PCI_CAP_ID_EXP     57 drivers/net/wireless/realtek/rtlwifi/pci.h #define PCI_CAP_ID_EXP			0x10
PCI_CAP_ID_EXP    223 include/uapi/linux/pci_regs.h #define  PCI_CAP_ID_EXP		0x10	/* PCI Express */