call_rcu threads should clear their PAUSED flag when they unpause
And call_rcu_after_fork_parent should spin-wait on this.
Otherwise a second fork in the parent will see the PAUSED flags
already set and call_rcu_before_fork will not correctly wait for the
call_rcu threads to quiesce on this second occasion.
Fixes #786
Signed-off-by: Keir Fraser <keir@cohodata.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
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