linux-kernel - Re: linux-next: Tree for July 18: warning at kernel/lockdep.c:2068 trace_hardirqs_on

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Date:	Sun, 20 Jul 2008 02:01:02 -0700
From:	Dave Hansen <dave@...ux.vnet.ibm.com>
To:	Vegard Nossum <vegard.nossum@...il.com>
Cc:	Greg KH <gregkh@...e.de>,
	Mariusz Kozlowski <m.kozlowski@...land.pl>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	kernel-testers@...r.kernel.org, linux-next@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Bernhard Walle <bwalle@...e.de>, Ingo Molnar <mingo@...e.hu>,
	Vivek Goyal <vgoyal@...hat.com>,
	kexec <kexec@...ts.infradead.org>
Subject: Re: linux-next: Tree for July 18: warning at kernel/lockdep.c:2068
	trace_hardirqs_on_caller

On Sun, 2008-07-20 at 01:11 +0200, Vegard Nossum wrote:
> Maybe the firmware memmap code can simply run a little later in the
> boot sequence?

Heh, I'm catching up on this thread...

It is possible that it could run later.  But, I do know that there are
at least a couple of these tables (on various arches) that we toss out
of memory or become unavailable later in boot.  

I do this this:

    sysfs: add /sys/firmware/memmap

is really being done at the wrong level.  I don't, for instance, see
*any* reference to memory hotplug in these patches.  That's because
they're done against firmware structures, and memory hotplug doesn't
update firmware structures on the two architectures that I can remember
(ppc64 and x86).

In other words, kexec using this probably won't work on a memory hotplug
machine.

Secondly, why don't we just modify the
existing /sys/devices/system/memory things to properly export what exec
needs?  They're already cross-platform *and* they're updated with memory
hotplug events.  

-- Dave

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