RE: [PATCH] asm-generic/io.h: Silence -Wnull-pointer-arithmetic warning on PCI_IOBASE

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From: Arnd Bergmann
> Sent: 13 April 2021 13:58
...
> The remaining ones (csky, m68k, sparc32) need to be inspected
> manually to see if they currently support PCI I/O space but in
> fact use address zero as the base (with large resources) or they
> should also turn the operations into a NOP.

I'd expect sparc32 to use an ASI to access PCI IO space.
I can't quite remember whether IO space was supported at all.

	David

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