linux-kernel - Re: [PATCH] perf tools: fix bug in usage of the basename() function

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Message-ID: <20131210123411.GA31129@gmail.com>
Date:	Tue, 10 Dec 2013 13:34:11 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	"mingo@...e.hu" <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	Jiri Olsa <jolsa@...hat.com>, Ben Cheng <bccheng@...gle.com>,
	David Ahern <dsahern@...il.com>
Subject: Re: [PATCH] perf tools: fix bug in usage of the basename() function


* Stephane Eranian <eranian@...gle.com> wrote:

> >> +     base = strdup(basename(lname));
> >> +
> >> +     free(lname);
> >> +
> >> +     if (!base)
> >> +             return;
> >> +
> >> +     if (dso->sname_alloc)
> >> +             free((char *)dso->short_name);
> >
> > That cast is probably not needed.
> >
> It is with my compiler. It prints out a warning otherwise.

Yeah, see my previous mail, I think having dso->short_name as 'const' 
is a mistake, as there are really just two main usecases for methods 
that operate on 'struct dso':

 - life time affecting (setup/free) methods which need access to all
   fields, which don't want dso->short_name as a const (as evidenced
   by the cast).

 - actual usage methods that get a 'const struct dso' anyway, so they
   don't need dso->short_name as a const.

Thanks,

	Ingo
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