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

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Date:	Mon, 30 Jan 2012 18:18:19 +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 03:51:46PM +0000, Arnd Bergmann wrote:
> On Monday 30 January 2012, Michael S. Tsirkin wrote:
> > --- a/include/asm-generic/pci_iomap.h
> > +++ b/include/asm-generic/pci_iomap.h
> > @@ -15,6 +15,11 @@ struct pci_dev;
> >  #ifdef CONFIG_PCI
> >  /* Create a virtual mapping cookie for a PCI BAR (memory or IO) */
> >  extern void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long max);
> > +/* 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. */
> > +extern void __iomem *__pci_ioport_map(struct pci_dev *dev, unsigned long port,
> > +                                     unsigned int nr);
> >  #else
> >  static inline void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long max)
> >  {
> > index 4b0fdc2..1dfda29 100644
> > --- a/lib/pci_iomap.c
> > +++ b/lib/pci_iomap.c
> > @@ -9,6 +9,16 @@
> >  #include <linux/export.h>
> >  
> >  #ifdef CONFIG_PCI
> > +#ifndef CONFIG_NO_GENERIC_PCI_IOPORT_MAP
> > +/* Architectures can override ioport mapping while
> > + * still using the rest of the generic infrastructure. */
> > +void __iomem *__pci_ioport_map(struct pci_dev *dev,
> > +                              unsigned long port,
> > +                              unsigned int nr)
> > +{
> > +       return ioport_map(port, nr);
> > +}
> > +#endif
> >  /**
> >   * pci_iomap - create a virtual mapping cookie for a PCI BAR
> >   * @dev: PCI device that owns the BAR
> 
> This looks correct, but it would be nicer to express this with an inline
> function and keeping the new #ifdef to the header file, like
> 
> +/*
> + * 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.

Worth it?

-- 
MST
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