Re: [PATCH] asm-generic: Support NO_IOPORT_MAP in pci_iomap.h

[Stafford Horne]

On Fri, Jul 29, 2022 at 12:04:49PM -0500, Bjorn Helgaas wrote:
> On Sat, Jul 23, 2022 at 06:22:48AM +0900, Stafford Horne wrote:
> > When building OpenRISC PCI which has no ioport_map we get the following build
> > error.
> > 
> >     lib/pci_iomap.c: In function 'pci_iomap_range':
> >       CC      drivers/i2c/i2c-core-base.o
> >     ./include/asm-generic/pci_iomap.h:29:41: error: implicit declaration of function 'ioport_map'; did you mean 'ioremap'? [-Werror=implicit-function-declaration]
> >        29 | #define __pci_ioport_map(dev, port, nr) ioport_map((port), (nr))
> >           |                                         ^~~~~~~~~~
> >     lib/pci_iomap.c:44:24: note: in expansion of macro '__pci_ioport_map'
> >        44 |                 return __pci_ioport_map(dev, start, len);
> >           |                        ^~~~~~~~~~~~~~~~
> > 
> > This patch adds a NULL definition of __pci_ioport_map for architetures
> > which do not support ioport_map.
> > 
> > Suggested-by: Arnd Bergmann <arnd@xxxxxxxx>
> > Signed-off-by: Stafford Horne <shorne@xxxxxxxxx>
> 
> Appended to my pci/header-cleanup-immutable branch for v5.20, thanks!

Thanks, I did have this in the PCI series on my OpenRISC fot-next branch.  I
will just rebase that on the pci/header-cleanup-immutable branch to avoid having
the patch there two times.

Also, your updated subject on the commit is much better.

-Stafford

> > ---
> > The Kconfig I am using to test this is here:
> >   https://github.com/stffrdhrn/linux/commits/or1k-virt-4
> > 
> >  include/asm-generic/pci_iomap.h | 2 ++
> >  1 file changed, 2 insertions(+)
> > 
> > diff --git a/include/asm-generic/pci_iomap.h b/include/asm-generic/pci_iomap.h
> > index 5a2f9bf53384..8fbb0a55545d 100644
> > --- a/include/asm-generic/pci_iomap.h
> > +++ b/include/asm-generic/pci_iomap.h
> > @@ -25,6 +25,8 @@ extern void pci_iounmap(struct pci_dev *dev, void __iomem *);
> >  #ifdef CONFIG_NO_GENERIC_PCI_IOPORT_MAP
> >  extern void __iomem *__pci_ioport_map(struct pci_dev *dev, unsigned long port,
> >  				      unsigned int nr);
> > +#elif !defined(CONFIG_HAS_IOPORT_MAP)
> > +#define __pci_ioport_map(dev, port, nr) NULL
> >  #else
> >  #define __pci_ioport_map(dev, port, nr) ioport_map((port), (nr))
> >  #endif
> > -- 
> > 2.36.1
> >