s390/numa: allocate memory with correct alignment

Allocating memory with a requested minimum alignment of 1 is wrong
since pg_data_t contains a spinlock which requires an alignment of 4
bytes.

Therefore fix this and ask for an alignment of 8 bytes like it is
guarenteed for all kmalloc requests.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Acked-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

arch/s390/numa/numa.c

@@ -57,7 +57,7 @@ static __init pg_data_t *alloc_node_data(void)
 {
 	pg_data_t *res;
 
-	res = (pg_data_t *) memblock_alloc(sizeof(pg_data_t), 1);
+	res = (pg_data_t *) memblock_alloc(sizeof(pg_data_t), 8);
 	if (!res)
 		panic("Could not allocate memory for node data!\n");
 	memset(res, 0, sizeof(pg_data_t));