linux-kernel - Re: [PATCH] powerpc: drop port I/O helpers for CONFIG_HAS

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Date: Thu, 18 Apr 2024 23:01:25 +1000
From: Michael Ellerman <mpe@...erman.id.au>
To: Arnd Bergmann <arnd@...db.de>, Arnd Bergmann <arnd@...nel.org>
Cc: Naresh Kamboju <naresh.kamboju@...aro.org>,
 linux-kernel@...r.kernel.org, linuxppc-dev
 <linuxppc-dev@...ts.ozlabs.org>, "Aneesh Kumar K . V"
 <aneesh.kumar@...nel.org>, Anders Roxell <anders.roxell@...aro.org>, Kees
 Cook <keescook@...omium.org>, Niklas Schnelle <schnelle@...ux.ibm.com>,
 clang-built-linux <llvm@...ts.linux.dev>, Nick Desaulniers
 <ndesaulniers@...gle.com>, Nathan Chancellor <nathan@...nel.org>, Jeff Xu
 <jeffxu@...omium.org>, "Naveen N. Rao" <naveen.n.rao@...ux.ibm.com>, Dan
 Carpenter <dan.carpenter@...aro.org>, Nicholas Piggin <npiggin@...il.com>,
 Christophe Leroy <christophe.leroy@...roup.eu>, Bill Wendling
 <morbo@...gle.com>, Justin Stitt <justinstitt@...gle.com>, Baoquan He
 <bhe@...hat.com>, Mike Rapoport <rppt@...nel.org>
Subject: Re: [PATCH] powerpc: drop port I/O helpers for CONFIG_HAS_IOPORT=n

"Arnd Bergmann" <arnd@...db.de> writes:
> On Thu, Apr 18, 2024, at 08:26, Michael Ellerman wrote:
>> Arnd Bergmann <arnd@...nel.org> writes:
>
>> @@ -692,6 +692,7 @@ static inline void name at                          
>>         \
>>  #define writesw writesw
>>  #define writesl writesl
>>
>> +#ifdef CONFIG_HAS_IOPORT
>>  #define inb inb
>>  #define inw inw
>>  #define inl inl
>> @@ -704,6 +705,8 @@ static inline void name at                          
>>         \
>>  #define outsb outsb
>>  #define outsw outsw
>>  #define outsl outsl
>> +#endif // CONFIG_HAS_IOPORT
>> +
>>  #ifdef __powerpc64__
>>  #define readq  readq
>>  #define writeq writeq
>
> I had included this at first, but then I still ran into
> the same warnings because it ends up pulling in the
> generic outsb() etc from include/asm-generic/io.h
> that relies on setting a non-NULL PCI_IOBASE.

Yes you're right. The above fixes the gcc build, but not clang.

So I think I'll just cherry pick f0a816fb12da ("/dev/port: don't compile
file operations without CONFIG_DEVPORT") into my next and then apply
this. But will see if there's any other build failures over night.

cheers