[PATCH v2 0/2] asm-generic/io.h: Silence -Wnull-pointer-arithmetic warning on PCI_IOBASE

Niklas Schnelle
2021-04-15T12:37:10Z

Hi,

This is version 2 of my attempt to get rid of a clang -Wnull-pointer-arithmetic
warning for the use of PCI_IOBASE in asm-generic/io.h. This was originally
found on s390 but should apply to all platforms leaving PCI_IOBASE undefined
while making use of the inb() and friends helpers from asm-generic/io.h.

Thanks,
Niklas

Changes since v1:
- Added patch to explicitly set PCI_IOBASE to 0 on sparc as suggested by Arnd
Bergmann
- Instead of working around the warning with a uintptr_t PCI_IOBASE make inb()
and friends explicitly WARN_ONCE() and return 0xff... (Arnd)

Niklas Schnelle (2):
sparc: explicitly set PCI_IOBASE to 0
asm-generic/io.h: Silence -Wnull-pointer-arithmetic warning on
PCI_IOBASE

arch/sparc/include/asm/io.h | 4 +++
include/asm-generic/io.h | 55 ++++++++++++++++++++++++++++++++++---
2 files changed, 55 insertions(+), 4 deletions(-)

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2.25.1