diff --git a/include/linux/pci.h b/include/linux/pci.h
index 4bb156b..6fd4765 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1140,6 +1140,8 @@
 static inline void pci_mmcfg_late_init(void) { }
 #endif
 
+int pci_ext_cfg_avail(struct pci_dev *dev);
+
 #ifdef CONFIG_HAS_IOMEM
 static inline void __iomem *pci_ioremap_bar(struct pci_dev *pdev, int bar)
 {