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In order to avoid compilation errors when a driver references set_handle_irq(), but that the architecture doesn't select GENERIC_IRQ_MULTI_HANDLER, add a stub function that will just WARN_ON_ONCE() if ever used. Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com> [maz: commit message] Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20200924071754.4509-2-thunder.leizhen@huawei.com