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workqueue: RCU protect wq->dfl_pwq and implement accessors for it
[ Upstream commit 9f66cff212bb3c1cd25996aaa0dfd0c9e9d8baab ] 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> Stable-dep-of: 5797b1c18919 ("workqueue: Implement system-wide nr_active enforcement for unbound workqueues") Signed-off-by: Sasha Levin <sashal@kernel.org>
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