On 23/10/20 09:19, Peter Zijlstra wrote: >> + /* >> + * preemption needs to be kept disabled between prepare_to_busy_poll() >> + * and end_busy_poll(). >> + */ >> + BUG_ON(preemptible()); >> + if (allow_resched) >> + preempt_enable(); >> + else >> + preempt_enable_no_resched(); > NAK on @allow_resched > Since KVM is the one passing false, indeed I see no reason for the argument; you can just use preempt_enable(). There is no impact for example on the tracking of how much time was spent polling; that ktime_get() for the end of the polling period is done before calling end_busy_poll(). Paolo
