[PATCH] powerpc: Fix missing doorbell IPIs during nap power saving

[Benjamin Herrenschmidt]

On Mon, 2013-04-29 at 18:17 +1000, Ian Munsie wrote:
> This is not an issue with other interrupts that can wake a thread
> (external, decrementer) as they are level sensitive and will continue to
> be asserted by the hardware.

However, it might be worth experimenting setting the corresponding
bits in the PACA as well, as this will diminish the latency of
processing them.

IE. local_irq_enable() will see the bit, generate an interrupt
frame and call the handler which is a faster path than re-enabling
MSR:EE and then taking an external interrupt.

Cheers,
Ben.