On 2018-10-18 18:00:05 [+0900], Toshiaki Makita wrote: > On 2018/10/18 17:47, Sebastian Andrzej Siewior wrote: > > On 2018-10-17 14:48:02 [+0800], Jason Wang wrote: > >> > >> On 2018/10/17 上午9:13, Toshiaki Makita wrote: > >>> I'm not sure what condition triggered this warning. > > > > If the seqlock is acquired once in softirq and then in process context > > again it is enough evidence for lockdep to trigger this warning. > > No. As I said that should not happen because of NAPI guard. Again: lockdep saw the lock in softirq context once and in process context once and this is what triggers the warning. It does not matter if NAPI is enabled or not during the access in process context. If you want to allow this you need further lockdep annotation…
… but: refill_work() disables NAPI for &vi->rq[1] and refills + updates stats while NAPI is enabled for &vi->rq[0]. Sebastian _______________________________________________ Virtualization mailing list [email protected] https://lists.linuxfoundation.org/mailman/listinfo/virtualization
