Extern or forward variable declaration at include/linux/hyperv.h, line 1606 References: drivers/gpu/drm/hyperv/hyperv_drm_proto.c, line 489 drivers/hv/channel.c, line 300 drivers/hv/channel_mgmt.c, line 735 drivers/hv/channel_mgmt.c, line 736 drivers/hv/channel_mgmt.c, line 897 drivers/hv/channel_mgmt.c, line 934 drivers/hv/connection.c, line 45 drivers/hv/connection.c, line 46 drivers/hv/connection.c, line 321 drivers/hv/vmbus_drv.c, line 1266 drivers/hv/vmbus_drv.c, line 1370 drivers/hv/vmbus_drv.c, line 1371 drivers/hv/vmbus_drv.c, line 1819 drivers/hv/vmbus_drv.c, line 2590 drivers/hv/vmbus_drv.c, line 2591 drivers/hv/vmbus_drv.c, line 2603 drivers/net/hyperv/netvsc.c, line 730 drivers/net/hyperv/netvsc.c, line 734 drivers/net/hyperv/netvsc.c, line 759 drivers/scsi/storvsc_drv.c, line 1979 drivers/video/fbdev/hyperv_fb.c, line 637 include/linux/hyperv.h, line 1606 net/vmw_vsock/hyperv_transport.c, line 369 net/vmw_vsock/hyperv_transport.c, line 908