[PATCH v2] xen: sched: removal of redundant check in Credit

[Praveen Kumar <kpraveen.lkml@gmail.com>]

The patch gets rid of a redundant check in csched_vcpu_acct. In fact,
the function is only called from csched_tick, which already checks
that current is not the idle vcpu. The patch also adds an ASSERT to
the same effect, in order to make assumption ( i.e., no calling this
on idle vcpus) even more clear and as a guard for future mis-use.

Signed-off-by: Praveen Kumar <kpraveen.lkml@gmail.com>

---
Changed since v1:
   * Changelog updated as per the comment.

v2:

diff --git a/xen/common/sched_credit.c b/xen/common/sched_credit.c
index fc3a321..dfe8545 100644
--- a/xen/common/sched_credit.c
+++ b/xen/common/sched_credit.c
@@ -941,6 +941,7 @@ csched_vcpu_acct(struct csched_private *prv,
unsigned int cpu)

     ASSERT( current->processor == cpu );
     ASSERT( svc->sdom != NULL );
+    ASSERT( !is_idle_vcpu(svc->vcpu) );

     /*
      * If this VCPU's priority was boosted when it last awoke, reset
it.
@@ -957,8 +958,7 @@ csched_vcpu_acct(struct csched_private *prv,
unsigned int cpu)
     /*
      * Update credits
      */
-    if ( !is_idle_vcpu(svc->vcpu) )
-        burn_credits(svc, NOW());
+    burn_credits(svc, NOW());

     /*
      * Put this VCPU and domain back on the active list if it was

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