Re: [PATCH 5/6] mips: drop GENERIC_IOMAP wrapper

On Tue, Mar 18, 2025 at 10:13:35PM +0100, Arnd Bergmann wrote:
> Thanks for the report, I missed that the generic ioport_map() function
> is missing the PCI_IOBASE macro, we should probably remove that from
> the asm-generic/io.h header and require architectures to define it
> themselves, since the NULL fallback is pretty much always wrong.
> 
> There is also a type mismatch between the MIPS
> PCI_IOBASE/mips_io_port_base and the one that asm-generic/io.h
> expects, so I had to add a couple of extra typecasts, which
> makes it rather ugly, but the change below seems to work.

Thanks, that does make the -Wnull-pointer-arithmetic warnings disappear.
That build still fails in next-20250319 (which includes that change) at
the end with:

  $ make -skj"$(nproc)" ARCH=mips CROSS_COMPILE=mips-linux- mrproper malta_defconfig all
  ERROR: modpost: "pci_iounmap" [drivers/net/wireless/intel/ipw2x00/ipw2100.ko] undefined!

which appears related to this original change.

Cheers,
Nathan