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Static exynos_irq_chip structures, containing driver specific data, are referenced only through opaque data pointer in const of_device_id table. The contents of pointed memory (exynos_irq_chip structure itself) is then copied with kmemdup() during wakeup initialization so exynos_irq_chip can be made const for code safenes. Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>