Alexey Dobriyan wrote:
quoted text
> call_rcu() will unconditionally rewrite RCU head anyway.
> Applies to 
> 	struct neigh_parms
> 	struct neigh_table
> 	struct net
> 	struct cipso_v4_doi
> 	struct in_ifaddr
> 	struct in_device
> 	rt->u.dst

It would probably make sense to get a statement from Paul
whether this might be required in the future, f.i. for some
debugging feature.
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