Tejun Heo 9f66cff212
workqueue: RCU protect wq->dfl_pwq and implement accessors for it ...
wq->cpu_pwq is RCU protected but wq->dfl_pwq isn't. This is okay because
currently wq->dfl_pwq is used only accessed to install it into wq->cpu_pwq
which doesn't require RCU access. However, we want to be able to access
wq->dfl_pwq under RCU in the future to access its __pod_cpumask and the code
can be made easier to read by making the two pwq fields behave in the same
way.
- Make wq->dfl_pwq RCU protected.
- Add unbound_pwq_slot() and unbound_pwq() which can access both ->dfl_pwq
and ->cpu_pwq. The former returns the double pointer that can be used
access and update the pwqs. The latter performs locking check and
dereferences the double pointer.
- pwq accesses and updates are converted to use unbound_pwq[_slot]().
Signed-off-by: Tejun Heo <tj@kernel.org >
Reviewed-by: Lai Jiangshan <jiangshanlai@gmail.com >
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