Merge branch 'linus'

13 files changed, 115 insertions, 187 deletions

diff --git a/arch/powerpc/mm/fault.c b/arch/powerpc/mm/fault.c
index a4815d31672..ec4adcb4bc2 100644
--- a/arch/powerpc/mm/fault.c
+++ b/arch/powerpc/mm/fault.c
@@ -1,6 +1,4 @@
 /*
- *  arch/ppc/mm/fault.c
- *
  *  PowerPC version
  *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
  *
diff --git a/arch/powerpc/mm/hash_low_32.S b/arch/powerpc/mm/hash_low_32.S
index 12ccd7155ba..ea469eefa14 100644
--- a/arch/powerpc/mm/hash_low_32.S
+++ b/arch/powerpc/mm/hash_low_32.S
@@ -1,6 +1,4 @@
 /*
- *  arch/ppc/kernel/hashtable.S
- *
  *  $Id: hashtable.S,v 1.6 1999/10/08 01:56:15 paulus Exp $
  *
  *  PowerPC version
diff --git a/arch/powerpc/mm/hash_utils_64.c b/arch/powerpc/mm/hash_utils_64.c
index e9d589eefc1..89b35c18131 100644
--- a/arch/powerpc/mm/hash_utils_64.c
+++ b/arch/powerpc/mm/hash_utils_64.c
@@ -169,7 +169,7 @@ int htab_bolt_mapping(unsigned long vstart, unsigned long vend,
 #ifdef CONFIG_PPC_ISERIES
 		if (_machine == PLATFORM_ISERIES_LPAR)
 			ret = iSeries_hpte_insert(hpteg, va,
-						  __pa(vaddr),
+						  paddr,
 						  tmp_mode,
 						  HPTE_V_BOLTED,
 						  psize);
@@ -178,7 +178,7 @@ int htab_bolt_mapping(unsigned long vstart, unsigned long vend,
 #ifdef CONFIG_PPC_PSERIES
 		if (_machine & PLATFORM_LPAR)
 			ret = pSeries_lpar_hpte_insert(hpteg, va,
-						       virt_to_abs(paddr),
+						       paddr,
 						       tmp_mode,
 						       HPTE_V_BOLTED,
 						       psize);
@@ -186,7 +186,7 @@ int htab_bolt_mapping(unsigned long vstart, unsigned long vend,
 #endif
 #ifdef CONFIG_PPC_MULTIPLATFORM
 			ret = native_hpte_insert(hpteg, va,
-						 virt_to_abs(paddr),
+						 paddr,
 						 tmp_mode, HPTE_V_BOLTED,
 						 psize);
 #endif
@@ -392,7 +392,7 @@ static unsigned long __init htab_get_table_size(void)
 #ifdef CONFIG_MEMORY_HOTPLUG
 void create_section_mapping(unsigned long start, unsigned long end)
 {
-		BUG_ON(htab_bolt_mapping(start, end, start,
+		BUG_ON(htab_bolt_mapping(start, end, __pa(start),
 			_PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_COHERENT | PP_RWXX,
 			mmu_linear_psize));
 }
@@ -422,7 +422,7 @@ void __init htab_initialize(void)
 
 	htab_hash_mask = pteg_count - 1;
 
-	if (platform_is_lpar()) {
+	if (firmware_has_feature(FW_FEATURE_LPAR)) {
 		/* Using a hypervisor which owns the htab */
 		htab_address = NULL;
 		_SDR1 = 0; 
@@ -431,7 +431,6 @@ void __init htab_initialize(void)
 		 * the absolute address space.
 		 */
 		table = lmb_alloc(htab_size_bytes, htab_size_bytes);
-		BUG_ON(table == 0);
 
