pci: implement "pci=noaer"

For cases in which CONFIG_PCIEAER=y (such as distro kernels), allow users
to disable PCIE Advanced Error Reporting by using "pci=noaer" on the
kernel command line.

This can be used to work around hardware or (kernel) software problems.

Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/pci/pci.h

@@ -52,6 +52,12 @@ void pci_restore_msi_state(struct pci_dev *dev);
 static inline void pci_restore_msi_state(struct pci_dev *dev) {}
 #endif
 
+#ifdef CONFIG_PCIEAER
+void pci_no_aer(void);
+#else
+static inline void pci_no_aer(void) { }
+#endif
+
 static inline int pci_no_d1d2(struct pci_dev *dev)
 {
 	unsigned int parent_dstates = 0;