unregistration, and execution:
- Add some brackets for clarity and trim a bit of vertical whitespace.
- Remove comments that may not contribute to clarity, such as "Lock"
before acquiring a lock and "Get memory" before allocating memory.
- During hook registration, don't drop pfil_list_lock between checking
for a duplicate and registering the hook, as this leaves a race
condition by failing to enforce the "no duplicate hooks" invariant.
- Don't lock the hook during registration, since it's not yet in use.
- Document assumption that hooks will be quiesced before being
unregistered.
- Don't write-lock hooks during removal because they are assumed
quiesced.
- Rename "done" label to "locked_error" to be clear that it's an error
path on the way out of hook execution.
MFC after: pretty soon
d2c205d5de