sched: clean up arch_reinit_sched_domains()

- Make arch_reinit_sched_domains() static. It was exported to be used in
  s390, but now rebuild_sched_domains() is used instead.

- Make it return void.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

include/linux/sched.h

@@ -912,7 +912,6 @@ static inline struct cpumask *sched_domain_span(struct sched_domain *sd)
 
 extern void partition_sched_domains(int ndoms_new, struct cpumask *doms_new,
 				    struct sched_domain_attr *dattr_new);
-extern int arch_reinit_sched_domains(void);
 
 /* Test a flag in parent sched domain */
 static inline int test_sd_parent(struct sched_domain *sd, int flag)

kernel/sched.c

@@ -7987,7 +7987,7 @@ match2:
 }
 
 #if defined(CONFIG_SCHED_MC) || defined(CONFIG_SCHED_SMT)
-int arch_reinit_sched_domains(void)
+static void arch_reinit_sched_domains(void)
 {
 	get_online_cpus();
 
@@ -7996,13 +7996,10 @@ int arch_reinit_sched_domains(void)
 
 	rebuild_sched_domains();
 	put_online_cpus();
-
-	return 0;
 }
 
 static ssize_t sched_power_savings_store(const char *buf, size_t count, int smt)
 {
-	int ret;
 	unsigned int level = 0;
 
 	if (sscanf(buf, "%u", &level) != 1)
@@ -8023,9 +8020,9 @@ static ssize_t sched_power_savings_store(const char *buf, size_t count, int smt)
 	else
 		sched_mc_power_savings = level;
 
-	ret = arch_reinit_sched_domains();
+	arch_reinit_sched_domains();
 
-	return ret ? ret : count;
+	return count;
 }
 
 #ifdef CONFIG_SCHED_MC