 		DBG("Hash table allocated at %lx, size: %lx\n", table,
 		    htab_size_bytes);
@@ -474,21 +473,22 @@ void __init htab_initialize(void)
 
 		if (dart_tablebase != 0 && dart_tablebase >= base
 		    && dart_tablebase < (base + size)) {
+			unsigned long dart_table_end = dart_tablebase + 16 * MB;
 			if (base != dart_tablebase)
 				BUG_ON(htab_bolt_mapping(base, dart_tablebase,
-							 base, mode_rw,
-							 mmu_linear_psize));
-			if ((base + size) > (dart_tablebase + 16*MB))
+							__pa(base), mode_rw,
+							mmu_linear_psize));
+			if ((base + size) > dart_table_end)
 				BUG_ON(htab_bolt_mapping(dart_tablebase+16*MB,
-							 base + size,
-							 dart_tablebase+16*MB,
+							base + size,
+							__pa(dart_table_end),
 							 mode_rw,
 							 mmu_linear_psize));
 			continue;
 		}
 #endif /* CONFIG_U3_DART */
-		BUG_ON(htab_bolt_mapping(base, base + size, base,
-					 mode_rw, mmu_linear_psize));
+		BUG_ON(htab_bolt_mapping(base, base + size, __pa(base),
+					mode_rw, mmu_linear_psize));
        }
 
 	/*
@@ -505,8 +505,8 @@ void __init htab_initialize(void)
 		if (base + size >= tce_alloc_start)
 			tce_alloc_start = base + size + 1;
 
- 		BUG_ON(htab_bolt_mapping(tce_alloc_start, tce_alloc_end,
- 					 tce_alloc_start, mode_rw,
+		BUG_ON(htab_bolt_mapping(tce_alloc_start, tce_alloc_end,
+					 __pa(tce_alloc_start), mode_rw,
 					 mmu_linear_psize));
 	}
 
@@ -517,7 +517,7 @@ void __init htab_initialize(void)
 
 void htab_initialize_secondary(void)
 {
-	if (!platform_is_lpar())
+	if (!firmware_has_feature(FW_FEATURE_LPAR))
 		mtspr(SPRN_SDR1, _SDR1);
 }
 
diff --git a/arch/powerpc/mm/hugetlbpage.c b/arch/powerpc/mm/hugetlbpage.c
index b51bb28c054..7370f9f33e2 100644
--- a/arch/powerpc/mm/hugetlbpage.c
+++ b/arch/powerpc/mm/hugetlbpage.c
@@ -133,21 +133,6 @@ pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
 	return __pte(old);
 }
 
-/*
- * This function checks for proper alignment of input addr and len parameters.
- */
-int is_aligned_hugepage_range(unsigned long addr, unsigned long len)
-{
-	if (len & ~HPAGE_MASK)
-		return -EINVAL;
-	if (addr & ~HPAGE_MASK)
-		return -EINVAL;
-	if (! (within_hugepage_low_range(addr, len)
-	       || within_hugepage_high_range(addr, len)) )
-		return -EINVAL;
-	return 0;
-}
-
 struct slb_flush_info {
 	struct mm_struct *mm;
 	u16 newareas;
diff --git a/arch/powerpc/mm/init_32.c b/arch/powerpc/mm/init_32.c
index 7d0d75c1184..b57fb3a2b7b 100644
--- a/arch/powerpc/mm/init_32.c
+++ b/arch/powerpc/mm/init_32.c
@@ -216,7 +216,7 @@ static void free_sec(unsigned long start, unsigned long end, const char *name)
 
 	while (start < end) {
 		ClearPageReserved(virt_to_page(start));
-		set_page_count(virt_to_page(start), 1);
+		init_page_count(virt_to_page(start));
 		free_page(start);
 		cnt++;
 		start += PAGE_SIZE;
@@ -248,7 +248,7 @@ void free_initrd_mem(unsigned long start, unsigned long end)
 		printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
 	for (; start < end; start += PAGE_SIZE) {
 		ClearPageReserved(virt_to_page(start));
-		set_page_count(virt_to_page(start), 1);
+		init_page_count(virt_to_page(start));
 		free_page(start);
 		totalram_pages++;
 	}
diff --git a/arch/powerpc/mm/init_64.c b/arch/powerpc/mm/init_64.c
index 81cfb0c2ec5..babebd15bdc 100644
--- a/arch/powerpc/mm/init_64.c
+++ b/arch/powerpc/mm/init_64.c
@@ -84,54 +84,6 @@
 /* max amount of RAM to use */
 unsigned long __max_memory;
 
