X-Git-Url: http://pilppa.org/gitweb/gitweb.cgi?a=blobdiff_plain;f=mm%2Fmemory_hotplug.c;h=7469c503580dcf6402000cc339359175a9b417fc;hb=6794c7526651160a75e90322cb750dcceb310d34;hp=091b9c6c252973dd1cf5e89ffcf73de1afba173c;hpb=92d15c2ccbb3e31a3fc71ad28fdb55e1319383c0;p=linux-2.6-omap-h63xx.git

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 091b9c6c252..7469c503580 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -39,7 +39,7 @@ static struct resource *register_memory_resource(u64 start, u64 size)
 	res->name = "System RAM";
 	res->start = start;
 	res->end = start + size - 1;
-	res->flags = IORESOURCE_MEM;
+	res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
 	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);
@@ -121,7 +121,7 @@ int __add_pages(struct zone *zone, unsigned long phys_start_pfn,
 		err = __add_section(zone, i << PFN_SECTION_SHIFT);
 
 		/*
-		 * EEXIST is finally dealed with by ioresource collision
+		 * EEXIST is finally dealt with by ioresource collision
 		 * check. see add_memory() => register_memory_resource()
 		 * Warning will be printed if there is collision.
 		 */
@@ -187,7 +187,24 @@ int online_pages(unsigned long pfn, unsigned long nr_pages)
 	unsigned long onlined_pages = 0;
 	struct zone *zone;
 	int need_zonelists_rebuild = 0;
+	int nid;
+	int ret;
+	struct memory_notify arg;
+
+	arg.start_pfn = pfn;
+	arg.nr_pages = nr_pages;
+	arg.status_change_nid = -1;
+
+	nid = page_to_nid(pfn_to_page(pfn));
+	if (node_present_pages(nid) == 0)
+		arg.status_change_nid = nid;
 
+	ret = memory_notify(MEM_GOING_ONLINE, &arg);
+	ret = notifier_to_errno(ret);
+	if (ret) {
+		memory_notify(MEM_CANCEL_ONLINE, &arg);
+		return ret;
+	}
 	/*
 	 * This doesn't need a lock to do pfn_to_page().
 	 * The section can't be removed here because of the
@@ -222,6 +239,10 @@ int online_pages(unsigned long pfn, unsigned long nr_pages)
 		build_all_zonelists();
 	vm_total_pages = nr_free_pagecache_pages();
 	writeback_set_ratelimit();
+
+	if (onlined_pages)
+		memory_notify(MEM_ONLINE, &arg);
+
 	return 0;
 }
 #endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */
@@ -460,15 +481,14 @@ check_pages_isolated(unsigned long start_pfn, unsigned long end_pfn)
 	return offlined;
 }
 
-extern void drain_all_local_pages(void);
-
 int offline_pages(unsigned long start_pfn,
 		  unsigned long end_pfn, unsigned long timeout)
 {
 	unsigned long pfn, nr_pages, expire;
 	long offlined_pages;
-	int ret, drain, retry_max;
+	int ret, drain, retry_max, node;
 	struct zone *zone;
+	struct memory_notify arg;
 
 	BUG_ON(start_pfn >= end_pfn);
 	/* at least, alignment against pageblock is necessary */
@@ -480,11 +500,27 @@ int offline_pages(unsigned long start_pfn,
 	   we assume this for now. .*/
 	if (!test_pages_in_a_zone(start_pfn, end_pfn))
 		return -EINVAL;
+
+	zone = page_zone(pfn_to_page(start_pfn));
+	node = zone_to_nid(zone);
+	nr_pages = end_pfn - start_pfn;
+
 	/* set above range as isolated */
 	ret = start_isolate_page_range(start_pfn, end_pfn);
 	if (ret)
 		return ret;
-	nr_pages = end_pfn - start_pfn;
+
+	arg.start_pfn = start_pfn;
+	arg.nr_pages = nr_pages;
+	arg.status_change_nid = -1;
+	if (nr_pages >= node_present_pages(node))
+		arg.status_change_nid = node;
+
+	ret = memory_notify(MEM_GOING_OFFLINE, &arg);
+	ret = notifier_to_errno(ret);
+	if (ret)
+		goto failed_removal;
+
 	pfn = start_pfn;
 	expire = jiffies + timeout;
 	drain = 0;
@@ -502,7 +538,7 @@ repeat:
 		lru_add_drain_all();
 		flush_scheduled_work();
 		cond_resched();
-		drain_all_local_pages();
+		drain_all_pages();
 	}
 
 	pfn = scan_lru_pages(start_pfn, end_pfn);
@@ -525,7 +561,7 @@ repeat:
 	flush_scheduled_work();
 	yield();
 	/* drain pcp pages , this is synchrouns. */
-	drain_all_local_pages();
+	drain_all_pages();
 	/* check again */
 	offlined_pages = check_pages_isolated(start_pfn, end_pfn);
 	if (offlined_pages < 0) {
@@ -536,23 +572,27 @@ repeat:
 	/* Ok, all of our target is islaoted.
 	   We cannot do rollback at this point. */
 	offline_isolated_pages(start_pfn, end_pfn);
-	/* reset pagetype flags */
-	start_isolate_page_range(start_pfn, end_pfn);
+	/* reset pagetype flags and makes migrate type to be MOVABLE */
+	undo_isolate_page_range(start_pfn, end_pfn);
 	/* removal success */
-	zone = page_zone(pfn_to_page(start_pfn));
 	zone->present_pages -= offlined_pages;
 	zone->zone_pgdat->node_present_pages -= offlined_pages;
 	totalram_pages -= offlined_pages;
 	num_physpages -= offlined_pages;
+
 	vm_total_pages = nr_free_pagecache_pages();
 	writeback_set_ratelimit();
+
+	memory_notify(MEM_OFFLINE, &arg);
 	return 0;
 
 failed_removal:
 	printk(KERN_INFO "memory offlining %lx to %lx failed\n",
 		start_pfn, end_pfn);
+	memory_notify(MEM_CANCEL_OFFLINE, &arg);
 	/* pushback to free area */
 	undo_isolate_page_range(start_pfn, end_pfn);
+
 	return ret;
 }
 #else