Re: [PATCH] stop gcc warning about uninitialized 'dev' inata_scsi_scan_host

From: Adrian Bunk
Date: Thu Oct 16 2008 - 02:19:44 EST

On Wed, Oct 15, 2008 at 09:40:42PM -0600, Alex Chiang wrote:
> * Tejun Heo <tj@xxxxxxxxxx>:
> > 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@xxxxxx>
> >
> > Nacked-by: Tejun Heo <tj@xxxxxxxxxx>
> >
> > 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



"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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