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SubjectRe: [patch 2/5] genirq: Add optional hardware synchronization for shutdown
On Tue, 25 Jun 2019, Thomas Gleixner wrote:
> * Returns: false if a threaded handler is active.
> *
> * This function may be called - with care - from IRQ context.
> + *
> + * It does not check whether there is an interrupt on flight at the
> + * hardware level, but not serviced yet, as this might deadlock.

+ when invoked from an interrupt disabled region.

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