workqueue: make GCWQ_FREEZING a pool flag
authorTejun Heo <tj@kernel.org>
Thu, 24 Jan 2013 19:01:33 +0000 (11:01 -0800)
committerTejun Heo <tj@kernel.org>
Thu, 24 Jan 2013 19:01:33 +0000 (11:01 -0800)
commit35b6bb63b8a288f90e07948867941a553b3d97bc
tree275528f970a80c9bf403a66450808a006db65ba8
parent2464757086b4de0591738d5e30f069d068d70ec0
workqueue: make GCWQ_FREEZING a pool flag

Make GCWQ_FREEZING a pool flag POOL_FREEZING.  This patch doesn't
change locking - FREEZING on both pools of a CPU are set or clear
together while holding gcwq->lock.  It shouldn't cause any functional
difference.

This leaves gcwq->flags w/o any flags.  Removed.

While at it, convert BUG_ON()s in freeze_workqueue_begin() and
thaw_workqueues() to WARN_ON_ONCE().

This is part of an effort to remove global_cwq and make worker_pool
the top level abstraction, which in turn will help implementing worker
pools with user-specified attributes.

Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Lai Jiangshan <laijs@cn.fujitsu.com>
kernel/workqueue.c