linux-kernel - Re: [PATCH v2 2/2] Compiler Attributes: naked can be shared

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Message-ID: <20180918173428.GA21591@kroah.com>
Date:   Tue, 18 Sep 2018 19:34:28 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
Cc:     linux-kernel@...r.kernel.org,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        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>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Joe Perches <joe@...ches.com>,
        Dominique Martinet <asmadeus@...ewreck.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-sparse@...r.kernel.org
Subject: Re: [PATCH v2 2/2] Compiler Attributes: naked can be shared

On Tue, Sep 18, 2018 at 06:55:42PM +0200, Miguel Ojeda wrote:
> The naked attribute is supported by at least gcc >= 4.6 (for ARM,
> which is the only current user), gcc >= 8 (for x86), clang >= 3.1
> and icc >= 13. See https://godbolt.org/z/350Dyc
> 
> Therefore, move it out of compiler-gcc.h so that the definition
> is shared by all compilers.
> 
> This also fixes Clang support for ARM32 --- 815f0ddb346c
> ("include/linux/compiler*.h: make compiler-*.h mutually exclusive").

So, with this applied, does clang really build an arm32 kernel
successfully?  No other problem at all?  And this isn't really a
regression, arm32 never really worked with clang yet, right?

thanks,

greg k-h