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workqueue: Improve locking rule description for worker fields

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* Some worker fields are modified only by the worker itself while holding
  pool->lock thus making them safe to read from self, IRQ context if the CPU
  is running the worker or while holding pool->lock. Add 'K' locking rule
  for them.

* worker->sleeping is currently marked "None" which isn't very descriptive.
  It's used only by the worker itself. Add 'S' locking rule for it.

A future patch will depend on the 'K' rule to access worker->current_* from
the scheduler ticks.

Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Tejun Heo
2023-05-17 17:02:08 -10:00
parent c54d5046a0
commit bdf8b9bfc1
2 changed files with 14 additions and 7 deletions
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6
kernel/workqueue.c
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@@ -126,6 +126,12 @@ enum {
* cpu or grabbing pool->lock is enough for read access. If
* POOL_DISASSOCIATED is set, it's identical to L.
*
* K: Only modified by worker while holding pool->lock. Can be safely read by
* self, while holding pool->lock or from IRQ context if %current is the
* kworker.
*
* S: Only modified by worker self.
*
* A: wq_pool_attach_mutex protected.
*
* PL: wq_pool_mutex protected.