-/* info on what we think the IO hole is */
-unsigned long 	io_hole_start;
-unsigned long	io_hole_size;
-
-/*
- * Do very early mm setup.
- */
-void __init mm_init_ppc64(void)
-{
-#ifndef CONFIG_PPC_ISERIES
-	unsigned long i;
-#endif
-
-	ppc64_boot_msg(0x100, "MM Init");
-
-	/* This is the story of the IO hole... please, keep seated,
-	 * unfortunately, we are out of oxygen masks at the moment.
-	 * So we need some rough way to tell where your big IO hole
-	 * is. On pmac, it's between 2G and 4G, on POWER3, it's around
-	 * that area as well, on POWER4 we don't have one, etc...
-	 * We need that as a "hint" when sizing the TCE table on POWER3
-	 * So far, the simplest way that seem work well enough for us it
-	 * to just assume that the first discontinuity in our physical
-	 * RAM layout is the IO hole. That may not be correct in the future
-	 * (and isn't on iSeries but then we don't care ;)
-	 */
-
-#ifndef CONFIG_PPC_ISERIES
-	for (i = 1; i < lmb.memory.cnt; i++) {
-		unsigned long base, prevbase, prevsize;
-
-		prevbase = lmb.memory.region[i-1].base;
-		prevsize = lmb.memory.region[i-1].size;
-		base = lmb.memory.region[i].base;
-		if (base > (prevbase + prevsize)) {
-			io_hole_start = prevbase + prevsize;
-			io_hole_size = base  - (prevbase + prevsize);
-			break;
-		}
-	}
-#endif /* CONFIG_PPC_ISERIES */
-	if (io_hole_start)
-		printk("IO Hole assumed to be %lx -> %lx\n",
-		       io_hole_start, io_hole_start + io_hole_size - 1);
-
-	ppc64_boot_msg(0x100, "MM Init Done");
-}
-
 void free_initmem(void)
 {
 	unsigned long addr;
@@ -140,7 +92,7 @@ void free_initmem(void)
 	for (; addr < (unsigned long)__init_end; addr += PAGE_SIZE) {
 		memset((void *)addr, 0xcc, PAGE_SIZE);
 		ClearPageReserved(virt_to_page(addr));
-		set_page_count(virt_to_page(addr), 1);
+		init_page_count(virt_to_page(addr));
 		free_page(addr);
 		totalram_pages++;
 	}
@@ -155,7 +107,7 @@ void free_initrd_mem(unsigned long start, unsigned long end)
 		printk ("Freeing initrd memory: %ldk freed\n", (end - start) >> 10);
 	for (; start < end; start += PAGE_SIZE) {
 		ClearPageReserved(virt_to_page(start));
-		set_page_count(virt_to_page(start), 1);
+		init_page_count(virt_to_page(start));
 		free_page(start);
 		totalram_pages++;
 	}
diff --git a/arch/powerpc/mm/lmb.c b/arch/powerpc/mm/lmb.c
index bbe3eac918e..417d5851855 100644
--- a/arch/powerpc/mm/lmb.c
+++ b/arch/powerpc/mm/lmb.c
@@ -31,6 +31,8 @@
 #define DBG(fmt...)
 #endif
 
+#define LMB_ALLOC_ANYWHERE	0
+
 struct lmb lmb;
 
 void lmb_dump_all(void)
@@ -226,6 +228,20 @@ unsigned long __init lmb_alloc(unsigned long size, unsigned long align)
 unsigned long __init lmb_alloc_base(unsigned long size, unsigned long align,
 				    unsigned long max_addr)
 {
+	unsigned long alloc;
+
+	alloc = __lmb_alloc_base(size, align, max_addr);
+
+	if (alloc == 0)
+		panic("ERROR: Failed to allocate 0x%lx bytes below 0x%lx.\n",
+				size, max_addr);
+
+	return alloc;
+}
+
+unsigned long __init __lmb_alloc_base(unsigned long size, unsigned long align,
+				    unsigned long max_addr)
+{
 	long i, j;
 	unsigned long base = 0;
 
diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
index 550517c2dd4..badac10d700 100644
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c
@@ -108,8 +108,8 @@ EXPORT_SYMBOL(phys_mem_access_prot);
 void online_page(struct page *page)
 {
 	ClearPageReserved(page);
-	set_page_count(page, 0);
-	free_cold_page(page);
+	init_page_count(page);
+	__free_page(page);
 	totalram_pages++;
 	num_physpages++;
 }
@@ -125,7 +125,7 @@ int __devinit add_memory(u64 start, u64 size)
 	nid = hot_add_scn_to_nid(start);
 	pgdata = NODE_DATA(nid);
 
