On 03/07/2017 10:08, Wanpeng Li wrote: >> Yeah, I'm not entirely satisfied with it but it's working: start_sw >> timer will see ktimer->pending and do nothing. >> >> But thinking more about it, maybe the "if (r)" can be omitted >> completely? We need to benchmark it but it can be done. > "if (r)" makes codes more understandable, in addition, calling expired > the pending timer here looks weird though ktimer->pending. We can remove the call to apic_timer_expired too (sorry if I was too terse). :) start_sw_period and start_sw_tscdeadline would take care of it. Paolo