Commit f78195129963 ("kvm: add halt_poll_ns module parameter") calls, with
enabled preemption, single_task_running. When CONFIG_DEBUG_PREEMPT is
enabled that will result in a debug_smp_processor_id() call.Cc: <[email protected]> # 4.2.x Signed-off-by: Dominik Dingel <[email protected]> --- virt/kvm/kvm_main.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 54534de..ce67dd6 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -1971,6 +1971,7 @@ void kvm_vcpu_block(struct kvm_vcpu *vcpu) start = cur = ktime_get(); if (vcpu->halt_poll_ns) { + bool solo; ktime_t stop = ktime_add_ns(ktime_get(), vcpu->halt_poll_ns); do { @@ -1982,8 +1983,13 @@ void kvm_vcpu_block(struct kvm_vcpu *vcpu) ++vcpu->stat.halt_successful_poll; goto out; } + + preempt_disable(); + solo = single_task_running(); + preempt_enable(); + cur = ktime_get(); - } while (single_task_running() && ktime_before(cur, stop)); + } while (solo && ktime_before(cur, stop)); } for (;;) { -- 2.3.8 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
