linux-kernel - Re: [PATCH v2 3/6] compiler_types.h: don't #define _

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Message-ID: <d13a9088-e17a-0bae-9bf3-5ea334c18aa1@rasmusvillemoes.dk>
Date:   Thu, 5 Sep 2019 11:45:41 +0200
From:   Rasmus Villemoes <linux@...musvillemoes.dk>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        "H. Peter Anvin" <hpa@...or.com>, Nadav Amit <namit@...are.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
Subject: Re: [PATCH v2 3/6] compiler_types.h: don't #define __inline

On 05/09/2019 02.13, Nick Desaulniers wrote:
> On Fri, Aug 30, 2019 at 4:15 PM Rasmus Villemoes
> <linux@...musvillemoes.dk> wrote:
>>
> 
> Besides patch 1 and 2 of this series, I also see:
> Documentation/trace/tracepoint-analysis.rst
> 318:         :      extern __inline void
> __attribute__((__gnu_inline__, __always_inline__, _
> 

That seems to be copy-pasted output from some command, so I won't edit that.

> scripts/kernel-doc
> 1574:    $prototype =~ s/^__inline +//;

That one can indeed go once all uses of __inline in the source code is gone.

>> The exception is include/acpi/platform/acintel.h. However, that header
>> is only included when using the intel compiler (does anybody actually
>> build the kernel with that?), and the ACPI_INLINE macro is only used
> 
> In my effort to make the kernel slightly more compiler-portable, I
> have not yet found anyone building with ICC.  I would love to be
> proven wrong.  Let me go ask some of my Intel friends.

Yeah, the whole compiler-attributes.h only deal with gcc and clang, and
a lot of the attributes are unconditionally defined, so I assume either
ICC implements them all, or perhaps simply ignores (unknown) attributes?
It would be lovely if we could just throw out all the icc stuff.

>> in the definition of utterly trivial stub functions, where I doubt a
> 
> See:
> include/acpi/platform/acenv.h
> 146 #elif defined(__INTEL_COMPILER)
> 147 #include <acpi/platform/acintel.h>
> 
>> small change of semantics (lack of __gnu_inline) changes anything.
> 
> include/acpi/platform/acintel.h
> 25:#define ACPI_INLINE                 __inline
> include/acpi/platform/acgcc.h
> 29:#define ACPI_INLINE             __inline__
> 
> lol wut
> 
> I mean, you just would have to change that one line in
> include/acpi/platform/acintel.h, right?  I'd sign off on this patch
> with such a patch added to the series.

I'm not sure what you mean. Just switch the above __inline to inline?
It's annoying not being able to test it.

Rasmus