x86-64, NUMA: Unify use of memblk in all init methods

Make both amd and dummy use numa_add_memblk() to describe the detected
memory blocks.  This allows initmem_init() to call
numa_register_memblk() regardless of init method in use.  Drop custom
memory registration codes from amd and dummy.

After this change, memblk merge/cleanup in numa_register_memblks() is
applied to all init methods.

As this makes compute_hash_shift() and numa_register_memblks() used
only inside numa_64.c, make them static.
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

@@ -8,9 +8,6 @@ struct bootnode {
 	u64 end;
 };
 
-extern int compute_hash_shift(struct bootnode *nodes, int numblks,
-			      int *nodeids);
-
 #define ZONE_ALIGN (1UL << (MAX_ORDER+PAGE_SHIFT))
 
 extern int numa_off;
@@ -33,7 +30,6 @@ extern struct bootnode numa_nodes[MAX_NUMNODES] __initdata;
 
 extern int __cpuinit numa_cpu_node(int cpu);
 extern int __init numa_add_memblk(int nodeid, u64 start, u64 end);
-extern int __init numa_register_memblks(void);
 
 #ifdef CONFIG_NUMA_EMU
 #define FAKE_NODE_MIN_SIZE	((u64)32 << 20)

arch/x86/mm/amdtopology_64.c

@@ -167,6 +167,7 @@ int __init amd_numa_init(void)
 
 		numa_nodes[nodeid].start = base;
 		numa_nodes[nodeid].end = limit;
+		numa_add_memblk(nodeid, base, limit);
 
 		prevbase = base;
 
@@ -263,18 +264,6 @@ int __init amd_scan_nodes(void)
 {
 	int i;
 
-	memnode_shift = compute_hash_shift(numa_nodes, 8, NULL);
-	if (memnode_shift < 0) {
-		pr_err("No NUMA node hash function found. Contact maintainer\n");
-		return -1;
-	}
-	pr_info("Using node hash shift of %d\n", memnode_shift);
-
-	/* use the coreid bits from early_identify_cpu */
-	for_each_node_mask(i, node_possible_map)
-		memblock_x86_register_active_regions(i,
-				numa_nodes[i].start >> PAGE_SHIFT,
-				numa_nodes[i].end >> PAGE_SHIFT);
 	init_memory_mapping_high();
 	for_each_node_mask(i, node_possible_map)
 		setup_node_bootmem(i, numa_nodes[i].start, numa_nodes[i].end);

arch/x86/mm/numa_64.c

@@ -131,8 +131,8 @@ static int __init extract_lsb_from_nodes(const struct bootnode *nodes,
 	return i;
 }
 
-int __init compute_hash_shift(struct bootnode *nodes, int numnodes,
-			      int *nodeids)
+static int __init compute_hash_shift(struct bootnode *nodes, int numnodes,
+				     int *nodeids)
 {
 	int shift;
 
@@ -287,7 +287,7 @@ setup_node_bootmem(int nodeid, unsigned long start, unsigned long end)
 	node_set_online(nodeid);
 }
 
-int __init numa_register_memblks(void)
+static int __init numa_register_memblks(void)
 {
 	int i;
 
@@ -713,17 +713,13 @@ static int dummy_numa_init(void)
 
 	node_set(0, cpu_nodes_parsed);
 	node_set(0, mem_nodes_parsed);
+	numa_add_memblk(0, 0, (u64)max_pfn << PAGE_SHIFT);
 
 	return 0;
 }
 
 static int dummy_scan_nodes(void)
 {
-	/* setup dummy node covering all memory */
-	memnode_shift = 63;
-	memnodemap = memnode.embedded_map;
-	memnodemap[0] = 0;
-	memblock_x86_register_active_regions(0, 0, max_pfn);
 	init_memory_mapping_high();
 	setup_node_bootmem(0, 0, max_pfn << PAGE_SHIFT);
 	numa_init_array();
@@ -784,6 +780,9 @@ void __init initmem_init(void)
 		if (WARN_ON(nodes_empty(node_possible_map)))
 			continue;
 
+		if (numa_register_memblks() < 0)
+			continue;
+
 		if (!scan_nodes[i]())
 			return;
 	}

arch/x86/mm/srat_64.c

@@ -308,11 +308,6 @@ int __init acpi_scan_nodes(void)
 	if (acpi_numa <= 0)
 		return -1;
 
-	if (numa_register_memblks() < 0) {
-		bad_srat();
-		return -1;
-	}
-
 	/* for out of order entries in SRAT */
 	sort_node_map();
 	if (!nodes_cover_memory(numa_nodes)) {