Zhang, Xiantao wrote:
Hi, Carsten Why do you think it is racy? In this function,For example to lock against destroying that vcpu. Or, the waitqueue may become active after if (waitqueue_active()) and before wake_up_interruptible(). In that case, the target vcpu might sleep and not get waken up by the ipi.target_vcpu->arch.launched should be set to 1 for the first run, and keep its value all the time. Except the first IPI to wake up the vcpu, all IPIs received by target vcpu should go into "else" condition. So you mean the race condition exist in "else" code ?
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