linux-kernel - Re: [PATCH] x86: remove unneeded endless loop in BUG()

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Date:	Fri, 20 Feb 2009 09:28:08 +0100
From:	Petr Tesarik <ptesarik@...e.cz>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Jeremy Fitzhardinge <jeremy@...p.org>, Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: remove unneeded endless loop in BUG()

H. Peter Anvin píše v Čt 19. 02. 2009 v 12:48 -0800:
> Jeremy Fitzhardinge wrote:
> > 
> > There's no reason to expect an "asm volatile" to stay put; the 
> > "volatile" has nothing to do with preventing code motion.  The only way 
> > to make an asm stick in one place is with data dependencies, and I'm not 
> > sure what the dependency for __builtin_trap might be.  I'm guessing its 
> > a "memory" clobber, but that's pure guesswork.
> > 
> 
> I looked through this with HJL; the bottom line is that although it 
> probably would work, it's not worth it.
> 
> I submitted GCC bug 39252 to get __builtin_not_reached(); instead.

Thank you! I like it this way, too.

Petr Tesarik


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