xen: export do_yield as vcpu_yield

Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Acked-by: George Dunlap <george.dunlap@eu.citrix.com>
CC: JBeulich@suse.com

xen/common/schedule.c

@@ -795,7 +795,7 @@ static long do_poll(struct sched_poll *sched_poll)
 }
 
 /* Voluntarily yield the processor for this allocation. */
-static long do_yield(void)
+long vcpu_yield(void)
 {
     struct vcpu * v=current;
     spinlock_t *lock = vcpu_schedule_lock_irq(v);
@@ -888,7 +888,7 @@ long do_sched_op_compat(int cmd, unsigned long arg)
     {
     case SCHEDOP_yield:
     {
-        ret = do_yield();
+        ret = vcpu_yield();
         break;
     }
 
@@ -925,7 +925,7 @@ ret_t do_sched_op(int cmd, XEN_GUEST_HANDLE_PARAM(void) arg)
     {
     case SCHEDOP_yield:
     {
-        ret = do_yield();
+        ret = vcpu_yield();
         break;
     }
 

xen/include/xen/sched.h

@@ -639,6 +639,7 @@ int  sched_id(void);
 void sched_tick_suspend(void);
 void sched_tick_resume(void);
 void vcpu_wake(struct vcpu *v);
+long vcpu_yield(void);
 void vcpu_sleep_nosync(struct vcpu *v);
 void vcpu_sleep_sync(struct vcpu *v);