linux-kernel - Re: [PATCH 09/11] perf tools: Propagate error info for the tracepoint parsing

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Message-ID: <20150828132052.GF2759@codeblueprint.co.uk>
Date:	Fri, 28 Aug 2015 14:20:52 +0100
From:	Matt Fleming <matt@...eblueprint.co.uk>
To:	Jiri Olsa <jolsa@...nel.org>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	lkml <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Raphaël Beamonte <raphael.beamonte@...il.com>
Subject: Re: [PATCH 09/11] perf tools: Propagate error info for the
 tracepoint parsing

On Wed, 26 Aug, at 03:46:51PM, Jiri Olsa wrote:
> Pass 'struct parse_events_error *error' to the parse-event.c
> tracepoint adding path. It will be filled with error data
> in following patches.
> 
> Link: http://lkml.kernel.org/n/tip-las1hm5zf58b0twd27h9895b@git.kernel.org
> Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> ---
>  tools/perf/util/parse-events.c | 27 ++++++++++++++++-----------
>  tools/perf/util/parse-events.h |  3 ++-
>  tools/perf/util/parse-events.y |  4 ++--
>  3 files changed, 20 insertions(+), 14 deletions(-)

Is there a reason you decided to go ahead with passing 'data->error'
directly to the parsing functions instead of adding some global state
for recording errors, like a globally accessible 'parse_events_error'?

Because I notice that if someone wanted to improve the breakpoint
parsing code, they'd basically need to make the same changes you've
made in this patch.

-- 
Matt Fleming, Intel Open Source Technology Center
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