From: Andrea Arcangeli <aarcange@redhat.com>
Subject: Re: [PATCH] fix pgd_lock deadlock
Date: Wed, 16 Feb 2011 00:17:33 +0100
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To: Thomas Gleixner <tglx@linutronix.de>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>, "H. Peter Anvin" <hpa@zytor.com>, the arch/x86 maintainers <x86@kernel.org>, "Xen-devel@lists.xensource.com" <Xen-devel@lists.xensource.com>, Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, Ian Campbell <Ian.Campbell@citrix.com>, Jan Beulich <JBeulich@novell.com>, Larry Woodman <lwoodman@redhat.com>, Andrew Morton <akpm@linux-foundation.org>, Andi Kleen <ak@suse.de>, Johannes Weiner <jweiner@redhat.com>, Hugh Dickins <hughd@google.com>, Rik van Riel <riel@redhat.com>
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On Wed, Feb 16, 2011 at 12:03:30AM +0100, Thomas Gleixner wrote:
> I assume you run it with a lockdep enabled kernel as well, right ?

Yes, I always run with lockdep and prove locking enabled on my test
box, not sure how it's meant to trigger more bugs in this case, the
debug check that should be relevant for this is DEBUG_VM and that is
enabled too of course. I didn't try DEBUG_PAGEALLOC yet.