x86, NUMA: Unify 32/64bit numa_cpu_node() implementation

Currently, the only meaningful user of apic->x86_32_numa_cpu_node() is
NUMAQ which returns valid mapping only after CPU is initialized during
SMP bringup; thus, the previous patch to set apicid -> node in
setup_local_APIC() makes __apicid_to_node[] always contain the correct
mapping whether custom apic->x86_32_numa_cpu_node() is used or not.

So, there is no reason to keep separate 32bit implementation.  We can
always consult __apicid_to_node[].  Move 64bit implementation from
numa_64.c to numa.c and remove 32bit implementation from numa_32.c.
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>

arch/x86/include/asm/numa.h

 #ifndef _ASM_X86_NUMA_H
 #define _ASM_X86_NUMA_H
 
+#include <linux/nodemask.h>
+
 #include <asm/topology.h>
 #include <asm/apicdef.h>
 
@@ -22,10 +24,18 @@ static inline void set_apicid_to_node(int apicid, s16 node)
 {
 	__apicid_to_node[apicid] = node;
 }
+
+extern int __cpuinit numa_cpu_node(int cpu);
+
 #else	/* CONFIG_NUMA */
 static inline void set_apicid_to_node(int apicid, s16 node)
 {
 }
+
+static inline int numa_cpu_node(int cpu)
+{
+	return NUMA_NO_NODE;
+}
 #endif	/* CONFIG_NUMA */
 
 #ifdef CONFIG_X86_32

arch/x86/include/asm/numa_32.h

@@ -5,12 +5,6 @@ extern int numa_off;
 
 extern int pxm_to_nid(int pxm);
 
-#ifdef CONFIG_NUMA
-extern int __cpuinit numa_cpu_node(int cpu);
-#else	/* CONFIG_NUMA */
-static inline int numa_cpu_node(int cpu)		{ return NUMA_NO_NODE; }
-#endif	/* CONFIG_NUMA */
-
 #ifdef CONFIG_HIGHMEM
 extern void set_highmem_pages_init(void);
 #else

arch/x86/include/asm/numa_64.h

@@ -26,7 +26,6 @@ extern void setup_node_bootmem(int nodeid, unsigned long start,
 
 extern nodemask_t numa_nodes_parsed __initdata;
 
-extern int __cpuinit numa_cpu_node(int cpu);
 extern int __init numa_add_memblk(int nodeid, u64 start, u64 end);
 extern void __init numa_set_distance(int from, int to, int distance);
 
@@ -35,8 +34,6 @@ extern void __init numa_set_distance(int from, int to, int distance);
 #define FAKE_NODE_MIN_HASH_MASK	(~(FAKE_NODE_MIN_SIZE - 1UL))
 void numa_emu_cmdline(char *);
 #endif /* CONFIG_NUMA_EMU */
-#else
-static inline int numa_cpu_node(int cpu)		{ return NUMA_NO_NODE; }
 #endif
 
 #endif /* _ASM_X86_NUMA_64_H */

arch/x86/mm/numa.c

@@ -32,6 +32,15 @@ s16 __apicid_to_node[MAX_LOCAL_APIC] __cpuinitdata = {
 	[0 ... MAX_LOCAL_APIC-1] = NUMA_NO_NODE
 };
 
+int __cpuinit numa_cpu_node(int cpu)
+{
+	int apicid = early_per_cpu(x86_cpu_to_apicid, cpu);
+
+	if (apicid != BAD_APICID)
+		return __apicid_to_node[apicid];
+	return NUMA_NO_NODE;
+}
+
 cpumask_var_t node_to_cpumask_map[MAX_NUMNODES];
 EXPORT_SYMBOL(node_to_cpumask_map);
 

arch/x86/mm/numa_32.c

@@ -107,11 +107,6 @@ extern unsigned long highend_pfn, highstart_pfn;
 static void *node_remap_start_vaddr[MAX_NUMNODES];
 void set_pmd_pfn(unsigned long vaddr, unsigned long pfn, pgprot_t flags);
 
-int __cpuinit numa_cpu_node(int cpu)
-{
-	return apic->x86_32_numa_cpu_node(cpu);
-}
-
 /*
  * FLAT - support for basic PC memory model with discontig enabled, essentially
  *        a single node with all available processors in it with a flat

arch/x86/mm/numa_64.c

@@ -512,15 +512,6 @@ unsigned long __init numa_free_all_bootmem(void)
 	return pages;
 }
 
-int __cpuinit numa_cpu_node(int cpu)
-{
-	int apicid = early_per_cpu(x86_cpu_to_apicid, cpu);
-
-	if (apicid != BAD_APICID)
-		return __apicid_to_node[apicid];
-	return NUMA_NO_NODE;
-}
-
 #ifdef CONFIG_MEMORY_HOTPLUG
 int memory_add_physaddr_to_nid(u64 start)
 {