linux-kernel - Re: [PATCH] include/linux/compiler*.h: Use feature checking instead of version checks for attributes

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Message-ID: <6c81222980f0f81732726b405df6dbf2b8f98844.camel@perches.com>
Date:   Sun, 26 Aug 2018 11:50:06 -0700
From:   Joe Perches <joe@...ches.com>
To:     Miguel Ojeda <miguel.ojeda.sandonis@...il.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Eli Friedman <efriedma@...eaurora.org>,
        Christopher Li <sparse@...isli.org>,
        Kees Cook <keescook@...omium.org>,
        Ingo Molnar <mingo@...nel.org>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Dominique Martinet <asmadeus@...ewreck.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] include/linux/compiler*.h: Use feature checking instead
 of version checks for attributes

On Sun, 2018-08-26 at 19:57 +0200, Miguel Ojeda wrote:
> Instead of using version checks per-compiler to define (or not) each attribute,
> use __has_attribute to test for them, following the cleanup started with
> commit 815f0ddb346c ("include/linux/compiler*.h: make compiler-*.h mutually exclusive").

Very nice.  Thank you Miguel.

trivia:

I believe the alphabetic sorting of the required attributes
makes reading by use a bit difficult and I would prefer that
various required attributes are sorted by logical use instead.

ie:  keep noinline and __always_inline together,
     keep __used and __always_unused together,
     etc...