netdev - Re: [patch 1/4] drivers/atm/firestream.c: suppress uninitialized var warning

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Date:	Fri, 28 Mar 2008 17:11:28 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org, chas@....nrl.navy.mil, jeff@...zik.org
Subject: Re: [patch 1/4] drivers/atm/firestream.c: suppress uninitialized
 var warning

On Fri, 28 Mar 2008 16:58:12 -0700 (PDT) David Miller <davem@...emloft.net> wrote:

> From: Andrew Morton <akpm@...ux-foundation.org>
> Date: Fri, 28 Mar 2008 16:54:37 -0700
> 
> > > diff --git a/drivers/atm/firestream.c b/drivers/atm/firestream.c
> > > index 47c57a4..98099f5 100644
> > > --- a/drivers/atm/firestream.c
> > > +++ b/drivers/atm/firestream.c
> > > @@ -978,6 +978,7 @@ static int fs_open(struct atm_vcc *atm_vcc)
> > >  		/* Docs are vague about this atm_hdr field. By the way, the FS
> > >  		 * chip makes odd errors if lower bits are set.... -- REW */
> > >  		tc->atm_hdr =  (vpi << 20) | (vci << 4); 
> > > +		tmc0 = 0;
> > >  		{
> > >  			int pcr = atm_pcr_goal (txtp);
> > 
> > Whereas the reader doesn't know why that unneeded initialisation is there.
> 
> git show $(git blame drivers/atm/firestream.c | grep "tmc0 = 0" | \
> 	   awk ' { print $1 } ')

Not practical.  By this argument we wouldn't need code comments at all.

Plus the bit from my earlier email which you snipped.

Plus uninitialized_var() gives us something to grep for and experiment with
if/when future gcc's get smarter.
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