[Xen-devel] [PATCH] Cosmetic change to schedule_cpu_switch

[George Dunlap <george.dunlap@xxxxxxxxxxxxx>]

Using 'v' generally means that you mean any generic vcpu, not
a particular vcpu.  In this case, we always use the idle vcpu;
I think naming it explicitly idle_vcpu makes the code easier to grok.

No functional changes.

Signed-off-by: George Dunlap <george.dunlap@xxxxxxxxxxxxx>

diff -r c6db509d7e46 -r ebad6ba33a8f xen/common/schedule.c
--- a/xen/common/schedule.c     Tue May 18 15:18:26 2010 +0100
+++ b/xen/common/schedule.c     Tue May 18 15:22:27 2010 -0500
@@ -1151,7 +1151,7 @@
 void schedule_cpu_switch(unsigned int cpu, struct cpupool *c)
 {
     unsigned long flags;
-    struct vcpu *v;
+    struct vcpu *idle_vcpu;
     void *ppriv, *ppriv_old, *vpriv = NULL;
     struct scheduler *old_ops = per_cpu(scheduler, cpu);
     struct scheduler *new_ops = (c == NULL) ? &ops : c->sched;
@@ -1159,21 +1159,21 @@
     if ( old_ops == new_ops )
         return;
 
-    v = per_cpu(schedule_data, cpu).idle;
+    idle_vcpu = per_cpu(schedule_data, cpu).idle;
     ppriv = SCHED_OP(new_ops, alloc_pdata, cpu);
     if ( c != NULL )
-        vpriv = SCHED_OP(new_ops, alloc_vdata, v, v->domain->sched_priv);
+        vpriv = SCHED_OP(new_ops, alloc_vdata, idle_vcpu, 
idle_vcpu->domain->sched_priv);
 
     spin_lock_irqsave(per_cpu(schedule_data, cpu).schedule_lock, flags);
 
     if ( c == NULL )
     {
-        vpriv = v->sched_priv;
-        v->sched_priv = per_cpu(schedule_data, cpu).sched_idlevpriv;
+        vpriv = idle_vcpu->sched_priv;
+        idle_vcpu->sched_priv = per_cpu(schedule_data, cpu).sched_idlevpriv;
     }
     else
     {
-        v->sched_priv = vpriv;
+        idle_vcpu->sched_priv = vpriv;
         vpriv = NULL;
     }
     SCHED_OP(old_ops, tick_suspend, cpu);
@@ -1181,7 +1181,7 @@
     ppriv_old = per_cpu(schedule_data, cpu).sched_priv;
     per_cpu(schedule_data, cpu).sched_priv = ppriv;
     SCHED_OP(new_ops, tick_resume, cpu);
-    SCHED_OP(new_ops, insert_vcpu, v);
+    SCHED_OP(new_ops, insert_vcpu, idle_vcpu);
 
     spin_unlock_irqrestore(per_cpu(schedule_data, cpu).schedule_lock, flags);
 

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