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Change the on-cpu check to on-runqueue to catch if the waiter has been woken (and reset its current_state back to TASK_UNINTERRUPTIBLE to perform the seqno check) but is sleeping due to being preempted off the cpu. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20181203113701.12106-1-chris@chris-wilson.co.uk