Re: [RFC] Make need_resched() return true when rcu_urgent_qs requested

[Peter Zijlstra]

On Mon, Jul 09, 2018 at 07:29:32AM -0700, Paul E. McKenney wrote:

> OK, so here are our options:
> 
> 1.	Add the RCU conditional to need_resched(), as David suggests.
> 	Peter has concerns about overhead.

Not only overhead, its plain broken, because:

 1) we keep preemption state in other places too
 2) we check need_resched() in asm