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Date: Wed, 12 Mar 2008 11:51:02 -0600
From: Matthew Wilcox <matthew@wil.cx>
To: Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [BUG] 2.6.25-rc5-mm1 kernel panic with "Exception: 501 " on
	powerpc
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Cc: linuxppc-dev@ozlabs.org, linux-kernel@vger.kernel.org,
	Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>
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On Wed, Mar 12, 2008 at 10:46:45AM -0700, Andrew Morton wrote:
> On Wed, 12 Mar 2008 18:25:37 +0530 Kamalesh Babulal <kamalesh@linux.vnet.ibm.com> wrote:
> Beats me.  Maybe we're still enabling interrupts too early.  But the new
> semaphore code got fixed (didn't it?)

On the 7th, according to my records.  Easy to check -- look in
kernel/semaphore.c and see whether down() is using spin_lock_irqsave
(good) or spin_lock_irq (bad).

-- 
Intel are signing my paycheques ... these opinions are still mine
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours.  We can't possibly take such
a retrograde step."