linux-kernel - Re: [PATCH RESEND] bug: When !CONFIG_BUG, simplify WARN_ON

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Message-ID: <16994526.0QcMcz0xo0@wuerfel>
Date:	Mon, 24 Feb 2014 14:39:46 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
Cc:	David Howells <dhowells@...hat.com>,
	Josh Triplett <josh@...htriplett.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RESEND] bug: When !CONFIG_BUG, simplify WARN_ON_ONCE and family

On Monday 24 February 2014 13:16:05 One Thousand Gnomes wrote:
> 
> While I agree defining it as do {} while(1); would be a lot smarter,
> simply making it required that a platform provides an implementation of
> BUG() would be even better. 

But how do we get there? The majority of architectures define BUG()
already, but a lot of them only if CONFIG_BUG is enabled. That is
of course trivial do change, and it is what my older patch does
for ARM and x86.

We also have seven architectures without a BUG() implementation (c6x,
m32r, meta, microblaze, score, sh, unicore32) and six more (arm64,
hexagon openrisc tile um xtensa) that have no bug.h at all.

	Arnd
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