workqueue: reimplement unbind/rebind

Patch 2 a different way to fix deadlock problem. it removes 50 LOC !!
Patch 3-4 cleanup rebind

Patch 5-9 prepare for patch 10
Patch 10  unbind/rebind without manager_mutex, fix bug hotplug VS manage

	The first core algorithm for 5-10 is detecting the changes of binding
	by GCWQ_DISASSOCIATED bit and WORKER_UNBOUND bit.
	The second core algorithm is exile-operation. Patch2,9


Patch 11  cleanup manager.


Patch 1 accepted, just resent.

Changed from V4:
Give up to make manage_mutex safer, remove it instead.

Lai Jiangshan (11):
  workqueue: ensure the wq_worker_sleeping() see the      right flags
  async idle rebinding
  new day don't need WORKER_REBIND for busy worker
  remove WORKER_REBIND
  Add @bind arguement back
  unbind manager
  rebind manager
  unbind newly created worker
  rebind newly created worker
  unbind/rebind without manager_mutex
  remove manager_mutex

 kernel/workqueue.c |  270 ++++++++++++++++++++++++----------------------------
 1 files changed, 124 insertions(+), 146 deletions(-)

-- 
1.7.4.4

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