linux-kernel - Re: [PATCH 1/3] lib: add NO_GENERIC_PCI_IOPORT

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Date:	Mon, 30 Jan 2012 20:04:32 +0000
From:	Arnd Bergmann <arnd@...db.de>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	Kevin Cernekee <cernekee@...il.com>,
	Ralf Baechle <ralf@...ux-mips.org>,
	Paul Mundt <lethal@...ux-sh.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Myron Stowe <myron.stowe@...hat.com>,
	Paul Gortmaker <paul.gortmaker@...driver.com>,
	Lucas De Marchi <lucas.demarchi@...fusion.mobi>,
	Dmitry Kasatkin <dmitry.kasatkin@...el.com>,
	James Morris <jmorris@...ei.org>,
	"John W. Linville" <linville@...driver.com>,
	Michael Witten <mfwitten@...il.com>, linux-mips@...ux-mips.org,
	linux-kernel@...r.kernel.org, linux-sh@...r.kernel.org,
	linux-arch@...r.kernel.org
Subject: Re: [PATCH 1/3] lib: add NO_GENERIC_PCI_IOPORT_MAP

On Monday 30 January 2012, Michael S. Tsirkin wrote:
> > 
> > +/*
> > + * Create a virtual mapping cookie for a port on a given PCI device.
> > + * Do not call this directly, it exists to make it easier for architectures
> > + * to override.
> > + */
> > +#ifdef CONFIG_NO_GENERIC_PCI_IOPORT_MAP
> > +extern void __iomem *__pci_ioport_map(struct pci_dev *dev, unsigned long port,
> > +                                     unsigned int nr);
> > +#else
> > +static inline void __iomem *__pci_ioport_map(struct pci_dev *dev,
> > +                              unsigned long port, unsigned int nr)
> > +{
> > +       return ioport_map(port, nr);
> > +}
> > +#endif
> > 
> >       Arnd
> 
> It would be nicer in that it would
> make the kernel a bit smaller for generic architectures
> but this would need to go into a separate header:
> it depends on io.h and io.h depends on pci_iomap.h.

Adding extra dependencies is not good here, I agree.
Maybe  a better solution is to use a macro instead of an inline
function then:

#define  __pci_ioport_map(dev, port, nr) ioport_map(port, nr)

In general, macros should be avoided, but I think it's the
best tradeoff in this case.

	Arnd
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