linux-kernel - Re: [bug] ata subsystem related crash with latest -git

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Message-ID: <20071017191743.GA15870@elte.hu>
Date:	Wed, 17 Oct 2007 21:17:43 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Jens Axboe <jens.axboe@...cle.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, Jeff Garzik <jgarzik@...ox.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: [bug] ata subsystem related crash with latest -git


* Ingo Molnar <mingo@...e.hu> wrote:

> > > drivers/scsi/scsi_lib.c:708: warning: 'index' may be used uninitialized in this function
> > > drivers/scsi/scsi_lib.c:708: note: 'index' was declared here
> > > 
> > > not sure it matters.
> > 
> > Hmm, I don't see them here (gcc 4.2.1). Must be the BUG(), does it go 
> > away if you add a index = -1 in the default: case? Just to be 
> > absolutely sure...
> 
> well if i initialize the variable then of course the warning goes away
> :)
> 
> NOTE: i get the same warning even without the BUG_ON() patch, and 
> without your other fix patch as well. I'm using gcc 4.2.2. (Do you get 
> the warning if you pick up the config i sent you earlier today?)

btw., i changed the initialization to -1 and the crash still occurs 
(as expected).

	Ingo
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