linux-kernel - Re: [PATCH 1/3] perf: Add capability-related utilities

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Message-ID: <20190717210551.GI3624@kernel.org>
Date:   Wed, 17 Jul 2019 18:05:51 -0300
From:   Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Igor Lubashev <ilubashe@...mai.com>, linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        linux-arm-kernel@...ts.infradead.org,
        James Morris <jmorris@...ei.org>
Subject: Re: [PATCH 1/3] perf: Add capability-related utilities

Em Tue, Jul 16, 2019 at 10:46:43AM +0200, Jiri Olsa escreveu:
> On Tue, Jul 02, 2019 at 08:10:03PM -0400, Igor Lubashev wrote:
> > Add utilities to help checking capabilities of the running process.
> > Make perf link with libcap.
> > 
> > Signed-off-by: Igor Lubashev <ilubashe@...mai.com>
> > ---
> >  tools/perf/Makefile.config         |  2 +-
> >  tools/perf/util/Build              |  1 +
> >  tools/perf/util/cap.c              | 24 ++++++++++++++++++++++++
> >  tools/perf/util/cap.h              | 10 ++++++++++
> >  tools/perf/util/event.h            |  1 +
> >  tools/perf/util/python-ext-sources |  1 +
> >  tools/perf/util/util.c             |  9 +++++++++
> >  7 files changed, 47 insertions(+), 1 deletion(-)
> >  create mode 100644 tools/perf/util/cap.c
> >  create mode 100644 tools/perf/util/cap.h
> > 
> > diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config
> > index 85fbcd265351..21470a50ed39 100644
> > --- a/tools/perf/Makefile.config
> > +++ b/tools/perf/Makefile.config
> > @@ -259,7 +259,7 @@ CXXFLAGS += -Wno-strict-aliasing
> >  # adding assembler files missing the .GNU-stack linker note.
> >  LDFLAGS += -Wl,-z,noexecstack
> >  
> > -EXTLIBS = -lpthread -lrt -lm -ldl
> > +EXTLIBS = -lpthread -lrt -lm -ldl -lcap
> 
> I wonder we should detect libcap or it's everywhere.. Arnaldo's compile test suite might tell

I'll add this tentatively and try to build it in my test suite.

- Arnaldo