linux-kernel - Re: [PATCH][RFC] getting rid of stupid loop in BUG()

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Message-ID: <20070725065039.GA8555@osiris.boeblingen.de.ibm.com>
Date:	Wed, 25 Jul 2007 08:50:39 +0200
From:	Heiko Carstens <heiko.carstens@...ibm.com>
To:	David Miller <davem@...emloft.net>
Cc:	jeremy@...p.org, hpa@...or.com, kaos@....com.au,
	xyzzy@...akeasy.org, viro@....linux.org.uk,
	torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-arch@...r.kernel.org
Subject: Re: [PATCH][RFC] getting rid of stupid loop in BUG()

On Tue, Jul 24, 2007 at 11:29:14PM -0700, David Miller wrote:
> From: Jeremy Fitzhardinge <jeremy@...p.org>
> Date: Tue, 24 Jul 2007 23:24:55 -0700
> 
> > H. Peter Anvin wrote:
> > > How far back was __builtin_trap() supported?
> > 
> > I think its relatively recent, but it might be within our supported
> > compiler window.
> 
> I'm pretty sure it is.

We had this in include/asm-s390/bug.h to avoid compile errors with gcc 3.2:

+#if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 3)
+	__builtin_trap();
+#else
+	asm volatile(".long 0");
+#endif
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