From: Ingo Molnar <mingo@elte.hu>
Date: Sun, 4 May 2008 00:38:44 +0200

quoted text
> the same bug existed on x86 too: that too does a few IPIs without 
> irq_enter/irq_exit. We now removed the softlockup dependency so it 
> should not be required to do an irq_enter()/exit anymore - unless the 
> code that the IPI uses accesses jiffies. (but that would be unusual)

That move doesn't solve the problem, I'm strongly certain
arch's still need to add the irq_{enter,exit}().

I'll revert the irq_{enter,exit}() changes on one of my
sparc64 boxes to validate this later today.
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