[PATCH] hot-add-mem x86_64: use CONFIG_MEMORY_HOTPLUG_RESERVE

The api for hot-add memory already has a construct for finding nodes based on
an address, memory_add_physaddr_to_nid.  This patch allows the fucntion to do
something besides return 0.  It uses the nodes_add infomation to lookup to
node info for a hot add event.

Signed-off-by: Keith Mannthey <kmannth@us.ibm.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Andi Kleen <ak@muc.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

2 files changed, 43 insertions, 34 deletions

diff --git a/arch/x86_64/mm/init.c b/arch/x86_64/mm/init.c
index 71ecbb3f3262..19c72520a868 100644
--- a/arch/x86_64/mm/init.c
+++ b/arch/x86_64/mm/init.c
@@ -474,12 +474,12 @@ int arch_add_memory(int nid, u64 start, u64 size)
         unsigned long nr_pages = size >> PAGE_SHIFT;
         int ret;
 
+        init_memory_mapping(start, (start + size -1));
+
         ret = __add_pages(zone, start_pfn, nr_pages);
         if (ret)
                 goto error;
 
-        init_memory_mapping(start, (start + size -1));
-
         return ret;
 error:
         printk("%s: Problem encountered in __add_pages!\n", __func__);
@@ -501,7 +501,16 @@ int memory_add_physaddr_to_nid(u64 start)
 EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
 #endif
 
-#else /* CONFIG_MEMORY_HOTPLUG */
+#ifndef CONFIG_ACPI_NUMA
+int memory_add_physaddr_to_nid(u64 start)
+{
+        return 0;
+}
+#endif
+
+#endif /* CONFIG_MEMORY_HOTPLUG */
+
+#ifdef CONFIG_MEMORY_HOTPLUG_RESERVE
 /*
  * Memory Hotadd without sparsemem. The mem_maps have been allocated in advance,
  * just online the pages.
@@ -527,7 +536,7 @@ int __add_pages(struct zone *z, unsigned long start_pfn, unsigned long nr_pages)
         }
         return err;
 }
-#endif /* CONFIG_MEMORY_HOTPLUG */
+#endif
 
 static struct kcore_list kcore_mem, kcore_vmalloc, kcore_kernel, kcore_modules,
                          kcore_vsyscall;
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 7666dbd328df..fd678a662eae 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -26,6 +26,36 @@
 
 #include <asm/tlbflush.h>
 
+/* add this memory to iomem resource */
+static struct resource *register_memory_resource(u64 start, u64 size)
+{
+        struct resource *res;
+        res = kzalloc(sizeof(struct resource), GFP_KERNEL);
+        BUG_ON(!res);
+
+        res->name = "System RAM";
+        res->start = start;
+        res->end = start + size - 1;
+        res->flags = IORESOURCE_MEM;
+        if (request_resource(&iomem_resource, res) < 0) {
+                printk("System RAM resource %llx - %llx cannot be added\n",
+                (unsigned long long)res->start, (unsigned long long)res->end);
+                kfree(res);
+                res = NULL;
+        }
+        return res;
+}
+
+static void release_memory_resource(struct resource *res)
+{
+        if (!res)
+                return;
+        release_resource(res);
+        kfree(res);
+        return;
+}
+
+
 #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
 static int __add_zone(struct zone *zone, unsigned long phys_start_pfn)
 {
@@ -223,36 +253,6 @@ static void rollback_node_hotadd(int nid, pg_data_t *pgdat)
         return;
 }
 
-/* add this memory to iomem resource */
-static struct resource *register_memory_resource(u64 start, u64 size)
-{
-        struct resource *res;
-        res = kzalloc(sizeof(struct resource), GFP_KERNEL);
-        BUG_ON(!res);
-
-        res->name = "System RAM";
-        res->start = start;
-        res->end = start + size - 1;
-        res->flags = IORESOURCE_MEM;
-        if (request_resource(&iomem_resource, res) < 0) {
-                printk("System RAM resource %llx - %llx cannot be added\n",
-                (unsigned long long)res->start, (unsigned long long)res->end);
-                kfree(res);
-                res = NULL;
-        }
-        return res;
-}
-
-static void release_memory_resource(struct resource *res)
-{
-        if (!res)
-                return;
-        release_resource(res);
-        kfree(res);
-        return;
-}
-
-
 
 int add_memory(int nid, u64 start, u64 size)
 {