linux-kernel - Re: [rfc][patch] mm: lockdep page lock

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Message-ID: <1269437291.5109.238.camel@twins>
Date:	Wed, 24 Mar 2010 14:28:11 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Nick Piggin <npiggin@...e.de>
Cc:	Jan Kara <jack@...e.cz>, Andrew Morton <akpm@...ux-foundation.org>,
	linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [rfc][patch] mm: lockdep page lock

On Tue, 2010-03-16 at 13:21 +1100, Nick Piggin wrote:
> 
> 
> Agreed (btw. Peter is there any way to turn lock debugging back on?
> it's annoying when cpufreq hotplug code or something early breaks and
> you have to reboot in order to do any testing).

Not really, the only way to do that is to get the full system back into
a known (zero) lock state and then fully reset the lockdep state.

It might be possible using the freezer, but I haven't really looked at
that, its usually simpler to simply fix the offending code or simply not
build it in your kernel.


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