Hi Ming On 09/11/2018 04:20 PM, Ming Lei wrote: > We only check the 'whole counting' at atomic mode, so it is the atomic > part('ref->count'), please see percpu_ref_put_many(), in which ref->release() > is only called at atomic mode. > > At percpu mode, the ref-count is only decreased/increased on the local CPU. Yes, I got it. Thanks for your kindly response. Sincerely Jianchao