linux-kernel - Re: [PATCH] perf tools: Shut up compiler warning

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Message-Id: <1256044759.2669.0.camel@localhost.localdomain>
Date:	Tue, 20 Oct 2009 09:19:19 -0400
From:	Steven Rostedt <srostedt@...hat.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Arnaldo Carvalho de Melo <acme@...hat.com>,
	linux-kernel@...r.kernel.org,
	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>
Subject: Re: [PATCH] perf tools: Shut up compiler warning

On Tue, 2009-10-20 at 07:54 +0200, Ingo Molnar wrote:
> * Arnaldo Carvalho de Melo <acme@...hat.com> wrote:
> 
> > cc1: warnings being treated as errors
> > util/trace-event-parse.c: In function ‘parse_ftrace_printk’:
> > util/trace-event-parse.c:289: warning: ‘fmt’ may be used uninitialized in this function
> > 
> > Cc: Steven Rostedt <srostedt@...hat.com>
> > Cc: Peter Zijlstra <peterz@...radead.org>
> > Cc: Frederic Weisbecker <fweisbec@...il.com>
> > Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
> > ---
> >  tools/perf/util/trace-event-parse.c |    2 +-
> >  1 files changed, 1 insertions(+), 1 deletions(-)
> > 
> > diff --git a/tools/perf/util/trace-event-parse.c b/tools/perf/util/trace-event-parse.c
> > index 4b61b49..0b8a01b 100644
> > --- a/tools/perf/util/trace-event-parse.c
> > +++ b/tools/perf/util/trace-event-parse.c
> > @@ -286,7 +286,7 @@ void parse_ftrace_printk(char *file, unsigned int size __unused)
> >  	char *line;
> >  	char *next = NULL;
> >  	char *addr_str;
> > -	char *fmt;
> > +	char *fmt = NULL;
> >  	int i;
> >  
> >  	line = strtok_r(file, "\n", &next);
> 
> Actually, this might be a real bug that GCC pointed out: what makes sure 
> that strtok_r() does not return a NULL (no more tokens) and hence fmt 
> remains NULL (crashing the rest of the parser)?

Ug, yeah that's a bug. That was one of the later changes I did at night.
I'll go look at it and see how it should really be.

Thanks,

-- Steve


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