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

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Date:   Thu, 15 Apr 2021 14:36:58 +0200
From:   Niklas Schnelle <schnelle@...ux.ibm.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        clang-built-linux@...glegroups.com, linux-arch@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org
Subject: [PATCH v2 0/2] asm-generic/io.h: Silence -Wnull-pointer-arithmetic warning on PCI_IOBASE

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(-)

-- 
2.25.1