x86-64, NUMA: Add common find_node_by_addr()

srat_64.c and amdtopology_64.c had their own versions of
find_node_by_addr() which were basically the same.  Add common one in
numa_64.c and remove the duplicates.
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/numa_64.h

@@ -35,6 +35,7 @@ extern int __init numa_add_memblk(int nodeid, u64 start, u64 end);
 #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; }

arch/x86/mm/amdtopology_64.c

@@ -205,19 +205,6 @@ static s16 fake_apicid_to_node[MAX_LOCAL_APIC] __initdata = {
 	[0 ... MAX_LOCAL_APIC-1] = NUMA_NO_NODE
 };
 
-static int __init find_node_by_addr(unsigned long addr)
-{
-	int ret = NUMA_NO_NODE;
-	int i;
-
-	for (i = 0; i < 8; i++)
-		if (addr >= numa_nodes[i].start && addr < numa_nodes[i].end) {
-			ret = i;
-			break;
-		}
-	return ret;
-}
-
 /*
  * For NUMA emulation, fake proximity domain (_PXM) to node id mappings must be
  * setup to represent the physical topology but reflect the emulated

arch/x86/mm/numa_64.c

@@ -430,6 +430,25 @@ void __init numa_emu_cmdline(char *str)
 	cmdline = str;
 }
 
+int __init find_node_by_addr(unsigned long addr)
+{
+	int ret = NUMA_NO_NODE;
+	int i;
+
+	for_each_node_mask(i, mem_nodes_parsed) {
+		/*
+		 * Find the real node that this emulated node appears on.  For
+		 * the sake of simplicity, we only use a real node's starting
+		 * address to determine which emulated node it appears on.
+		 */
+		if (addr >= numa_nodes[i].start && addr < numa_nodes[i].end) {
+			ret = i;
+			break;
+		}
+	}
+	return ret;
+}
+
 static int __init setup_physnodes(unsigned long start, unsigned long end)
 {
 	int ret = 0;

arch/x86/mm/srat_64.c

@@ -277,24 +277,6 @@ static int fake_node_to_pxm_map[MAX_NUMNODES] __initdata = {
 static s16 fake_apicid_to_node[MAX_LOCAL_APIC] __initdata = {
 	[0 ... MAX_LOCAL_APIC-1] = NUMA_NO_NODE
 };
-static int __init find_node_by_addr(unsigned long addr)
-{
-	int ret = NUMA_NO_NODE;
-	int i;
-
-	for_each_node_mask(i, mem_nodes_parsed) {
-		/*
-		 * Find the real node that this emulated node appears on.  For
-		 * the sake of simplicity, we only use a real node's starting
-		 * address to determine which emulated node it appears on.
-		 */
-		if (addr >= numa_nodes[i].start && addr < numa_nodes[i].end) {
-			ret = i;
-			break;
-		}
-	}
-	return ret;
-}
 
 /*
  * In NUMA emulation, we need to setup proximity domain (_PXM) to node ID