x86/amd_nb, char/amd64-agp: Use amd_nb_num() accessor

... to find whether there are northbridges present on the
system. Convert the last forgotten user and therefore, unexport
amd_nb_misc_ids[] too.
Signed-off-by: NBorislav Petkov <bp@suse.de>
Cc: Michal Kubecek <mkubecek@suse.cz>
Cc: Yazen Ghannam <yazen.ghannam@amd.com>
Link: https://lkml.kernel.org/r/20200316150725.925-1-bp@alien8.de

arch/x86/include/asm/amd_nb.h

@@ -12,7 +12,6 @@ struct amd_nb_bus_dev_range {
 	u8 dev_limit;
 };
 
-extern const struct pci_device_id amd_nb_misc_ids[];
 extern const struct amd_nb_bus_dev_range amd_nb_bus_dev_ranges[];
 
 extern bool early_is_amd_nb(u32 value);

arch/x86/kernel/amd_nb.c

@@ -36,10 +36,9 @@ static const struct pci_device_id amd_root_ids[] = {
 	{}
 };
 
-
 #define PCI_DEVICE_ID_AMD_CNB17H_F4     0x1704
 
-const struct pci_device_id amd_nb_misc_ids[] = {
+static const struct pci_device_id amd_nb_misc_ids[] = {
 	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_K8_NB_MISC) },
 	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_10H_NB_MISC) },
 	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_NB_F3) },
@@ -56,7 +55,6 @@ const struct pci_device_id amd_nb_misc_ids[] = {
 	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_19H_DF_F3) },
 	{}
 };
-EXPORT_SYMBOL_GPL(amd_nb_misc_ids);
 
 static const struct pci_device_id amd_nb_link_ids[] = {
 	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_15H_NB_F4) },

drivers/char/agp/amd64-agp.c

@@ -775,7 +775,7 @@ int __init agp_amd64_init(void)
 		}
 
 		/* First check that we have at least one AMD64 NB */
-		if (!pci_dev_present(amd_nb_misc_ids)) {
+		if (!amd_nb_num()) {
 			pci_unregister_driver(&agp_amd64_pci_driver);
 			return -ENODEV;
 		}