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-rw-r--r--arch/ia64/mm/discontig.c16
1 files changed, 13 insertions, 3 deletions
diff --git a/arch/ia64/mm/discontig.c b/arch/ia64/mm/discontig.c
index 525b082eb661..99bd9e30db96 100644
--- a/arch/ia64/mm/discontig.c
+++ b/arch/ia64/mm/discontig.c
@@ -313,9 +313,19 @@ static void __meminit scatter_node_data(void)
pg_data_t **dst;
int node;
- for_each_online_node(node) {
- dst = LOCAL_DATA_ADDR(pgdat_list[node])->pg_data_ptrs;
- memcpy(dst, pgdat_list, sizeof(pgdat_list));
+ /*
+ * for_each_online_node() can't be used at here.
+ * node_online_map is not set for hot-added nodes at this time,
+ * because we are halfway through initialization of the new node's
+ * structures. If for_each_online_node() is used, a new node's
+ * pg_data_ptrs will be not initialized. Insted of using it,
+ * pgdat_list[] is checked.
+ */
+ for_each_node(node) {
+ if (pgdat_list[node]) {
+ dst = LOCAL_DATA_ADDR(pgdat_list[node])->pg_data_ptrs;
+ memcpy(dst, pgdat_list, sizeof(pgdat_list));
+ }
}
}