sh: sparsemem support.

This implements basic sparsemem support for SH. Presently this only
uses static sparsemem, and we still permit explicit selection of
flatmem. Those boards that want sparsemem can select it as usual.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

3 files changed, 22 insertions, 25 deletions

diff --git a/arch/sh/kernel/setup.c b/arch/sh/kernel/setup.c
index 6f1ea9b33374..3241a6274b81 100644
--- a/arch/sh/kernel/setup.c
+++ b/arch/sh/kernel/setup.c
@@ -128,6 +128,7 @@ void __init setup_bootmem_allocator(unsigned long start_pfn)
         bootmap_size = init_bootmem_node(NODE_DATA(0), start_pfn,
                                          min_low_pfn, max_low_pfn);
 
+        add_active_range(0, min_low_pfn, max_low_pfn);
         register_bootmem_low_pages();
 
         node_set_online(0);
@@ -192,6 +193,7 @@ static void __init setup_memory(void)
          */
         start_pfn = PFN_UP(__pa(_end));
         setup_bootmem_allocator(start_pfn);
+        sparse_memory_present_with_active_regions(0);
 }
 #else
 extern void __init setup_memory(void);
@@ -250,8 +252,9 @@ void __init setup_arch(char **cmdline_p)
         min_low_pfn = __MEMORY_START >> PAGE_SHIFT;
 
         nodes_clear(node_online_map);
+
+        /* Setup bootmem with available RAM */
         setup_memory();
-        paging_init();
         sparse_init();
 
 #ifdef CONFIG_DUMMY_CONSOLE
@@ -261,8 +264,9 @@ void __init setup_arch(char **cmdline_p)
         /* Perform the machine specific initialisation */
         if (likely(sh_mv.mv_setup))
                 sh_mv.mv_setup(cmdline_p);
-}
 
+        paging_init();
+}
 
 static const char *cpu_name[] = {
         [CPU_SH7206]    = "SH7206",     [CPU_SH7619]    = "SH7619",
diff --git a/arch/sh/mm/Kconfig b/arch/sh/mm/Kconfig
index 00f64c41edba..46fd212b3ed6 100644
--- a/arch/sh/mm/Kconfig
+++ b/arch/sh/mm/Kconfig
@@ -300,6 +300,13 @@ config NODES_SHIFT
 config ARCH_FLATMEM_ENABLE
         def_bool y
 
+config ARCH_SPARSEMEM_ENABLE
+        def_bool y
+        select SPARSEMEM_STATIC
+
+config ARCH_SPARSEMEM_DEFAULT
+        def_bool y
+
 config MAX_ACTIVE_REGIONS
         int
         default "1"
@@ -307,6 +314,9 @@ config MAX_ACTIVE_REGIONS
 config ARCH_POPULATES_NODE_MAP
         def_bool y
 
+config ARCH_SELECT_MEMORY_MODEL
+        def_bool y
+
 choice
         prompt "Kernel page size"
         default PAGE_SIZE_4KB
diff --git a/arch/sh/mm/init.c b/arch/sh/mm/init.c
index e0e644ff3204..1589466f9f87 100644
--- a/arch/sh/mm/init.c
+++ b/arch/sh/mm/init.c
@@ -36,14 +36,11 @@ void show_mem(void)
         show_free_areas();
 
         for_each_online_pgdat(pgdat) {
-                struct page *page, *end;
-                unsigned long flags;
+                unsigned long flags, i;
 
                 pgdat_resize_lock(pgdat, &flags);
-                page = pgdat->node_mem_map;
-                end = page + pgdat->node_spanned_pages;
-
-                do {
+                for (i = 0; i < pgdat->node_spanned_pages; i++) {
+                        struct page *page = pgdat_page_nr(pgdat, i);
                         total++;
                         if (PageReserved(page))
                                 reserved++;
@@ -55,9 +52,7 @@ void show_mem(void)
                                 free++;
                         else
                                 shared += page_count(page) - 1;
-                        page++;
-                } while (page < end);
-
+                }
                 pgdat_resize_unlock(pgdat, &flags);
         }
 
@@ -169,15 +164,11 @@ void __init paging_init(void)
                 low = pgdat->bdata->node_low_pfn;
 
                 max_zone_pfns[ZONE_NORMAL] = low;
-                add_active_range(nid, start_pfn, low);
 
                 printk("Node %u: start_pfn = 0x%lx, low = 0x%lx\n",
                        nid, start_pfn, low);
 
                 free_area_init_nodes(max_zone_pfns);
-
-                printk("Node %u: mem_map starts at %p\n",
-                       pgdat->node_id, pgdat->node_mem_map);
         }
 }
 
@@ -185,16 +176,13 @@ static struct kcore_list kcore_mem, kcore_vmalloc;
 
 void __init mem_init(void)
 {
-        int codesize, reservedpages, datasize, initsize;
+        int codesize, datasize, initsize;
         int nid;
 
-        reservedpages = 0;
-
         for_each_online_node(nid) {
                 pg_data_t *pgdat = NODE_DATA(nid);
                 unsigned long node_pages = 0;
                 void *node_high_memory;
-                int i;
 
                 num_physpages += pgdat->node_present_pages;
 
@@ -203,10 +191,6 @@ void __init mem_init(void)
 
                 totalram_pages += node_pages;
 
-                for (i = 0; i < node_pages; i++)
-                        if (PageReserved(pgdat->node_mem_map + i))
-                                reservedpages++;
-
                 node_high_memory = (void *)((pgdat->node_start_pfn +
                                              pgdat->node_spanned_pages) <<
                                                 PAGE_SHIFT);
@@ -239,11 +223,10 @@ void __init mem_init(void)
                    VMALLOC_END - VMALLOC_START);
 
         printk(KERN_INFO "Memory: %luk/%luk available (%dk kernel code, "
-               "%dk reserved, %dk data, %dk init)\n",
+               "%dk data, %dk init)\n",
                 (unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
                 totalram_pages << (PAGE_SHIFT-10),
                 codesize >> 10,
-                reservedpages << (PAGE_SHIFT-10),
                 datasize >> 10,
                 initsize >> 10);