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

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Message-ID: <20071017191456.GA14916@elte.hu>
Date:	Wed, 17 Oct 2007 21:14:56 +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


* Jens Axboe <jens.axboe@...cle.com> wrote:

> On Wed, Oct 17 2007, Ingo Molnar wrote:
> > 
> > btw., i get the following build warning:
> > 
> > drivers/scsi/scsi_lib.c: In function 'scsi_free_sgtable':
> > 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
> > 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
> > drivers/scsi/scsi_lib.c: In function 'scsi_alloc_sgtable':
> > 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?)

	Ingo
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