Re: [patch 0/6] rcu head debugobjects

[Mathieu Desnoyers]

Hi Paul,

Thinking about the rcu head init topic, we might be able to drop the
init_rcu_head() initializer. The idea is the following:

- We need init_rcu_head_on_stack()/destroy_rcu_head_on_stack().
- call_rcu() populates the rcu_head and normally does not care about it being
  pre-initialized.
- The activation fixup can detect if a non-initialized rcu head is being
  activated and just perform the fixup without complaining.
- If we have two call_rcu() in a row in the same GP on the same rcu_head, the
  activation check will detect it.

So either we remove all the init_rcu_head(), as was originally proposed, or we
use one that is a no-op on !DEBUG configs and initialize the object with DEBUG
configs.

That removes the dependency on object_is_static().

Thoughts ?

Thanks,

Mathieu


-- 
Mathieu Desnoyers
Operating System Efficiency R&D Consultant
EfficiOS Inc.
http://www.efficios.com
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