sched: Remove reciprocal for cpu_power

Its a source of fail, also, now that cpu_power is dynamical,
its a waste of time.

before:
<idle>-0   [000]   132.877936: find_busiest_group: avg_load: 0 group_load: 8241 power: 1

after:
bash-1689  [001]   137.862151: find_busiest_group: avg_load: 10636288 group_load: 10387 power: 1

[ v2: build fix from From: Andreas Herrmann ]

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Tested-by: Andreas Herrmann <andreas.herrmann3@amd.com>
Acked-by: Andreas Herrmann <andreas.herrmann3@amd.com>
Acked-by: Gautham R Shenoy <ego@in.ibm.com>
Cc: Balbir Singh <balbir@in.ibm.com>
LKML-Reference: <20090901083826.425896304@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 2 insertions, 8 deletions

diff --git a/include/linux/sched.h b/include/linux/sched.h
index c67ddf309c84..3b7f43e3b736 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -860,15 +860,9 @@ struct sched_group {
 
         /*
          * CPU power of this group, SCHED_LOAD_SCALE being max power for a
-         * single CPU. This is read only (except for setup, hotplug CPU).
-         * Note : Never change cpu_power without recompute its reciprocal
+         * single CPU.
          */
-        unsigned int __cpu_power;
-        /*
-         * reciprocal value of cpu_power to avoid expensive divides
-         * (see include/linux/reciprocal_div.h)
-         */
-        u32 reciprocal_cpu_power;
+        unsigned int cpu_power;
 
         /*
          * The CPUs this group covers.