diff -r b5fc88aad1b0 xen/common/sched_credit.c
--- a/xen/common/sched_credit.c	Sun Feb 18 15:29:40 2007 +0000
+++ b/xen/common/sched_credit.c	Mon Feb 19 14:05:49 2007 +0900
@@ -695,7 +695,7 @@ csched_vcpu_wake(struct vcpu *vc)
     __runq_tickle(cpu, svc);
 }
 
-static int
+static long
 csched_dom_cntl(
     struct domain *d,
     struct xen_domctl_scheduler_op *op)
diff -r b5fc88aad1b0 xen/common/sched_sedf.c
--- a/xen/common/sched_sedf.c	Sun Feb 18 15:29:40 2007 +0000
+++ b/xen/common/sched_sedf.c	Mon Feb 19 14:05:49 2007 +0900
@@ -1347,7 +1347,7 @@ static int sedf_adjust_weights(struct xe
 
 
 /* set or fetch domain scheduling parameters */
-static int sedf_adjust(struct domain *p, struct xen_domctl_scheduler_op *op)
+static long sedf_adjust(struct domain *p, struct xen_domctl_scheduler_op *op)
 {
     struct vcpu *v;
 
diff -r b5fc88aad1b0 xen/common/schedule.c
--- a/xen/common/schedule.c	Sun Feb 18 15:29:40 2007 +0000
+++ b/xen/common/schedule.c	Mon Feb 19 14:08:16 2007 +0900
@@ -497,6 +497,7 @@ long sched_adjust(struct domain *d, stru
 long sched_adjust(struct domain *d, struct xen_domctl_scheduler_op *op)
 {
     struct vcpu *v;
+    long ret;
     
     if ( (op->sched_id != ops.sched_id) ||
          ((op->cmd != XEN_DOMCTL_SCHEDOP_putinfo) &&
@@ -525,8 +526,8 @@ long sched_adjust(struct domain *d, stru
     if ( d == current->domain )
         vcpu_schedule_lock_irq(current);
 
-    SCHED_OP(adjust, d, op);
-    TRACE_1D(TRC_SCHED_ADJDOM, d->domain_id);
+    if ( (ret = SCHED_OP(adjust, d, op)) == 0 )
+        TRACE_1D(TRC_SCHED_ADJDOM, d->domain_id);
 
     if ( d == current->domain )
         vcpu_schedule_unlock_irq(current);
@@ -537,7 +538,7 @@ long sched_adjust(struct domain *d, stru
             vcpu_unpause(v);
     }
 
-    return 0;
+    return ret;
 }
 
 /* 
diff -r b5fc88aad1b0 xen/include/xen/sched-if.h
--- a/xen/include/xen/sched-if.h	Sun Feb 18 15:29:40 2007 +0000
+++ b/xen/include/xen/sched-if.h	Mon Feb 19 14:05:49 2007 +0900
@@ -75,7 +75,7 @@ struct scheduler {
     struct task_slice (*do_schedule) (s_time_t);
 
     int          (*pick_cpu)       (struct vcpu *);
-    int          (*adjust)         (struct domain *,
+    long         (*adjust)         (struct domain *,
                                     struct xen_domctl_scheduler_op *);
     void         (*dump_settings)  (void);
     void         (*dump_cpu_state) (int);