PCIE_PORT_SERVICE_DPC_SHIFT   22 drivers/pci/pcie/portdrv.h #define PCIE_PORT_SERVICE_DPC		(1 << PCIE_PORT_SERVICE_DPC_SHIFT)
PCIE_PORT_SERVICE_DPC_SHIFT  152 drivers/pci/pcie/portdrv_core.c 		irqs[PCIE_PORT_SERVICE_DPC_SHIFT] = pci_irq_vector(dev, dpc);