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A fix for the dl_server 'requires' idle_cpu() usage, which made me note that it and available_idle_cpu() are extern function calls. And while idle_cpu() is used outside of kernel/sched/, available_idle_cpu() is not. This makes it hard to make idle_cpu() an inline helper, so provide idle_rq() and implement idle_cpu() and available_idle_cpu() using that. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>