x86-64, NUMA: Unify emulated distance mapping

NUMA emulation needs to update node distance information.  It did it
by remapping apicid to PXM mapping, even when amdtopology is being
used.  There is no reason to go through such convolution.  The generic
code has all the information necessary to transform the distance table
to the emulated nid space.

Implement generic distance table transformation in numa_emulation()
and drop private implementations in srat_64 and amdtopology_64.  This
makes find_node_by_addr() and fake_physnodes() and related functions
unnecessary, drop them.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Cyrill Gorcunov <gorcunov@gmail.com>
Cc: Shaohui Zheng <shaohui.zheng@intel.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: H. Peter Anvin <hpa@linux.intel.com>

arch/x86/include/asm/acpi.h

@@ -186,12 +186,6 @@ struct bootnode;
 #ifdef CONFIG_ACPI_NUMA
 extern int acpi_numa;
 extern int x86_acpi_numa_init(void);
-
-#ifdef CONFIG_NUMA_EMU
-extern void acpi_fake_nodes(const struct bootnode *fake_nodes,
-				   int num_nodes);
-extern int acpi_emu_node_distance(int a, int b);
-#endif
 #endif /* CONFIG_ACPI_NUMA */
 
 #define acpi_unlazy_tlb(x)	leave_mm(x)

arch/x86/include/asm/amd_nb.h

@@ -20,10 +20,6 @@ extern int amd_numa_init(void);
 extern int amd_get_subcaches(int);
 extern int amd_set_subcaches(int, int);
 
-#ifdef CONFIG_NUMA_EMU
-extern void amd_fake_nodes(const struct bootnode *nodes, int nr_nodes);
-#endif
-
 struct amd_northbridge {
 	struct pci_dev *misc;
 	struct pci_dev *link;

arch/x86/include/asm/numa_64.h

@@ -34,7 +34,6 @@ extern void __init numa_set_distance(int from, int to, int distance);
 #define FAKE_NODE_MIN_SIZE	((u64)32 << 20)
 #define FAKE_NODE_MIN_HASH_MASK	(~(FAKE_NODE_MIN_SIZE - 1UL))
 void numa_emu_cmdline(char *);
-int __init find_node_by_addr(unsigned long addr);
 #endif /* CONFIG_NUMA_EMU */
 #else
 static inline int numa_cpu_node(int cpu)		{ return NUMA_NO_NODE; }