linux-kernel - Re: PATCH] debug: add notifier chain debugging

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Date:	Wed, 20 Aug 2008 12:53:53 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Arjan van de Ven <arjan@...radead.org>,
	linux-kernel@...r.kernel.org
Subject: Re: PATCH] debug: add notifier chain debugging


* Andrew Morton <akpm@...ux-foundation.org> wrote:

> > +config DEBUG_NOTIFIERS
> > +	bool "Debug notifier call chains"
> > +	depends on DEBUG_KERNEL
> > +	help
> > +	  Enable this to turn on sanity checking for notifier call chains.
> > +	  This is most useful for kernel developers to make sure that
> > +	  modules properly unregister themselves from notifier chains.
> > +	  This is a relatively cheap check but if you care about maximum
> > +	  performance, say N.
> > +
> 
> If we remove the first two checks then surely we can afford to add the
> remaining check unconditionally and lose the new config option and its
> ifdef.

yeah, that's sensible. Arjan?

	Ingo
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