Re: [PATCH 02/11] atyfb_base compile fix for CONFIG_PCI=n

[Roman Zippel]

Hi,

On Wed, 24 May 2006, Greg KH wrote:

> > >  Index: linux-2.6-mm/drivers/video/aty/atyfb_base.c
> > >  ===================================================================
> > >  --- linux-2.6-mm.orig/drivers/video/aty/atyfb_base.c
> > >  +++ linux-2.6-mm/drivers/video/aty/atyfb_base.c
> > >  @@ -3861,7 +3861,9 @@ static int __init atyfb_init(void)
> > >       atyfb_setup(option);
> > >   #endif
> > >   
> > >  +#ifdef CONFIG_PCI
> > >       pci_register_driver(&atyfb_driver);
> > >  +#endif
> > >   #ifdef CONFIG_ATARI
> > >       atyfb_atari_probe();
> > >   #endif
> > >  @@ -3870,7 +3872,9 @@ static int __init atyfb_init(void)
> > >   
> > >   static void __exit atyfb_exit(void)
> > >   {
> > >  +#ifdef CONFIG_PCI
> > >   	pci_unregister_driver(&atyfb_driver);
> > >  +#endif
> > >   }
> > 
> > bah.  If pci_register_driver() was a macro we wouldn't need to do this all
> > over the place.
> 
> Yes, this can be fixed easily in the pci.h header file, all other pci
> functions are stubbed out properly if CONFIG_PCI is not enabled.  These
> should be too.

I'm not a big fan of such dummy macros, as these macros should properly 
look like:

#define pci_register_driver(x)	({ (void)(x); 0; })

otherwise you risk warnings about defined but unused variables.

The other alternative is to remove the #ifdef around atyfb_driver, recent 
gcc (>= 4.0) can remove the unused structure.

bye, Roman
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