Re: getting processor numbers

[Ingo Molnar]

* Oleg Nesterov <oleg@xxxxxxxxxx> wrote:

> But we don't need tasklist_lock at all, we can use 
> rcu_read_lock/unlock. Q: don't we need task_rq_lock() to read 
> ->cpus_allowed "atomically" ?

right now ->cpus_allowed is protected by tasklist_lock. We cannot do RCU 
here because ->cpus_allowed modifications are not RCUified.

	Ingo
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