linux-kernel - Re: [PATCH v2 1/2] powerpc/io: Avoid clang null pointer arithmetic warnings

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Message-Id: <171517558549.165093.14013162517942082900.b4-ty@ellerman.id.au>
Date: Wed, 08 May 2024 23:39:45 +1000
From: Michael Ellerman <patch-notifications@...erman.id.au>
To: linuxppc-dev@...ts.ozlabs.org, Michael Ellerman <mpe@...erman.id.au>
Cc: arnd@...db.de, naresh.kamboju@...aro.org, linux-kernel@...r.kernel.org, nathan@...nel.org
Subject: Re: [PATCH v2 1/2] powerpc/io: Avoid clang null pointer arithmetic warnings

On Fri, 03 May 2024 17:56:18 +1000, Michael Ellerman wrote:
> With -Wextra clang warns about pointer arithmetic using a null pointer.
> When building with CONFIG_PCI=n, that triggers a warning in the IO
> accessors, eg:
> 
>   In file included from linux/arch/powerpc/include/asm/io.h:672:
>   linux/arch/powerpc/include/asm/io-defs.h:23:1: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
>      23 | DEF_PCI_AC_RET(inb, u8, (unsigned long port), (port), pio, port)
>         | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>   ...
>   linux/arch/powerpc/include/asm/io.h:591:53: note: expanded from macro '__do_inb'
>     591 | #define __do_inb(port)          readb((PCI_IO_ADDR)_IO_BASE + port);
>         |                                       ~~~~~~~~~~~~~~~~~~~~~ ^
> 
> [...]

Applied to powerpc/next.

[1/2] powerpc/io: Avoid clang null pointer arithmetic warnings
      https://git.kernel.org/powerpc/c/03c0f2c2b2220fc9cf8785cd7b61d3e71e24a366
[2/2] powerpc/64: Set _IO_BASE to POISON_POINTER_DELTA not 0 for CONFIG_PCI=n
      https://git.kernel.org/powerpc/c/be140f1732b523947425aaafbe2e37b41b622d96

cheers