Extern or forward variable declaration at include/linux/configfs.h, line 32 References: drivers/hwtracing/coresight/coresight-core.c, line 272 drivers/infiniband/ulp/srpt/ib_srpt.c, line 3831 drivers/nvme/target/loop.c, line 508 drivers/nvme/target/loop.c, line 698 drivers/nvme/target/nvmet.h, line 297 drivers/nvme/target/passthru.c, line 562 drivers/nvme/target/passthru.c, line 576 drivers/scsi/elx/efct/efct_lio.c, line 1602 drivers/scsi/elx/efct/efct_lio.c, line 1637 drivers/scsi/ibmvscsi_tgt/ibmvscsi_tgt.c, line 4014 drivers/scsi/qla2xxx/qla_os.c, line 7921 drivers/scsi/qla2xxx/tcm_qla2xxx.c, line 1843 drivers/scsi/qla2xxx/tcm_qla2xxx.c, line 1890 drivers/target/iscsi/iscsi_target_configfs.c, line 1528 drivers/target/loopback/tcm_loop.c, line 314 drivers/target/loopback/tcm_loop.c, line 1121 drivers/target/sbp/sbp_target.c, line 2299 drivers/target/target_core_fabric_configfs.c, line 44 drivers/target/target_core_fabric_configfs.c, line 57 drivers/target/target_core_user.c, line 477 drivers/usb/gadget/configfs.c, line 1201 drivers/usb/gadget/function/f_tcm.c, line 1709 drivers/vhost/scsi.c, line 2410 drivers/xen/xen-scsiback.c, line 1769 fs/configfs/dir.c, line 1255 fs/configfs/dir.c, line 1435 include/linux/usb/composite.h, line 100 include/linux/usb/composite.h, line 216 include/linux/usb/composite.h, line 585 include/target/iscsi/iscsi_transport.h, line 12 include/target/target_core_backend.h, line 24 include/target/target_core_fabric.h, line 10 include/target/target_core_fabric.h, line 10