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 17:44:56 +0200
From:	Bernhard Walle <bwalle@...e.de>
To:	Bernhard Walle <bwalle@...e.de>
Cc:	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Vegard Nossum <vegard.nossum@...il.com>,
	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>,
	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

* Bernhard Walle <bwalle@...e.de> [2008-07-20 15:03]:
> 
> Because I didn't know that interface. And because I don't see that
> interface on my two systems that I just checked. i386 and x86-64. What
> do I have to do to enable that interface?

That interface depends on CONFIG_MEMORY_HOTPLUG. But given to that
dependency list,

128 config MEMORY_HOTPLUG
129         bool "Allow for memory hot-add"
130         depends on SPARSEMEM || X86_64_ACPI_NUMA
131         depends on HOTPLUG && !HIBERNATION && ARCH_ENABLE_MEMORY_HOTPLUG
132         depends on (IA64 || X86 || PPC64 || SUPERH || S390)

that interface is off on *many* systems (i386, x86_64), so we can't rely
on that interface in kexec. I think on POWER it's much more common than
on PC architectures.



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