s390: make couple of functions and variables static

As reported by sparse these can and should be static.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

arch/s390/kernel/topology.c

@@ -421,7 +421,7 @@ int topology_cpu_init(struct cpu *cpu)
 	return sysfs_create_group(&cpu->dev.kobj, &topology_cpu_attr_group);
 }
 
-const struct cpumask *cpu_thread_mask(int cpu)
+static const struct cpumask *cpu_thread_mask(int cpu)
 {
 	return &per_cpu(cpu_topology, cpu).thread_mask;
 }

arch/s390/mm/mmap.c

@@ -32,7 +32,7 @@
 #include <asm/pgalloc.h>
 
 unsigned long mmap_rnd_mask;
-unsigned long mmap_align_mask;
+static unsigned long mmap_align_mask;
 
 static unsigned long stack_maxrandom_size(void)
 {