linux-kernel - Re: [PATCH -tip] Documentation/accounting/getdelays.c intialize the variable before using it

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Date:	Wed, 27 May 2009 12:33:26 +0530
From:	Jaswinder Singh Rajput <jaswinder@...nel.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Balbir Singh <balbir@...ibm.com>,
	Randy Dunlap <randy.dunlap@...cle.com>,
	x86 maintainers <x86@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	James Bottomley <James.Bottomley@...senPartnership.com>
Subject: Re: [PATCH -tip] Documentation/accounting/getdelays.c intialize
 the variable before using it

On Tue, 2009-05-26 at 23:54 -0700, Andrew Morton wrote:
> On Wed, 20 May 2009 10:44:44 +0530 Jaswinder Singh Rajput <jaswinder@...nel.org> wrote:
> 
> > 
> > May be in some cases cmd_type will be used uninitialized.
> > 
> > Also fixes compilation warning:
> > 
> >    CC [M]  Documentation/DocBook/procfs_example.o
> >   Documentation/accounting/getdelays.c: In function ___main___:
> >   Documentation/accounting/getdelays.c:249: warning: ___cmd_type___ may be used uninitialized in this function
> > 
> > Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@...il.com>
> > ---
> >  Documentation/accounting/getdelays.c |    2 +-
> >  1 files changed, 1 insertions(+), 1 deletions(-)
> > 
> > diff --git a/Documentation/accounting/getdelays.c b/Documentation/accounting/getdelays.c
> > index 7ea2311..36aae3b 100644
> > --- a/Documentation/accounting/getdelays.c
> > +++ b/Documentation/accounting/getdelays.c
> > @@ -246,7 +246,7 @@ void print_ioacct(struct taskstats *t)
> >  
> >  int main(int argc, char *argv[])
> >  {
> > -	int c, rc, rep_len, aggr_len, len2, cmd_type;
> > +	int c, rc, rep_len, aggr_len, len2, cmd_type = TASKSTATS_CMD_ATTR_UNSPEC;
> >  	__u16 id;
> >  	__u32 mypid;
> >  
> 
> >From my reading of the code there is no bug here - we'll only use
> cmd_type if tid != 0, and cmd_type is always initialised when tid != 0.
> 
> But I suppose we should squish the warning anyway.
> 
> btw, whichever version of gcc you're using has apparently regressed -
> my gcc-4.3.0 manages to work out what's happening.  Hence please prefer
> to include the gcc version in the changelog.  And send a bug report at
> the gcc guys if appropriate ;)

my gcc version is 4.3.2 20081105 (Red Hat 4.3.2-7) (GCC)

But I heard from jejb that 4.3.3 fixed some of these warnings.

Thanks,
--
JSR

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