linux-kernel - Re: Issue with BUG() in asm-gemeric/bug.h if CONFIG

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Message-ID: <CAMuHMdXkb6BH=1QvfHwMN54db9mP64KnCgoAj3aXida7-6OtPA@mail.gmail.com>
Date:	Mon, 30 Sep 2013 21:03:28 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	David Daney <ddaney.cavm@...il.com>
Cc:	"Pinski, Andrew" <Andrew.Pinski@...iumnetworks.com>,
	Ralf Baechle <ralf@...ux-mips.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Arnd Bergmann <arnd@...db.de>,
	David Howells <dhowells@...hat.com>,
	Markos Chandras <Markos.Chandras@...tec.com>,
	"linux-mips@...ux-mips.org" <linux-mips@...ux-mips.org>,
	John Crispin <blogic@...nwrt.org>
Subject: Re: Issue with BUG() in asm-gemeric/bug.h if CONFIG_BUG=n

On Mon, Sep 30, 2013 at 7:45 PM, David Daney <ddaney.cavm@...il.com> wrote:
>> What about using __builtin_unreachable when we can but turn off warnings
>> and use do{}while(0) when __builtin_unreachable does not exist?  This seems
>> the both worlds.  Newer compilers produce better code with unreachable
>> anyways.
>>
>
> Simply not true.
>
> do{}while(0) is a NOP it is no more useful than an ';' statement.  It
> doesn't serve as a magic uninitialized variable hiding mechanism.

You missed the "turn off warnings" part of the "and".

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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