linux-kernel - lockdep and oops_in

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Message-ID: <AANLkTi=gnsPUPomCUXRLgV0PhNxtBaXiCheDU=yRV0Kx@mail.gmail.com>
Date:	Thu, 5 Aug 2010 16:21:12 +1000
From:	Dave Airlie <airlied@...il.com>
To:	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: lockdep and oops_in_progress

Hi guys,

I was debugging a wierd issue with suspend/resume and fbcon/X with
some recent work Jesse and myself did to try and make sure a pinned
fbcon always gets the text on it with a panic or oops occurs.

It does this by testing the oops_in_progress flag, however once any
lockdep issue occurs it looks to me that we leave this flag set
forever, in most places I can see in oops code etc they call
bust_spinlocks(1) then bust_spinlocks(0) to balance the
oops_in_progress value, but lockdep never seems to reset it.

I'm wondering if there is an inherent reason for this or if I whip up
a patch to reset once the lockdep is printed if this would cause any
issues?

Dave.
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