For per-netns device unregistration, the list passed to
unregister_netdevice_many() must contain devices from a single
netns only (once all callers are converted).
Let's move collected devices in the following functions to
net->dev_unreg_head and let __rtnl_net_unlock() pass them to
unregister_netdevice_many().
* default_device_exit_batch()
* ops_exit_rtnl_list()
* __rtnl_kill_links()
This allows incremental conversion of each driver to support
per-netns device unregistration without affecting the normal
kernel where CONFIG_DEBUG_NET_SMALL_RTNL is disabled.
Note that this change unbatches synchronize_rcu() etc in
unregister_netdevice_many(), but we can later split it into
multiple stages to batch them again.
Signed-off-by: Kuniyuki Iwashima <kuniyu@google.com>
Link: https://patch.msgid.link/20260703001009.1572444-8-kuniyu@google.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
d0008553a7