Re: [PATCH RFC tip/core/rcu 0/4] Forbid static SRCU use in modules

[Mathieu Desnoyers]

----- On Apr 9, 2019, at 1:55 PM, paulmck paulmck@xxxxxxxxxxxxx wrote:
[...]
> The current state is not horrible, so my thought would be to give it
> some time to see if better thoughts arise.
> 
> Either way, cleanup_srcu_struct() keeps its current checks for callbacks
> still being in flight, which is why I believe that the current state is
> not horrible.  ;-)

In that case, I think the comment above cleanup_srcu_struct_quiesced() in
include/linux/srcu.h needs to be updated to cover situations where API
users statically define a SRCU domain in a module and intend to unload
that module.

Given that we end up doing the allocation/cleanup under the hood, the
API users don't interact with init_srcu_struct() nor cleanup_srcu_struct(),
so it's not obvious that this comment also applies to them.

Thanks,

Mathieu

-- 
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com