[PATCH] x86_64: Fix zero mcfg entry workaround on x86-64

I broke this earlier when moving the patch from i386 to x86-64.
Need to return the virtual address here, not the physical address.
This fixes some boot time crashes on x86-64.

Cc: gregkh@suse.de
Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/x86_64/pci/mmconfig.c

@@ -46,7 +46,7 @@ static char __iomem *get_virt(unsigned int seg, unsigned bus)
 	if (pci_mmcfg_config_num == 1 &&
 		cfg->pci_segment_group_number == 0 &&
 		(cfg->start_bus_number | cfg->end_bus_number) == 0)
-		return cfg->base_address;
+		return pci_mmcfg_virt[0].virt;
 
 	/* Fall back to type 0 */
 	return 0;