On Sunday, 16 February 2020 16:33:24 CET Madhuparna Bhowmik wrote: [...]
Can you tell us how you've identified these four hlist_for_each_entry_rcu?
The other hlist_for_each_entry_rcu() are used under the protection of rcu_read_lock(). We only need to pass the cond when hlist_for_each_entry_rcu() is used under a different lock (not under rcu_red_lock()) because according to the current scheme a lockdep splat is generated when hlist_for_each_entry_rcu() is used outside of rcu_read_lock() or the lockdep condition (the cond argument) evaluates to false. So, we need to pass this cond when it is used under the protection of spinlock or mutex etc. and not required if rcu_read_lock() is used.
I understand this part. I was asking how you've identified them. Did you use any tool for that? coccinelle, sparse, ...
Kind regards, Sven