linux-kernel - Re: [PATCH V6 2/3] perf tools: parse the pmu event prefix and surfix

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Date:	Fri, 3 Oct 2014 10:23:51 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	"Liang, Kan" <kan.liang@...el.com>
Cc:	"acme@...nel.org" <acme@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"ak@...ux.intel.com" <ak@...ux.intel.com>,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH V6 2/3] perf tools: parse the pmu event prefix and surfix

On Thu, Oct 02, 2014 at 05:33:07PM +0000, Liang, Kan wrote:
> 
> 
> > >
> > > +static int
> > > +comp_pmu(const void *p1, const void *p2) {
> > > +	struct perf_pmu_event_symbol *pmu1 =
> > > +			(struct perf_pmu_event_symbol *) p1;
> > > +	struct perf_pmu_event_symbol *pmu2 =
> > > +			(struct perf_pmu_event_symbol *) p2;
> > 
> > please keep it on one line, like:
> > 	const struct perf_pmu_event_symbol *pmu1 = p1;
> > 	const struct perf_pmu_event_symbol *pmu2 = p2;
> > 
> 
> 
> Removing (struct perf_pmu_event_symbol *) will cause compiler error as below.
> 
> util/parse-events.c:877:39: error: initialization discards âconstâ qualifier from pointer target type [-Werror]
>   struct perf_pmu_event_symbol *pmu1 = p1;
> 
> If we keep (struct perf_pmu_event_symbol *), we may not keep it on one line. The line will over 80 characters. There will be error from checkpatch.pl.
> 
> 
> > > +	perf_pmu_events_list =
> > > +		malloc(sizeof(struct perf_pmu_event_symbol) * len);
> > 
> > please keep above on one line
> 
> If so, the line will over 80 characters. There will be error from checkpatch.pl.

AFAIK we are not that strict on this warning.. I think the current
notion is to keep the code easy to read with reasonable breakages
of this rule

jirka
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