 17, 2021 at 12:35:46PM -0300, Arnaldo Carvalho de Melo wrote:

[...]

> > 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
> 
> ?

If AUXTRACE is disabled, then it has no chance to build cs-etm code;
this is decided by util/Build:

ifdef CONFIG_LIBOPENCSD
perf-$(CONFIG_AUXTRACE) += cs-etm.o
perf-$(CONFIG_AUXTRACE) += cs-etm-decoder/
endif

So we could safely remove the redundant definition for
COMPAT_NEED_REALLOCARRAY in CORESIGHT chunk.

Thanks,
Leo

> > 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)