Re: [PATCH]dgrs - Fixes Warnings when CONFIG_ISA and CONFIG_PCI are not enabled

[Andrew Morton <akpm@osdl.org>]

Richard Knutsson <ricknu-0@student.ltu.se> wrote:
>
> > 	 */
>  > #ifdef CONFIG_EISA
>  >-	eisacount = eisa_driver_register(&dgrs_eisa_driver);
>  >-	if (eisacount < 0)
>  >-		return eisacount;
>  >-#endif
>  >-#ifdef CONFIG_PCI
>  >-	pcicount = pci_register_driver(&dgrs_pci_driver);
>  >-	if (pcicount)
>  >-		return pcicount;
>  >+	cardcount = eisa_driver_register(&dgrs_eisa_driver);
>  >+	if (cardcount < 0)
>  >+		return cardcount;
>  > #endif
>  >+	cardcount = pci_register_driver(&dgrs_pci_driver);
>  >+	if (cardcount)
>  >+		return cardcount;
>  > 	return 0;
>  > }
>  >  
>  >
>  I do not know what to think about this one:
>  * reduce one #ifdef: good
>  * check for something clearly stated not to: not so good

Well a nicer fix would be to provide a stub implementation of
eisa_driver_register() if !CONFIG_EISA, just like pci_register_driver(). 
Then all the ifdefs go away and the compiler removes all the code for us,
after checking that we typed it correctly.