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

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Message-ID: <20120131211853.GC6843@redhat.com>
Date:	Tue, 31 Jan 2012 23:18:54 +0200
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Arnd Bergmann <arnd@...db.de>
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 Mon, Jan 30, 2012 at 08:04:32PM +0000, Arnd Bergmann wrote:
> 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

OK, I did exactly that. Thanks!
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