Re: [Xen-devel] [PATCH] xen: remove incorrect forward declaration

From: Arnd Bergmann
Date: Fri May 27 2016 - 17:56:17 EST

On Thursday, May 26, 2016 11:32:40 AM CEST David Vrabel wrote:
> On 11/05/16 14:07, Arnd Bergmann wrote:
> > A bugfix patch for the xen balloon driver introduced a forward
> > declaration for a static function that is conditionally compiled,
> > causing a warning if only the declaration but not the definition
> > are there:
> >
> > drivers/xen/balloon.c:154:13: error: 'release_memory_resource' declared 'static' but never defined [-Werror=unused-function]
> > static void release_memory_resource(struct resource *resource);
> >
> > This removes the declaration again and instead moves the function
> > definition to the right place, before its first caller and inside
> > of the #ifdef protecting both.
> I've applied the equivalent patch from Ross, instead.

Ok, thanks.

> > The patch that introduced the warning is marked for stable
> > backports, so if that gets applied to 4.4, so should this one.
> Fixes for compiler warnings are not sufficiently important to be
> backported to stable.

Sure, but this is not an existing warning but one that only gets
introduced after the other patch gets backported, which I'd consider
a different category.