-	start = __va(start);
+	start = (unsigned long)__va(start);
 	create_section_mapping(start, start + size);
 
 	/* this should work for most non-highmem platforms */
@@ -249,7 +249,6 @@ void __init do_init_bootmem(void)
 	bootmap_pages = bootmem_bootmap_pages(total_pages);
 
 	start = lmb_alloc(bootmap_pages << PAGE_SHIFT, PAGE_SIZE);
-	BUG_ON(!start);
 
 	boot_mapsize = init_bootmem(start >> PAGE_SHIFT, total_pages);
 
@@ -376,7 +375,7 @@ void __init mem_init(void)
 			struct page *page = pfn_to_page(pfn);
 
 			ClearPageReserved(page);
-			set_page_count(page, 1);
+			init_page_count(page);
 			__free_page(page);
 			totalhigh_pages++;
 		}
diff --git a/arch/powerpc/mm/mmap.c b/arch/powerpc/mm/mmap.c
index fe65f522aff..972a8e884b9 100644
--- a/arch/powerpc/mm/mmap.c
+++ b/arch/powerpc/mm/mmap.c
@@ -1,6 +1,4 @@
 /*
- *  linux/arch/ppc64/mm/mmap.c
- *
  *  flexible mmap layout support
  *
  * Copyright 2003-2004 Red Hat Inc., Durham, North Carolina.
diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c
index 2863a912bcd..e89b22aa539 100644
--- a/arch/powerpc/mm/numa.c
+++ b/arch/powerpc/mm/numa.c
@@ -129,10 +129,12 @@ void __init get_region(unsigned int nid, unsigned long *start_pfn,
 		*start_pfn = 0;
 }
 
-static inline void map_cpu_to_node(int cpu, int node)
+static void __cpuinit map_cpu_to_node(int cpu, int node)
 {
 	numa_cpu_lookup_table[cpu] = node;
 
+	dbg("adding cpu %d to node %d\n", cpu, node);
+
 	if (!(cpu_isset(cpu, numa_cpumask_lookup_table[node])))
 		cpu_set(cpu, numa_cpumask_lookup_table[node]);
 }
@@ -153,7 +155,7 @@ static void unmap_cpu_from_node(unsigned long cpu)
 }
 #endif /* CONFIG_HOTPLUG_CPU */
 
-static struct device_node *find_cpu_node(unsigned int cpu)
+static struct device_node * __cpuinit find_cpu_node(unsigned int cpu)
 {
 	unsigned int hw_cpuid = get_hard_smp_processor_id(cpu);
 	struct device_node *cpu_node = NULL;
@@ -189,23 +191,29 @@ static int *of_get_associativity(struct device_node *dev)
 	return (unsigned int *)get_property(dev, "ibm,associativity", NULL);
 }
 
-static int of_node_numa_domain(struct device_node *device)
+/* Returns nid in the range [0..MAX_NUMNODES-1], or -1 if no useful numa
+ * info is found.
+ */
+static int of_node_to_nid(struct device_node *device)
 {
-	int numa_domain;
+	int nid = -1;
 	unsigned int *tmp;
 
 	if (min_common_depth == -1)
-		return 0;
+		goto out;
 
 	tmp = of_get_associativity(device);
-	if (tmp && (tmp[0] >= min_common_depth)) {
-		numa_domain = tmp[min_common_depth];
-	} else {
-		dbg("WARNING: no NUMA information for %s\n",
-		    device->full_name);
-		numa_domain = 0;
-	}
-	return numa_domain;
+	if (!tmp)
+		goto out;
+
+	if (tmp[0] >= min_common_depth)
+		nid = tmp[min_common_depth];
+
+	/* POWER4 LPAR uses 0xffff as invalid node */
+	if (nid == 0xffff || nid >= MAX_NUMNODES)
+		nid = -1;
+out:
+	return nid;
 }
 
