[IA64] Simple memory hot-add for ia64.

First step to memory hotplug for ia64 (add only,
all new memory is added to node 0, does not use
ZONE_EASY_RECLAIM yet).

Signed-off-by: Yasunori Goto <y-goto@jp.fujitsu.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

1 files changed, 36 insertions, 0 deletions

diff --git a/arch/ia64/mm/init.c b/arch/ia64/mm/init.c
index e3215ba64ffd..b38b6d213c15 100644
--- a/arch/ia64/mm/init.c
+++ b/arch/ia64/mm/init.c
@@ -635,3 +635,39 @@ mem_init (void)
         ia32_mem_init();
 #endif
 }
+
+#ifdef CONFIG_MEMORY_HOTPLUG
+void online_page(struct page *page)
+{
+        ClearPageReserved(page);
+        set_page_count(page, 1);
+        __free_page(page);
+        totalram_pages++;
+        num_physpages++;
+}
+
+int add_memory(u64 start, u64 size)
+{
+        pg_data_t *pgdat;
+        struct zone *zone;
+        unsigned long start_pfn = start >> PAGE_SHIFT;
+        unsigned long nr_pages = size >> PAGE_SHIFT;
+        int ret;
+
+        pgdat = NODE_DATA(0);
+
+        zone = pgdat->node_zones + ZONE_NORMAL;
+        ret = __add_pages(zone, start_pfn, nr_pages);
+
+        if (ret)
+                printk("%s: Problem encountered in __add_pages() as ret=%d\n",
+                       __FUNCTION__,  ret);
+
+        return ret;
+}
+
+int remove_memory(u64 start, u64 size)
+{
+        return -EINVAL;
+}
+#endif