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     *  except the link member. When both the IRQ
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     *  except the link member. When both the IRQ
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     *  hash table lock and this lock are to be acquired,
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     *  hash table lock and this lock are to be acquired,
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     *  this lock must not be taken first.
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     *  this lock must not be taken first.
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     */
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     */
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    SPINLOCK_DECLARE(lock);
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    SPINLOCK_DECLARE(lock);
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    /** Send EOI before processing the interrupt.
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     *  This is essential for timer interrupt which
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     *  has to be acknowledged before doing preemption
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     *  to make sure another timer interrupt will
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     *  be eventually generated.
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     */
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    bool preack;
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    /** Unique device number. -1 if not yet assigned. */
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    /** Unique device number. -1 if not yet assigned. */
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    devno_t devno;
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    devno_t devno;
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    /** Actual IRQ number. -1 if not yet assigned. */
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    /** Actual IRQ number. -1 if not yet assigned. */
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    inr_t inr;
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    inr_t inr;
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    /** Trigger level of the IRQ.*/
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    /** Trigger level of the IRQ. */
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    irq_trigger_t trigger;
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    irq_trigger_t trigger;
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    /** Claim ownership of the IRQ. */
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    /** Claim ownership of the IRQ. */
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    irq_ownership_t (* claim)(void);
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    irq_ownership_t (* claim)(void);
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    /** Handler for this IRQ and device. */
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    /** Handler for this IRQ and device. */
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    irq_handler_t handler;
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    irq_handler_t handler;