x86-64, NUMA: Simplify hotplug node handling in acpi_numa_memory_affinity_init()

Hotplug node handling in acpi_numa_memory_affinity_init() was
unnecessarily complicated with storing the original nodes[] entry and
restoring it afterwards.  Simplify it by not modifying the nodes[]
entry for hotplug nodes from the beginning.
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/mm/srat_64.c

@@ -251,7 +251,7 @@ update_nodes_add(int node, unsigned long start, unsigned long end)
 void __init
 acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
 {
-	struct bootnode *nd, oldnode;
+	struct bootnode *nd;
 	unsigned long start, end;
 	int node, pxm;
 	int i;
@@ -289,8 +289,12 @@ acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
 		bad_srat();
 		return;
 	}
+
+	printk(KERN_INFO "SRAT: Node %u PXM %u %lx-%lx\n", node, pxm,
+	       start, end);
+
+	if (!(ma->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE)) {
 		nd = &nodes[node];
-	oldnode = *nd;
 		if (!node_test_and_set(node, nodes_parsed)) {
 			nd->start = start;
 			nd->end = end;
@@ -300,17 +304,8 @@ acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
 			if (nd->end < end)
 				nd->end = end;
 		}
-
-	printk(KERN_INFO "SRAT: Node %u PXM %u %lx-%lx\n", node, pxm,
-	       start, end);
-
-	if (ma->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE) {
+	} else
 		update_nodes_add(node, start, end);
-		/* restore nodes[node] */
-		*nd = oldnode;
-		if ((nd->start | nd->end) == 0)
-			node_clear(node, nodes_parsed);
-	}
 
 	node_memblk_range[num_node_memblks].start = start;
 	node_memblk_range[num_node_memblks].end = end;