Re: [PATCH v2 1/4] introduce for_each_thread() to replace the buggywhile_each_thread()

[David Rientjes]

On Thu, 5 Dec 2013, Oleg Nesterov wrote:

> > Minor: should the definitions of thread_{head,node} be annotated with
> > __rcu for users of CONFIG_SPARSE_RCU_POINTER?
> 
> Perhaps. And perhaps task_struct->tasks. And perhaps we should add
> rcu_read_lock_held() || lockdep_is_held(tasklist) || lockdep_is_held(siglock)
> into for_each_process/thead.
> 
> But lets do this later. At least we should avoid the false positives.
> 

Ok, thanks.  I think anything we can do to catch these cases of 
unprotected usage even with some debugging options like 
CONFIG_SPARSE_RCU_POINTER and CONFIG_LOCKDEP will help given the number of 
places you found that were doing it incorrectly already.
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