Hi Eric,
I love your patch! Perhaps something to improve:
[auto build test WARNING on net-next/master]
url:
https://github.com/0day-ci/linux/commits/Eric-Dumazet/net-add-CONFIG_PCPU_DEV_REFCNT/20210319-230417
base: https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git
38cb576
From: Eric Dumazet
I was working on a syzbot issue, claiming one device could not be
dismantled because its refcount was -1
unregister_netdevice: waiting for sit0 to become free. Usage count = -1
It would be nice if syzbot could trigger a warning at the time
this reference count became negative
