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-rw-r--r--mm/page_alloc.c16
1 files changed, 16 insertions, 0 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index afee38f04d8..ebd425c2e2a 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -3120,3 +3120,19 @@ unsigned long page_to_pfn(struct page *page)
EXPORT_SYMBOL(pfn_to_page);
EXPORT_SYMBOL(page_to_pfn);
#endif /* CONFIG_OUT_OF_LINE_PFN_TO_PAGE */
+
+#if MAX_NUMNODES > 1
+/*
+ * Find the highest possible node id.
+ */
+int highest_possible_node_id(void)
+{
+ unsigned int node;
+ unsigned int highest = 0;
+
+ for_each_node_mask(node, node_possible_map)
+ highest = node;
+ return highest;
+}
+EXPORT_SYMBOL(highest_possible_node_id);
+#endif