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

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Date:   Tue, 16 Jul 2019 10:46:43 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Igor Lubashev <ilubashe@...mai.com>
Cc:     linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        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

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

jirka