linux-kernel - Re: [PATCH 09/12] perf diff: Add weighted diff computation way to compare hist entries

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Date:	Fri, 7 Sep 2012 11:28:31 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	linux-kernel@...r.kernel.org,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...e.hu>, Paul Mackerras <paulus@...ba.org>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Andi Kleen <andi@...stfloor.org>,
	David Ahern <dsahern@...il.com>
Subject: Re: [PATCH 09/12] perf diff: Add weighted diff computation way to
 compare hist entries

On Fri, Sep 07, 2012 at 02:58:19PM +0900, Namhyung Kim wrote:
> On Thu,  6 Sep 2012 17:47:03 +0200, Jiri Olsa wrote:
> > Adding 'wdiff' as new computation way to compare hist entries.

SNIP

> > +static int setup_compute_opt_wdiff(char *opt)
> > +{
> > +	char *w1_str = opt;
> > +	char *w2_str;
> > +
> > +	int ret = -EINVAL;
> > +
> > +	do {
> > +		if (!opt)
> > +			break;
> > +
> > +		w2_str = strchr(opt, ',');
> > +		if (!w2_str)
> > +			break;
> > +
> > +		*w2_str++ = 0x0;
> > +		if (!*w2_str)
> > +			break;
> > +
> > +		compute_wdiff_w1 = strtol(w1_str, NULL, 10);
> > +		compute_wdiff_w2 = strtol(w2_str, NULL, 10);
> > +
> > +		if (!compute_wdiff_w1 || !compute_wdiff_w2)
> > +			break;
> > +
> > +		pr_debug("compute wdiff w1(%" PRId64 ") w2(%" PRId64 ")\n",
> > +			  compute_wdiff_w1, compute_wdiff_w2);
> > +		ret = 0;
> > +
> > +	} while (0);
> 
> I don't see why this do { } while(0) loop is necessary.
> How about this?
> 
> 	w1 = strtol(opt, &tmp, 10);
> 	if (*tmp != ',')
> 		goto error;
> 
> 	opt = tmp + 1;
> 	w2 = strtol(opt, &tmp, 10);
> 	if (*tmp != '\0')
> 		goto error;
> 
> 	if (!w1 || !w2)
> 		goto error;

I do this not to use labels & goto ;)

jirka
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