linux-kernel - Re: [PATCH v2 1/4] perf tools: Create for_each

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Date:   Tue, 31 Jan 2017 12:32:14 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Taeung Song <treeze.taeung@...il.com>,
        linux-kernel@...r.kernel.org, Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Wang Nan <wangnan0@...wei.com>,
        Frederic Weisbecker <fweisbec@...il.com>
Subject: Re: [PATCH v2 1/4] perf tools: Create for_each_event macro for
 tracepoints iteration

On Tue, 31 Jan 2017 09:23:48 -0300
Arnaldo Carvalho de Melo <acme@...nel.org> wrote:

> Em Tue, Jan 31, 2017 at 09:21:16AM -0300, Arnaldo Carvalho de Melo escreveu:
> > Em Tue, Jan 31, 2017 at 08:38:28PM +0900, Taeung Song escreveu:  
> > > -	while ((dent = readdir(dir))) {
> > > -		if (dent->d_type != DT_DIR ||
> > > -		    strcmp(dent->d_name, ".") == 0 ||
> > > -		    strcmp(dent->d_name, "..") == 0 ||
> > > -		    strcmp(dent->d_name, "ftrace") == 0 ||
> > > +	for_each_event(dir, dent, tps) {
> > > +		if (!strcmp(dent->d_name, "ftrace") ||
> > >  		    !system_in_tp_list(dent->d_name, tps))
> > >  			continue;  
> 
> > the existing style was == 0, you switched it to !, equivalent, but
> > gratuitous, keeping the existing style would make reviewing slightly
> > faster, as the pattern wouldn't have changed.  
>  
> Here it is:
> 
> -       while ((dent = readdir(dir))) {
> -               if (dent->d_type != DT_DIR ||
> -                   strcmp(dent->d_name, ".") == 0 ||
> -                   strcmp(dent->d_name, "..") == 0 ||
> -                   strcmp(dent->d_name, "ftrace") == 0 ||
> +       for_each_event(dir, dent, tps) {
> +               if (strcmp(dent->d_name, "ftrace") == 0 ||
>                     !system_in_tp_list(dent->d_name, tps))
>                         continue;

Thanks, because I always screw up the !strcmp(). Thus I find the "== 0"
to me is easier to process "matches" and "!= 0" is "doesn't match".

-- Steve