linux-kernel - Re: [PATCH 1/1] Taint kernel after WARN

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Date:	Mon, 11 Feb 2008 15:20:07 -0500
From:	"Josef 'Jeff' Sipek" <jeffpc@...efsipek.net>
To:	Nur Hussein <nurhussein@...il.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu,
	akpm@...ux-foundation.org, a.p.zijlstra@...llo.nl, gregkh@...e.de
Subject: Re: [PATCH 1/1] Taint kernel after WARN_ON(condition)

On Tue, Feb 12, 2008 at 03:52:22AM +0800, Nur Hussein wrote:
> This patch will taint the kernel with a new flag, 'W', whenever a
> warning is issued with WARN_ON(condition). Whenever a warning occurs, it
> is helpful to record this within the kernel state as a taint. When a BUG
> happens, it'd be useful to know if it was also preceded by a WARN.

Any architecture that has it's own WARN_ON will not taint the kernel.

Speaking of WARN_ON...

$ git-grep "[^A-Za-z_0-9]WARN_ON(1)" | wc -l
180

Maybe making a WARN() (similar to BUG) that does an unconditional warning
(and sets the taint flag) and having a simple wrapper around it for the
conditional WARN_ON would be worth it? Hm...looks like some of the USB folks
have a #define'd WARN to something quite a bit more complex (format string,
etc.)

Josef 'Jeff' Sipek.

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