 /*
@@ -246,8 +254,7 @@ static int __init find_min_common_depth(void)
 	if ((len >= 1) && ref_points) {
 		depth = ref_points[1];
 	} else {
-		dbg("WARNING: could not find NUMA "
-		    "associativity reference point\n");
+		dbg("NUMA: ibm,associativity-reference-points not found.\n");
 		depth = -1;
 	}
 	of_node_put(rtas_root);
@@ -283,9 +290,9 @@ static unsigned long __devinit read_n_cells(int n, unsigned int **buf)
  * Figure out to which domain a cpu belongs and stick it there.
  * Return the id of the domain used.
  */
-static int numa_setup_cpu(unsigned long lcpu)
+static int __cpuinit numa_setup_cpu(unsigned long lcpu)
 {
-	int numa_domain = 0;
+	int nid = 0;
 	struct device_node *cpu = find_cpu_node(lcpu);
 
 	if (!cpu) {
@@ -293,27 +300,16 @@ static int numa_setup_cpu(unsigned long lcpu)
 		goto out;
 	}
 
-	numa_domain = of_node_numa_domain(cpu);
+	nid = of_node_to_nid(cpu);
 
-	if (numa_domain >= num_online_nodes()) {
-		/*
-		 * POWER4 LPAR uses 0xffff as invalid node,
-		 * dont warn in this case.
-		 */
-		if (numa_domain != 0xffff)
-			printk(KERN_ERR "WARNING: cpu %ld "
-			       "maps to invalid NUMA node %d\n",
-			       lcpu, numa_domain);
-		numa_domain = 0;
-	}
+	if (nid < 0 || !node_online(nid))
+		nid = any_online_node(NODE_MASK_ALL);
 out:
-	node_set_online(numa_domain);
-
-	map_cpu_to_node(lcpu, numa_domain);
+	map_cpu_to_node(lcpu, nid);
 
 	of_node_put(cpu);
 
-	return numa_domain;
+	return nid;
 }
 
 static int cpu_numa_callback(struct notifier_block *nfb,
@@ -325,10 +321,7 @@ static int cpu_numa_callback(struct notifier_block *nfb,
 
 	switch (action) {
 	case CPU_UP_PREPARE:
-		if (min_common_depth == -1 || !numa_enabled)
-			map_cpu_to_node(lcpu, 0);
-		else
-			numa_setup_cpu(lcpu);
+		numa_setup_cpu(lcpu);
 		ret = NOTIFY_OK;
 		break;
 #ifdef CONFIG_HOTPLUG_CPU
@@ -375,7 +368,7 @@ static int __init parse_numa_properties(void)
 {
 	struct device_node *cpu = NULL;
 	struct device_node *memory = NULL;
-	int max_domain;
+	int default_nid = 0;
 	unsigned long i;
 
 	if (numa_enabled == 0) {
@@ -385,32 +378,32 @@ static int __init parse_numa_properties(void)
 
 	min_common_depth = find_min_common_depth();
 
-	dbg("NUMA associativity depth for CPU/Memory: %d\n", min_common_depth);
 	if (min_common_depth < 0)
 		return min_common_depth;
 
-	max_domain = numa_setup_cpu(boot_cpuid);
+	dbg("NUMA associativity depth for CPU/Memory: %d\n", min_common_depth);
 
 	/*
-	 * Even though we connect cpus to numa domains later in SMP init,
-	 * we need to know the maximum node id now. This is because each
-	 * node id must have NODE_DATA etc backing it.
-	 * As a result of hotplug we could still have cpus appear later on
-	 * with larger node ids. In that case we force the cpu into node 0.
+	 * Even though we connect cpus to numa domains later in SMP
+	 * init, we need to know the node ids now. This is because
+	 * each node to be onlined must have NODE_DATA etc backing it.
 	 */
-	for_each_cpu(i) {
-		int numa_domain;
+	for_each_present_cpu(i) {
+		int nid;
 
 		cpu = find_cpu_node(i);
+		BUG_ON(!cpu);
+		nid = of_node_to_nid(cpu);
+		of_node_put(cpu);
 
