Merge tag 'v2.6.38' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6

[mv-sheeva.git] / mm / memory_hotplug.c

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 9260314a221e0720d5cc3ecf5f00325c7ec3fba6..321fc7455df7328c08441b54300054ff963e487b 100644 (file)
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -34,6 +34,23 @@
 
 #include "internal.h"
 
+DEFINE_MUTEX(mem_hotplug_mutex);
+
+void lock_memory_hotplug(void)
+{
+       mutex_lock(&mem_hotplug_mutex);
+
+       /* for exclusive hibernation if CONFIG_HIBERNATION=y */
+       lock_system_sleep();
+}
+
+void unlock_memory_hotplug(void)
+{
+       unlock_system_sleep();
+       mutex_unlock(&mem_hotplug_mutex);
+}
+
+
 /* add this memory to iomem resource */
 static struct resource *register_memory_resource(u64 start, u64 size)
 {
@@ -65,9 +82,10 @@ static void release_memory_resource(struct resource *res)
 
 #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
 #ifndef CONFIG_SPARSEMEM_VMEMMAP
-static void get_page_bootmem(unsigned long info,  struct page *page, int type)
+static void get_page_bootmem(unsigned long info,  struct page *page,
+                            unsigned long type)
 {
-       atomic_set(&page->_mapcount, type);
+       page->lru.next = (struct list_head *) type;
        SetPagePrivate(page);
        set_page_private(page, info);
        atomic_inc(&page->_count);
@@ -77,15 +95,16 @@ static void get_page_bootmem(unsigned long info,  struct page *page, int type)
  * so use __ref to tell modpost not to generate a warning */
 void __ref put_page_bootmem(struct page *page)
 {
-       int type;
+       unsigned long type;
 
-       type = atomic_read(&page->_mapcount);
-       BUG_ON(type >= -1);
+       type = (unsigned long) page->lru.next;
+       BUG_ON(type < MEMORY_HOTPLUG_MIN_BOOTMEM_TYPE ||
+              type > MEMORY_HOTPLUG_MAX_BOOTMEM_TYPE);
 
        if (atomic_dec_return(&page->_count) == 1) {
                ClearPagePrivate(page);
                set_page_private(page, 0);
-               reset_page_mapcount(page);
+               INIT_LIST_HEAD(&page->lru);
                __free_pages_bootmem(page, 0);
        }
 
@@ -390,6 +409,7 @@ int online_pages(unsigned long pfn, unsigned long nr_pages)
        int ret;
        struct memory_notify arg;
 
+       lock_memory_hotplug();
        arg.start_pfn = pfn;
        arg.nr_pages = nr_pages;
        arg.status_change_nid = -1;
@@ -402,6 +422,7 @@ int online_pages(unsigned long pfn, unsigned long nr_pages)
        ret = notifier_to_errno(ret);
        if (ret) {
                memory_notify(MEM_CANCEL_ONLINE, &arg);
+               unlock_memory_hotplug();
                return ret;
        }
        /*
@@ -426,6 +447,7 @@ int online_pages(unsigned long pfn, unsigned long nr_pages)
                printk(KERN_DEBUG "online_pages %lx at %lx failed\n",
                        nr_pages, pfn);
                memory_notify(MEM_CANCEL_ONLINE, &arg);
+               unlock_memory_hotplug();
                return ret;
        }
 
@@ -450,6 +472,7 @@ int online_pages(unsigned long pfn, unsigned long nr_pages)
 
        if (onlined_pages)
                memory_notify(MEM_ONLINE, &arg);
+       unlock_memory_hotplug();
 
        return 0;
 }
@@ -493,7 +516,7 @@ int mem_online_node(int nid)
        pg_data_t       *pgdat;
        int     ret;
 
-       lock_system_sleep();
+       lock_memory_hotplug();
        pgdat = hotadd_new_pgdat(nid, 0);
        if (pgdat) {
                ret = -ENOMEM;
@@ -504,7 +527,7 @@ int mem_online_node(int nid)
        BUG_ON(ret);
 
 out:
-       unlock_system_sleep();
+       unlock_memory_hotplug();
        return ret;
 }
 
@@ -516,7 +539,7 @@ int __ref add_memory(int nid, u64 start, u64 size)
        struct resource *res;
        int ret;
 
-       lock_system_sleep();
+       lock_memory_hotplug();
 
        res = register_memory_resource(start, size);
        ret = -EEXIST;
@@ -563,7 +586,7 @@ error:
                release_memory_resource(res);
 
 out:
-       unlock_system_sleep();
+       unlock_memory_hotplug();
        return ret;
 }
 EXPORT_SYMBOL_GPL(add_memory);
@@ -716,7 +739,8 @@ do_migrate_range(unsigned long start_pfn, unsigned long end_pfn)
                        goto out;
                }
                /* this function returns # of failed pages */
-               ret = migrate_pages(&source, hotremove_migrate_alloc, 0, 1);
+               ret = migrate_pages(&source, hotremove_migrate_alloc, 0,
+                                                               true, true);
                if (ret)
                        putback_lru_pages(&source);
        }
@@ -791,7 +815,7 @@ static int offline_pages(unsigned long start_pfn,
        if (!test_pages_in_a_zone(start_pfn, end_pfn))
                return -EINVAL;
 
-       lock_system_sleep();
+       lock_memory_hotplug();
 
        zone = page_zone(pfn_to_page(start_pfn));
        node = zone_to_nid(zone);
@@ -880,7 +904,7 @@ repeat:
        writeback_set_ratelimit();
 
        memory_notify(MEM_OFFLINE, &arg);
-       unlock_system_sleep();
+       unlock_memory_hotplug();
        return 0;
 
 failed_removal:
@@ -891,7 +915,7 @@ failed_removal:
        undo_isolate_page_range(start_pfn, end_pfn);
 
 out:
-       unlock_system_sleep();
+       unlock_memory_hotplug();
        return ret;
 }