fix build bug in "x86: add PCI extended config space access for AMD Barcelona"

1 files changed, 4 insertions, 0 deletions

diff --git a/include/asm-x86/mmconfig.h b/include/asm-x86/mmconfig.h
index 46d6bb135df4..691798fbee10 100644
--- a/include/asm-x86/mmconfig.h
+++ b/include/asm-x86/mmconfig.h
@@ -9,6 +9,10 @@ static inline void fam10h_check_enable_mmcfg(void) { }
 static inline void check_enable_amd_mmconf_dmi(void) { }
 #endif
 
+#if defined(CONFIG_SMP) && defined(CONFIG_X86_64)
 extern void __cpuinit amd_enable_pci_ext_cfg(struct cpuinfo_x86 *c);
+#else
+static inline void amd_enable_pci_ext_cfg(struct cpuinfo_x86 *c) { }
+#endif
 
 #endif