[PATCH] irq_cpustat cleanup
From: Christoph Hellwig <hch@lst.de> currently only x86_64 and ia64 don't use the generic irq_cpustat code and both have to workaround it's brokenness for the non-default case. x86_64 defines an empty irq_cpustat_t even if it doesn't need one and ia64 adds CONFIG_IA64 ifdefs around all users. What about this patch instead to make __ARCH_IRQ_STAT useable?
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