linux-kernel - Re: [PATCH] stop gcc warning about uninitialized 'dev' in ata_scsi_scan

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Message-ID: <20081016061638.GA23630@cs181140183.pp.htv.fi>
Date:	Thu, 16 Oct 2008 09:16:38 +0300
From:	Adrian Bunk <bunk@...nel.org>
To:	Alex Chiang <achiang@...com>, Tejun Heo <tj@...nel.org>,
	jeff@...hat.com, linux-ide@...r.kernel.org,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] stop gcc warning about uninitialized 'dev' in
	ata_scsi_scan_host

On Wed, Oct 15, 2008 at 09:40:42PM -0600, Alex Chiang wrote:
> * Tejun Heo <tj@...nel.org>:
> > Alex Chiang wrote:
> > > Shuts up gcc-3.4.5-glibc-2.3.6 when it complains of:
> > > 
> > > drivers/ata/libata-scsi.c: In function `ata_scsi_scan_host':
> > > drivers/ata/libata-scsi.c:3225: warning: 'dev' might be used
> > > uninitialized in this function
> > > 
> > > Signed-off-by: Alex Chiang <achiang@...com>
> > 
> > Nacked-by: Tejun Heo <tj@...nel.org>
> > 
> > Some gcc versions complain about sata_via, others complain
> > about something else.  Some versions complain about some
> > iterator usages while not complaining about others, but none of
> > those complaints is actually wrong or dangerous.  I don't think
> > adding = NULL whenever some version of gcc complains is the
> > right approach.
> 
> Hm, ok.
> 
> I guess we don't want to sprinkle these around all over the place
> just to solve cosmetic issues, which makes sense, but is there
> some other approach we could take instead? Any suggestions? Or
> just live with it?

We have an annotation for these kinds of warnings in the kernel.

But we'll never get a warning-free compilation with all seven (sic) 
supported gcc release series.

A warning-free compilation with gcc 4.3 is worth some efforts, but 
cluttering our code to fix bogus warnings with older gcc versions
is not a good thing.

> /ac

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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