Amol Grover [off-list ref] writes:

head is traversed using hlist_for_each_entry_rcu outside an
RCU read-side critical section but under the protection
of dtab->index_lock.

Hence, add corresponding lockdep expression to silence false-positive
lockdep warnings, and harden RCU lists.

Signed-off-by: Amol Grover <redacted>

Could you please add an appropriate Fixes: tag?

Otherwise:
Acked-by: Toke Høiland-Jørgensen <redacted>