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Date: Fri, 11 Apr 2008 22:11:02 -0700
From: Andrew Morton <akpm@linux-foundation.org>
To: "Miles Lane" <miles.lane@gmail.com>
Cc: LKML <linux-kernel@vger.kernel.org>, len.brown@intel.com,
       linux-acpi@vger.kernel.org
Subject: Re: 2.6.25-rc8-mm2 -- initcall acpi_init+0x0/0x216() returned with
 preemption imbalance
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On Fri, 11 Apr 2008 15:41:17 -0400 "Miles Lane" <miles.lane@gmail.com> wrote:

> Is this indicative of a kernel or hardware problem?
> 
> [    0.279606] ACPI: Using IOAPIC for interrupt routing
> [    0.279789] initcall acpi_init+0x0/0x216() returned with preemption imbalance
> [    0.330789] ACPI: PCI Root Bridge [PCI0] (0000:00)
> 

That's a software bug.  Something under acpi_init() has mismatched
preempt_disable/preempt_enable or mismatched spin_lock/spin_unlock, etc.