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user_irq_unclaim() function
Mark a user IRQ as no longer used on the calling core User IRQs starting from FIRST_USER_IRQ are not connected to any hardware, but can be triggered by irq_set_pending. This method explicitly releases ownership of a user IRQ, so other code can know it is free to use.
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Notes
User IRQs are a core local feature; they cannot be used to communicate between cores. Therefore all functions dealing with Uer IRQs affect only the calling core it is customary to have disabled the irq and removed the handler prior to calling this method.