alinux: sched: Fix nr_migrations compile errors

to #27363370

When CONFIG_SCHED_SLI is not set, compiler gives errors about
task_ca_increase_nr_migrations redefinition. It should've been
an empty implementation in this case.

Fixes: 965d75d3 ("alinux: cpuacct: make cpuacct record nr_migrations")
Signed-off-by: NYihao Wu <wuyihao@linux.alibaba.com>
Acked-by: NCaspar Zhang <caspar@linux.alibaba.com>

kernel/sched/cpuacct.c

@@ -77,6 +77,7 @@ static struct cpuacct root_cpuacct = {
 #endif
 };
 
+#ifdef CONFIG_SCHED_SLI
 void task_ca_increase_nr_migrations(struct task_struct *tsk)
 {
 	struct cpuacct *ca;
@@ -86,6 +87,7 @@ void task_ca_increase_nr_migrations(struct task_struct *tsk)
 	this_cpu_ptr(ca->alistats)->nr_migrations++;
 	rcu_read_unlock();
 }
+#endif
 
 /* Create a new CPU accounting group */
 static struct cgroup_subsys_state *

kernel/sched/sched.h

@@ -2287,7 +2287,7 @@ unsigned long scale_irq_capacity(unsigned long util, unsigned long irq, unsigned
 #ifdef CONFIG_SCHED_SLI
 extern u64 get_idle_time(int cpu);
 extern u64 get_iowait_time(int cpu);
-void task_ca_increase_nr_migrations(struct task_struct *tsk);
+extern void task_ca_increase_nr_migrations(struct task_struct *tsk);
 #else
 static inline void task_ca_increase_nr_migrations(struct task_struct *tsk) { }
 #endif