powerpc/mm: Eliminate unneeded for_each_memblock

The only persistent change made by this loop is calling
memblock_set_node() once for each memblock, which is not useful (and has
no effect) as memblock_set_node() is not called with any
memblock-specific parameters.

Subsistute a single memblock_set_node().
Signed-off-by: Cody P Schafer <cody@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

arch/powerpc/mm/mem.c

@@ -195,13 +195,10 @@ void __init do_init_bootmem(void)
 	min_low_pfn = MEMORY_START >> PAGE_SHIFT;
 	boot_mapsize = init_bootmem_node(NODE_DATA(0), start >> PAGE_SHIFT, min_low_pfn, max_low_pfn);
 
-	/* Add active regions with valid PFNs */
-	for_each_memblock(memory, reg) {
-		unsigned long start_pfn, end_pfn;
-		start_pfn = memblock_region_memory_base_pfn(reg);
-		end_pfn = memblock_region_memory_end_pfn(reg);
-		memblock_set_node(0, (phys_addr_t)ULLONG_MAX, 0);
-	}
+	/* Place all memblock_regions in the same node and merge contiguous
+	 * memblock_regions
+	 */
+	memblock_set_node(0, (phys_addr_t)ULLONG_MAX, 0);
 
 	/* Add all physical memory to the bootmem map, mark each area
 	 * present.