-		if (cpu) {
-			numa_domain = of_node_numa_domain(cpu);
-			of_node_put(cpu);
-
-			if (numa_domain < MAX_NUMNODES &&
-			    max_domain < numa_domain)
-				max_domain = numa_domain;
-		}
+		/*
+		 * Don't fall back to default_nid yet -- we will plug
+		 * cpus into nodes once the memory scan has discovered
+		 * the topology.
+		 */
+		if (nid < 0)
+			continue;
+		node_set_online(nid);
 	}
 
 	get_n_mem_cells(&n_mem_addr_cells, &n_mem_size_cells);
@@ -418,7 +411,7 @@ static int __init parse_numa_properties(void)
 	while ((memory = of_find_node_by_type(memory, "memory")) != NULL) {
 		unsigned long start;
 		unsigned long size;
-		int numa_domain;
+		int nid;
 		int ranges;
 		unsigned int *memcell_buf;
 		unsigned int len;
@@ -439,18 +432,15 @@ new_range:
 		start = read_n_cells(n_mem_addr_cells, &memcell_buf);
 		size = read_n_cells(n_mem_size_cells, &memcell_buf);
 
-		numa_domain = of_node_numa_domain(memory);
-
-		if (numa_domain >= MAX_NUMNODES) {
-			if (numa_domain != 0xffff)
-				printk(KERN_ERR "WARNING: memory at %lx maps "
-				       "to invalid NUMA node %d\n", start,
-				       numa_domain);
-			numa_domain = 0;
-		}
-
-		if (max_domain < numa_domain)
-			max_domain = numa_domain;
+		/*
+		 * Assumption: either all memory nodes or none will
+		 * have associativity properties.  If none, then
+		 * everything goes to default_nid.
+		 */
+		nid = of_node_to_nid(memory);
+		if (nid < 0)
+			nid = default_nid;
+		node_set_online(nid);
 
 		if (!(size = numa_enforce_memory_limit(start, size))) {
 			if (--ranges)
@@ -459,16 +449,13 @@ new_range:
 				continue;
 		}
 
-		add_region(numa_domain, start >> PAGE_SHIFT,
+		add_region(nid, start >> PAGE_SHIFT,
 			   size >> PAGE_SHIFT);
 
 		if (--ranges)
 			goto new_range;
 	}
 
-	for (i = 0; i <= max_domain; i++)
-		node_set_online(i);
-
 	return 0;
 }
 
@@ -483,7 +470,6 @@ static void __init setup_nonnuma(void)
 	printk(KERN_INFO "Memory hole size: %ldMB\n",
 	       (top_of_ram - total_ram) >> 20);
 
-	map_cpu_to_node(boot_cpuid, 0);
 	for (i = 0; i < lmb.memory.cnt; ++i)
 		add_region(0, lmb.memory.region[i].base >> PAGE_SHIFT,
 			   lmb_size_pages(&lmb.memory, i));
@@ -570,11 +556,11 @@ static void __init *careful_allocation(int nid, unsigned long size,
 				       unsigned long end_pfn)
 {
 	int new_nid;
-	unsigned long ret = lmb_alloc_base(size, align, end_pfn << PAGE_SHIFT);
+	unsigned long ret = __lmb_alloc_base(size, align, end_pfn << PAGE_SHIFT);
 
 	/* retry over all memory */
 	if (!ret)
-		ret = lmb_alloc_base(size, align, lmb_end_of_DRAM());
+		ret = __lmb_alloc_base(size, align, lmb_end_of_DRAM());
 
 	if (!ret)
 		panic("numa.c: cannot allocate %lu bytes on node %d",
@@ -620,6 +606,8 @@ void __init do_init_bootmem(void)
 		dump_numa_memory_topology();
 
 	register_cpu_notifier(&ppc64_numa_nb);
+	cpu_numa_callback(&ppc64_numa_nb, CPU_UP_PREPARE,
+			  (void *)(unsigned long)boot_cpuid);
 
