From: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>
Date: Sun, 18 Apr 2010 21:57:41 -0700

quoted text
> This patch adds a callback function pointer to the irq_desc
> structure, along with a registration function and a read-only
> proc entry for each interrupt.
> 
> This affinity_hint handle for each interrupt can be used by
> underlying drivers that need a better mechanism to control
> interrupt affinity.  The underlying driver can register a
> callback for the interrupt, which will allow the driver to
> provide the CPU mask for the interrupt to anything that
> requests it.  The intent is to extend the userspace daemon,
> irqbalance, to help hint to it a preferred CPU mask to balance
> the interrupt into.
> 
> Signed-off-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>

I'll leave it to the IRQ layer experts whether this is
appropriate or not, it doesn't look too bad to me.
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