linux-kernel - Re: [RFC PATCH] ARM: Use generic BUG() handler

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Date:	Tue, 1 Mar 2011 08:49:49 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Simon Glass <sjg@...omium.org>
Cc:	linux-arm-kernel@...ts.infradead.org,
	Tony Lindgren <tony@...mide.com>,
	Nicolas Pitre <nicolas.pitre@...aro.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Joe Perches <joe@...ches.com>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	Alexander Shishkin <virtuoso@...nd.org>,
	Phil Carmody <ext-phil.2.carmody@...ia.com>,
	Rabin Vincent <rabin@....in>, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH] ARM: Use generic BUG() handler

On Mon, Feb 28, 2011 at 04:27:43PM -0800, Simon Glass wrote:
> +	asm volatile("1:\t.word %c3\n"				\
> +		     ".pushsection __bug_table,\"a\"\n"		\
> +		     "2:\t.word 1b, %c0\n"			\
> +		     "\t.hword %c1, 0\n"			\
> +		     "\t.org 2b+%c2\n"				\

%c doesn't work on lots of versions of gcc, which is why we can't use
the generic bug support.  There's no way to reliably generate constants
without many compiler versions spitting out a '#' before them.
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