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Re: spinlock_irq & spinlock_irq_save

> spin_lock_irqsave/spin_unlock_irqrestore allows you to save the current
> irq state, disable, then restore to original state.  this is required
> when you _don't know_ if the irq was originally enabled.

does spin_lock_irqsave avoid to disable interrupts if these are allready disabled?... or call cli() anyway?







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