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| author | Lai Jiangshan <laijs@cn.fujitsu.com> | 2012-09-18 09:59:22 -0700 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2012-09-18 09:59:22 -0700 |
| commit | eab6d82843ee1df244f8847d1bf8bb89160ec4aa (patch) | |
| tree | 86a43e6ae1734779fe54ea5e62408395e6d0b36a /mm | |
| parent | ea1abd6197d5805655da1bb589929762f4b4aa08 (diff) | |
| download | op-kernel-dev-eab6d82843ee1df244f8847d1bf8bb89160ec4aa.zip op-kernel-dev-eab6d82843ee1df244f8847d1bf8bb89160ec4aa.tar.gz | |
workqueue: WORKER_REBIND is no longer necessary for busy rebinding
Because the old unbind/rebinding implementation wasn't atomic w.r.t.
GCWQ_DISASSOCIATED manipulation which is protected by
global_cwq->lock, we had to use two flags, WORKER_UNBOUND and
WORKER_REBIND, to avoid incorrectly losing all NOT_RUNNING bits with
back-to-back CPU hotplug operations; otherwise, completion of
rebinding while another unbinding is in progress could clear UNBIND
prematurely.
Now that both unbind/rebinding are atomic w.r.t. GCWQ_DISASSOCIATED,
there's no need to use two flags. Just one is enough. Don't use
WORKER_REBIND for busy rebinding.
tj: Updated description.
Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'mm')
0 files changed, 0 insertions, 0 deletions
