linux-kernel - Re: [BUG] 2.6.25-rc5-mm1 kernel panic with "Exception: 501 " on powerpc

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Message-ID: <20080312223300.GE613@parisc-linux.org>
Date:	Wed, 12 Mar 2008 16:33:00 -0600
From:	Matthew Wilcox <matthew@....cx>
To:	Michael Ellerman <michael@...erman.id.au>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, linuxppc-dev@...abs.org,
	linux-kernel@...r.kernel.org,
	Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>
Subject: Re: [BUG] 2.6.25-rc5-mm1 kernel panic with "Exception: 501 " on powerpc

On Thu, Mar 13, 2008 at 09:26:09AM +1100, Michael Ellerman wrote:
> down() looks OK, but there's still a spin_lock_irq() in __down_common(),
> although I don't know if it makes sense for us to be in __down() at that
> stage.

The spin_lock_irq in __down_common is correct.  We're going to schedule(),
so we spin_unlock_irq() to save us passing the flags into the helper
function.  If we had interrupts disabled on entry, there's an Aieee
for that.

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