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>

1 files changed, 6 insertions, 23 deletions

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);