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

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Date:	Mon, 21 Jul 2008 17:00:37 +0200
From:	Bernhard Walle <bwalle@...e.de>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	Stephen Rothwell <sfr@...b.auug.org.au>,
	Vegard Nossum <vegard.nossum@...il.com>,
	Greg KH <gregkh@...e.de>, kexec <kexec@...ts.infradead.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Mariusz Kozlowski <m.kozlowski@...land.pl>,
	Pekka Enberg <penberg@...helsinki.fi>,
	linux-next@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	kernel-testers@...r.kernel.org
Subject: Re: linux-next: Tree for July 18: warning at kernel/lockdep.c:2068
 trace_hardirqs_on_caller

* Vivek Goyal [2008-07-21 09:39]:
>
> On Mon, Jul 21, 2008 at 03:25:39PM +0200, Bernhard Walle wrote:
> > * Vivek Goyal [2008-07-21 09:17]:
> > > 
> > > Is /proc/iomem updated upon memory hotplug event.
> > 
> > Yes. I just checked that (yesterday).
> > 
> > I think it would make sense to extend /sys/firmware/memmap on
> > hot-plugging. Just because on reboot, the firmware will see that
> > memory, too, and report it. However, we need a way to discriminate the
> > originally firmware-provided memory map with later added memory. I'm
> > not sure how that can be done, I have to think about it.
> 
> Probably use another type of RAM identifier (System RAM (hotplug)).
> 
> But the point is, if /sys/devices/system/memory also represents all
> the physical memory present in the system then it might be not be
> justified to create another similar interface. (Until and unless there
> is something unique about /sys/firmware/memmap).

But I don't see anything like a physical address there:

  /sys/devices/system/memory/memory2:
  -r--r--r-- 1 root root 4096 2008-07-21 15:45 phys_device
  -r--r--r-- 1 root root 4096 2008-07-21 15:45 phys_index
  -rw-r--r-- 1 root root 4096 2008-07-21 15:45 state

(on a PPC64 machine where SUSE kernel has that interface enabled by
default).


Bernhard
-- 
Bernhard Walle, SUSE LINUX Products GmbH, Architecture Development
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