sched/fair: Factor out the {at,de}taching of the per entity load {to,from} the runqueue
sched/fair: Factor out the {at,de}taching of the per entity load {to,from} the runqueue

Currently we open-code the addition/subtraction of the per entity load
to/from the runqueue, factor this out into helper functions.

Signed-off-by: Byungchul Park <e40c5f8992a9890dae9876367c0c4ab1dc1f880b@lge.com>
[ Rewrote the changelog. ]
Signed-off-by: Peter Zijlstra (Intel) <3fddac958924aef220f202ca567388ddab3f14a8@infradead.org>
Cc: Linus Torvalds <69652caca27c8b940640ad396ab71f93cacec34f@linux-foundation.org>
Cc: Mike Galbraith <3cfa3897b7f55b5396b7a47c83b66325184bc9b4@gmx.de>
Cc: Peter Zijlstra <3fddac958924aef220f202ca567388ddab3f14a8@infradead.org>
Cc: Thomas Gleixner <00e4cf8f46a57000a44449bf9dd8cbbcc209fd2a@linutronix.de>
Cc: 7bbcbf7f034930139b3e7cdc7068af37f6004f7b@intel.com
Link: http://lkml.kernel.org/r/1440069720-27038-2-git-send-email-e40c5f8992a9890dae9876367c0c4ab1dc1f880b@lge.com
Signed-off-by: Ingo Molnar <9dbbbf0688fedc85ad4da37637f1a64b8c718ee2@kernel.org>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs