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spin_lock spin_lock_irqsave

spin_lock spin_lock_irqsave

若是保護共用的資料 [ 以下簡稱 CS]，若進入 spin_lock_irqsave()，CPU 都已經被 disable irq 並且已經 preempt_disable() 了啊，所以 preempt 跟 interrupt 都不會發生，也就是 CPU 沒有機會被切換掉，會一直做到離開 CS；那為何要 save local CPU status ?

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