commit c762fe5815f1220159f257ec4cf751b47bab98ff
Author: Bjorn Helgaas <bhelgaas@google.com>
Date:   Mon Jan 9 13:42:12 2012 -0700

    x86/PCI: build amd_bus.o only when CONFIG_AMD_NB=y
    
    We only need amd_bus.o for AMD systems with PCI.  arch/x86/pci/Makefile
    already depends on CONFIG_PCI=y, so this patch just adds the dependency
    on CONFIG_AMD_NB.
    
    Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

diff --git a/arch/x86/pci/Makefile b/arch/x86/pci/Makefile
index 6b8759f..d24d3da 100644
--- a/arch/x86/pci/Makefile
+++ b/arch/x86/pci/Makefile
@@ -18,8 +18,9 @@ obj-$(CONFIG_X86_NUMAQ)		+= numaq_32.o
 obj-$(CONFIG_X86_MRST)		+= mrst.o
 
 obj-y				+= common.o early.o
-obj-y				+= amd_bus.o bus_numa.o
+obj-y				+= bus_numa.o
 
+obj-$(CONFIG_AMD_NB)		+= amd_bus.o
 obj-$(CONFIG_PCI_CNB20LE_QUIRK)	+= broadcom_bus.o
 
 ifeq ($(CONFIG_PCI_DEBUG),y)