Messages in this thread | | | Date | Tue, 21 Apr 2020 15:52:58 +0200 | From | Peter Zijlstra <> | Subject | Re: [PATCH] sched/fair: Fix call walk_tg_tree_from() without hold rcu_lock |
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On Mon, Apr 06, 2020 at 08:10:08PM +0800, Muchun Song wrote: > The walk_tg_tree_from() caller must hold rcu_lock,
Not quite; with the RCU unification done 'recently' having preemption disabled is sufficient. AFAICT preemption is disabled.
In fact; and I mentioned this to someone the other day, perhaps Joel; we can go and delete a whole bunch of rcu_read_lock() from the scheduler -- basically undo all the work we did after RCU was split many years ago.
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