diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
index e2c95fcb8055..4bd7b0a70996 100644
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c
@@ -200,6 +200,8 @@ void show_mem(void)
 		unsigned long flags;
 		pgdat_resize_lock(pgdat, &flags);
 		for (i = 0; i < pgdat->node_spanned_pages; i++) {
+			if (!pfn_valid(pgdat->node_start_pfn + i))
+				continue;
 			page = pgdat_page_nr(pgdat, i);
 			total++;
 			if (PageHighMem(page))
@@ -336,7 +338,7 @@ void __init mem_init(void)
 	struct page *page;
 	unsigned long reservedpages = 0, codesize, initsize, datasize, bsssize;
 
-	num_physpages = max_pfn;	/* RAM is assumed contiguous */
+	num_physpages = lmb.memory.size >> PAGE_SHIFT;
 	high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
 
 #ifdef CONFIG_NEED_MULTIPLE_NODES
@@ -348,11 +350,13 @@ void __init mem_init(void)
 		}
 	}
 #else
-	max_mapnr = num_physpages;
+	max_mapnr = max_pfn;
 	totalram_pages += free_all_bootmem();
 #endif
 	for_each_pgdat(pgdat) {
 		for (i = 0; i < pgdat->node_spanned_pages; i++) {
+			if (!pfn_valid(pgdat->node_start_pfn + i))
+				continue;
 			page = pgdat_page_nr(pgdat, i);
 			if (PageReserved(page))
 				reservedpages++;
diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c
index bd2cf1336885..f72cf87364cb 100644
--- a/arch/powerpc/mm/numa.c
+++ b/arch/powerpc/mm/numa.c
@@ -483,6 +483,7 @@ static void __init setup_nonnuma(void)
 {
 	unsigned long top_of_ram = lmb_end_of_DRAM();
 	unsigned long total_ram = lmb_phys_mem_size();
+	unsigned int i;
 
 	printk(KERN_INFO "Top of RAM: 0x%lx, Total RAM: 0x%lx\n",
 	       top_of_ram, total_ram);
@@ -490,7 +491,9 @@ static void __init setup_nonnuma(void)
 	       (top_of_ram - total_ram) >> 20);
 
 	map_cpu_to_node(boot_cpuid, 0);
-	add_region(0, 0, lmb_end_of_DRAM() >> PAGE_SHIFT);
+	for (i = 0; i < lmb.memory.cnt; ++i)
+		add_region(0, lmb.memory.region[i].base >> PAGE_SHIFT,
+			   lmb_size_pages(&lmb.memory, i));
 	node_set_online(0);
 }