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net_namespace-device can get registered after module init, e.g. vxlan registers name-space-device on port add. On kernel without namespace support __net_init is defined as __init which cause panic on vxlan port add. Following patch fixes it. BUG: unable to handle kernel paging request at ffffffffa02b6293 IP: [<ffffffffa02b6293>] 0xffffffffa02b6293 PGD 1a87067 PUD 1a8b063 PMD 8371de067 PTE 0 Oops: 0010 [#1] SMP Process ovs-vswitchd (pid: 10330, threadinfo ffff8808367fe000, task f880839e16aa0) Stack: Call Trace: [<ffffffff8144b254>] ? register_pernet_gen_device+0x74/0xd0 [<ffffffffa027e220>] ? vxlan_rcv+0x0/0x60 [openvswitch] [<ffffffffa0280a7b>] vxlan_handler_add+0x3cb/0x480 [openvswitch] [<ffffffffa027e1f4>] vxlan_tnl_create+0xc4/0xf0 [openvswitch] [<ffffffffa027b6f3>] ovs_vport_add+0x53/0xb0 [openvswitch] [<ffffffffa0273bc6>] new_vport+0x16/0x60 [openvswitch] [<ffffffffa0276399>] ovs_vport_cmd_new+0x109/0x210 [openvswitch] [<ffffffff81478f80>] genl_rcv_msg+0x1d0/0x210 [<ffffffff81477e29>] netlink_rcv_skb+0xa9/0xd0 [<ffffffff81478d95>] genl_rcv+0x25/0x40 [<ffffffff81477a63>] netlink_unicast+0x283/0x2d0 [<ffffffff814783de>] netlink_sendmsg+0x1fe/0x2e0 [<ffffffff8143c8d3>] sock_sendmsg+0x123/0x150 [<ffffffff8143e0b6>] __sys_sendmsg+0x406/0x420 [<ffffffff8143e2d9>] sys_sendmsg+0x49/0x90 [<ffffffff8100b072>] system_call_fastpath+0x16/0x1b Code: Bad RIP value. RIP [<ffffffffa02b6293>] 0xffffffffa02b6293 Signed-off-by: Pravin B Shelar <pshelar@nicira.com> Acked-by: Jesse Gross <jesse@nicira.com> Bug #19178