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

[Matthew Wilcox]

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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