[PATCH] ppc64: sparsemem memory model

Provide the architecture specific implementation for SPARSEMEM for PPC64
systems.

Signed-off-by: Andy Whitcroft <apw@shadowen.org>
Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
Signed-off-by: Mike Kravetz <kravetz@us.ibm.com> (in part)
Signed-off-by: Martin Bligh <mbligh@aracnet.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

4 files changed, 27 insertions, 7 deletions

diff --git a/arch/ppc64/Kconfig b/arch/ppc64/Kconfig
index c92d48fe06e5..6448231cb106 100644
--- a/arch/ppc64/Kconfig
+++ b/arch/ppc64/Kconfig
@@ -198,6 +198,13 @@ config HMT
           This option enables hardware multithreading on RS64 cpus.
           pSeries systems p620 and p660 have such a cpu type.
 
+config ARCH_SELECT_MEMORY_MODEL
+        def_bool y
+
+config ARCH_FLATMEM_ENABLE
+       def_bool y
+       depends on !NUMA
+
 config ARCH_DISCONTIGMEM_ENABLE
         def_bool y
         depends on SMP && PPC_PSERIES
@@ -209,6 +216,10 @@ config ARCH_DISCONTIGMEM_DEFAULT
 config ARCH_FLATMEM_ENABLE
         def_bool y
 
+config ARCH_SPARSEMEM_ENABLE
+        def_bool y
+        depends on ARCH_DISCONTIGMEM_ENABLE
+
 source "mm/Kconfig"
 
 config HAVE_ARCH_EARLY_PFN_TO_NID
@@ -229,7 +240,7 @@ config NODES_SPAN_OTHER_NODES
 
 config NUMA
         bool "NUMA support"
-        depends on DISCONTIGMEM
+        default y if DISCONTIGMEM || SPARSEMEM
 
 config SCHED_SMT
         bool "SMT (Hyperthreading) scheduler support"
diff --git a/arch/ppc64/kernel/setup.c b/arch/ppc64/kernel/setup.c
index 8e439a817642..9e70ac90dec1 100644
--- a/arch/ppc64/kernel/setup.c
+++ b/arch/ppc64/kernel/setup.c
@@ -1055,6 +1055,7 @@ void __init setup_arch(char **cmdline_p)
 
         /* set up the bootmem stuff with available memory */
         do_init_bootmem();
+        sparse_init();
 
         /* initialize the syscall map in systemcfg */
         setup_syscall_map();
diff --git a/arch/ppc64/mm/Makefile b/arch/ppc64/mm/Makefile
index ac522d57b2a7..3695d00d347f 100644
--- a/arch/ppc64/mm/Makefile
+++ b/arch/ppc64/mm/Makefile
@@ -6,6 +6,6 @@ EXTRA_CFLAGS += -mno-minimal-toc
 
 obj-y := fault.o init.o imalloc.o hash_utils.o hash_low.o tlb.o \
         slb_low.o slb.o stab.o mmap.o
-obj-$(CONFIG_DISCONTIGMEM) += numa.o
+obj-$(CONFIG_NEED_MULTIPLE_NODES) += numa.o
 obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o
 obj-$(CONFIG_PPC_MULTIPLATFORM) += hash_native.o
diff --git a/arch/ppc64/mm/init.c b/arch/ppc64/mm/init.c
index 29dbe084c21f..b50b3a446dbe 100644
--- a/arch/ppc64/mm/init.c
+++ b/arch/ppc64/mm/init.c
@@ -531,7 +531,7 @@ EXPORT_SYMBOL(page_is_ram);
  * Initialize the bootmem system and give it all the memory we
  * have available.
  */
-#ifndef CONFIG_DISCONTIGMEM
+#ifndef CONFIG_NEED_MULTIPLE_NODES
 void __init do_init_bootmem(void)
 {
         unsigned long i;
@@ -553,12 +553,20 @@ void __init do_init_bootmem(void)
 
         max_pfn = max_low_pfn;
 
-        /* add all physical memory to the bootmem map. Also find the first */
+        /* Add all physical memory to the bootmem map, mark each area
+         * present.
+         */
         for (i=0; i < lmb.memory.cnt; i++) {
                 unsigned long physbase, size;
+                unsigned long start_pfn, end_pfn;
 
                 physbase = lmb.memory.region[i].physbase;
                 size = lmb.memory.region[i].size;
+
+                start_pfn = physbase >> PAGE_SHIFT;
+                end_pfn = start_pfn + (size >> PAGE_SHIFT);
+                memory_present(0, start_pfn, end_pfn);
+
                 free_bootmem(physbase, size);
         }
 
@@ -597,7 +605,7 @@ void __init paging_init(void)
         free_area_init_node(0, NODE_DATA(0), zones_size,
                             __pa(PAGE_OFFSET) >> PAGE_SHIFT, zholes_size);
 }
-#endif /* CONFIG_DISCONTIGMEM */
+#endif /* ! CONFIG_NEED_MULTIPLE_NODES */
 
 static struct kcore_list kcore_vmem;
 
@@ -628,7 +636,7 @@ module_init(setup_kcore);
 
 void __init mem_init(void)
 {
-#ifdef CONFIG_DISCONTIGMEM
+#ifdef CONFIG_NEED_MULTIPLE_NODES
         int nid;
 #endif
         pg_data_t *pgdat;
@@ -639,7 +647,7 @@ void __init mem_init(void)
         num_physpages = max_low_pfn;    /* RAM is assumed contiguous */
         high_memory = (void *) __va(max_low_pfn * PAGE_SIZE);
 
-#ifdef CONFIG_DISCONTIGMEM
+#ifdef CONFIG_NEED_MULTIPLE_NODES
         for_each_online_node(nid) {
                 if (NODE_DATA(nid)->node_spanned_pages != 0) {
                         printk("freeing bootmem node %x\n", nid);