linux-kernel - Re: [PATCH 2.6.19-rc3] i386/io_apic: fix compiler warning in create

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Date:	Tue, 31 Oct 2006 01:49:14 -0800
From:	Andrew Morton <akpm@...l.org>
To:	Ingo Molnar <mingo@...hat.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Stefan Richter <stefanr@...6.in-berlin.de>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2.6.19-rc3] i386/io_apic: fix compiler warning in
 create_irq

On Tue, 31 Oct 2006 10:37:37 +0100
Ingo Molnar <mingo@...hat.com> wrote:

> On Mon, 2006-10-30 at 17:04 -0800, Andrew Morton wrote:
> > > >     irq = -ENOSPC;
> > > > +   vector = 0;
> > > 
> > > NAK - the code is fine, and this is fixed in Jeff's gcc-warnings
> > tree 
> > > via annotation.
> > 
> > err, what gcc-warnings tree?
> > 
> > git
> > +ssh://master.kernel.org/pub/scm/linux/kernel/git/jgarzik/misc-2.6.git#gccbug
> > just does lots of initialise-to-zero thingies, doesn't have any
> > special
> > annotation and doesn't fix io_apic.c.
> 
> this is an initialize-to-zero annotation for a false-positive gcc
> warning. If it's not in Jeff tree yet then it should be there ...
> 

hm, I wouldn't call that "annotation".


Now, the

#define SHUT_GCC_UP(x)	= x

	...
	int foo SHUT_GCC_UP(foo);
	...

(or whatever it was) trick was "annotation".  A good way of doing it too, IMO.
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