 	for_each_online_node(nid) {
 		unsigned long start_pfn, end_pfn, pages_present;
@@ -767,10 +755,10 @@ int hot_add_scn_to_nid(unsigned long scn_addr)
 {
 	struct device_node *memory = NULL;
 	nodemask_t nodes;
-	int numa_domain = 0;
+	int default_nid = any_online_node(NODE_MASK_ALL);
 
 	if (!numa_enabled || (min_common_depth < 0))
-		return numa_domain;
+		return default_nid;
 
 	while ((memory = of_find_node_by_type(memory, "memory")) != NULL) {
 		unsigned long start, size;
@@ -787,15 +775,15 @@ int hot_add_scn_to_nid(unsigned long scn_addr)
 ha_new_range:
 		start = read_n_cells(n_mem_addr_cells, &memcell_buf);
 		size = read_n_cells(n_mem_size_cells, &memcell_buf);
-		numa_domain = of_node_numa_domain(memory);
+		nid = of_node_to_nid(memory);
 
 		/* Domains not present at boot default to 0 */
-		if (!node_online(numa_domain))
-			numa_domain = any_online_node(NODE_MASK_ALL);
+		if (nid < 0 || !node_online(nid))
+			nid = default_nid;
 
 		if ((scn_addr >= start) && (scn_addr < (start + size))) {
 			of_node_put(memory);
-			goto got_numa_domain;
+			goto got_nid;
 		}
 
 		if (--ranges)		/* process all ranges in cell */
@@ -804,12 +792,12 @@ ha_new_range:
 	BUG();	/* section address should be found above */
 
 	/* Temporary code to ensure that returned node is not empty */
-got_numa_domain:
+got_nid:
 	nodes_setall(nodes);
-	while (NODE_DATA(numa_domain)->node_spanned_pages == 0) {
-		node_clear(numa_domain, nodes);
-		numa_domain = any_online_node(nodes);
+	while (NODE_DATA(nid)->node_spanned_pages == 0) {
+		node_clear(nid, nodes);
+		nid = any_online_node(nodes);
 	}
-	return numa_domain;
+	return nid;
 }
 #endif /* CONFIG_MEMORY_HOTPLUG */
diff --git a/arch/powerpc/mm/slb_low.S b/arch/powerpc/mm/slb_low.S
index d1acee38f16..abfaabf667b 100644
--- a/arch/powerpc/mm/slb_low.S
+++ b/arch/powerpc/mm/slb_low.S
@@ -1,6 +1,4 @@
 /*
- * arch/ppc64/mm/slb_low.S
- *
  * Low-level SLB routines
  *
  * Copyright (C) 2004 David Gibson <dwg@au.ibm.com>, IBM
diff --git a/arch/powerpc/mm/stab.c b/arch/powerpc/mm/stab.c
index 82e4951826b..91d25fb27f8 100644
--- a/arch/powerpc/mm/stab.c
+++ b/arch/powerpc/mm/stab.c
@@ -247,10 +247,6 @@ void stabs_alloc(void)
 
 		newstab = lmb_alloc_base(HW_PAGE_SIZE, HW_PAGE_SIZE,
 					 1<<SID_SHIFT);
-		if (! newstab)
-			panic("Unable to allocate segment table for CPU %d.\n",
-			      cpu);
-
 		newstab = (unsigned long)__va(newstab);
 
 		memset((void *)newstab, 0, HW_PAGE_SIZE);
diff --git a/arch/powerpc/mm/tlb_64.c b/arch/powerpc/mm/tlb_64.c
index bb3afb6e631..f734b11566c 100644
--- a/arch/powerpc/mm/tlb_64.c
+++ b/arch/powerpc/mm/tlb_64.c
@@ -36,7 +36,7 @@
 DEFINE_PER_CPU(struct ppc64_tlb_batch, ppc64_tlb_batch);
 
 /* This is declared as we are using the more or less generic
- * include/asm-ppc64/tlb.h file -- tgall
+ * include/asm-powerpc/tlb.h file -- tgall
  */
 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
 DEFINE_PER_CPU(struct pte_freelist_batch *, pte_freelist_cur);