Jesper Dangaard Brouer <brouer@xxxxxxxxxx> writes:
> On Thu, 23 Jan 2020 17:34:38 +0530
> Amol Grover <frextrite@xxxxxxxxx> wrote:
>
>> head is traversed using hlist_for_each_entry_rcu outside an
>> RCU read-side critical section but under the protection
>> of dtab->index_lock.
>
> We do hold the lock in update and delete cases, but not in the lookup
> cases. Is it then still okay to add the lockdep_is_held() annotation?
I concluded 'yes' from the comment on hlist_for_each_entry_rcu():
The lockdep condition gets passed to this:
#define __list_check_rcu(dummy, cond, extra...) \
({ \
check_arg_count_one(extra); \
RCU_LOCKDEP_WARN(!cond && !rcu_read_lock_any_held(), \
"RCU-list traversed in non-reader section!"); \
})
so that seems fine :)
-Toke
