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 a4815d316722..ec4adcb4bc28 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 12ccd7155bac..ea469eefa146 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 e9d589eefc14..89b35c181314 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 b51bb28c054b..7370f9f33e29 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 7d0d75c11848..b57fb3a2b7bb 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 81cfb0c2ec58..babebd15bdc4 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 bbe3eac918e8..417d58518558 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 550517c2dd42..badac10d700c 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 fe65f522aff3..972a8e884b9a 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 2863a912bcd0..e89b22aa539e 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 d1acee38f163..abfaabf667bf 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 82e4951826bc..91d25fb27f89 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 bb3afb6e6317..f734b11566c2 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);