Merge branch 'linus' into x86/urgent

Required to queue a dependent fix.

1 files changed, 23 insertions, 0 deletions

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 25982467800b..7deb49f69e27 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1237,6 +1237,29 @@ static struct page *next_active_pageblock(struct page *page)
 	return page + pageblock_nr_pages;
 }
 
+static bool is_pageblock_removable_nolock(struct page *page)
+{
+	struct zone *zone;
+	unsigned long pfn;
+
+	/*
+	 * We have to be careful here because we are iterating over memory
+	 * sections which are not zone aware so we might end up outside of
+	 * the zone but still within the section.
+	 * We have to take care about the node as well. If the node is offline
+	 * its NODE_DATA will be NULL - see page_zone.
+	 */
+	if (!node_online(page_to_nid(page)))
+		return false;
+
+	zone = page_zone(page);
+	pfn = page_to_pfn(page);
+	if (!zone_spans_pfn(zone, pfn))
+		return false;
+
+	return !has_unmovable_pages(zone, page, 0, MIGRATE_MOVABLE, true);
+}
+
 /* Checks if this range of memory is likely to be hot-removable. */
 bool is_mem_section_removable(unsigned long start_pfn, unsigned long nr_pages)
 {