On Thu, Oct 19, 2017 at 11:24:00PM +0000, Bart Van Assche wrote: > Are there any completion objects for which the cross-release checking is > useful? Are there any wait_for_completion() callers that hold a mutex or > other locking object? Check /proc/lockdep, then you can find all dependencies wrt cross-lock. I named a lock class of wait_for_completion(), a sting starting with "(complete)". For example, in my machine: console_lock -> (complete)&req.done cpu_hotplug_lock.rw_sem -> (complete)&st->done_up cpuhp_state_mutex -> (complete)&st->done_up and so on.
