Subject: clean up chaining in sched_yield()
From: Sven-Thorsten Dietrich <redacted>

The call to sys_sched_yield for in-Kernel is messy.
and the return code from sys_sched_yield is ignored when called from
in-kernel.

Signed-off-by: Sven-Thorsten Dietrich <redacted>

diff --git a/kernel/sched.c b/kernel/sched.c
index 3c11ae0..db2c0f9 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c

@@ -6647,12 +6647,12 @@ SYSCALL_DEFINE3(sched_getaffinity, pid_t, pid, unsigned int, len,
 }
 
 /**
- * sys_sched_yield - yield the current processor to other threads.
+ * do_sched_yield - yield the current processor to other threads.
  *
  * This function yields the current CPU to other tasks. If there are no
  * other threads running on this CPU then this function will return.
  */
-SYSCALL_DEFINE0(sched_yield)
+static inline void do_sched_yield(void) 
 {
 	struct rq *rq = this_rq_lock();
 

@@ -6669,6 +6669,11 @@ SYSCALL_DEFINE0(sched_yield)
 	preempt_enable_no_resched();
 
 	schedule();
+}
+
+SYSCALL_DEFINE0(sched_yield)
+{
+	do_sched_yield();
 
 	return 0;
 }

@@ -6746,7 +6751,7 @@ EXPORT_SYMBOL(__cond_resched_softirq);
 void __sched yield(void)
 {
 	set_current_state(TASK_RUNNING);
-	sys_sched_yield();
+	do_sched_yield();
 }
 EXPORT_SYMBOL(yield);