CONFIG_SUNRPC_BACKCHANNEL (not configurable)

configname: CONFIG_SUNRPC_BACKCHANNEL

Linux Kernel Configuration
└─>File systems
└─>Network File Systems
└─>SUNRPC_BACKCHANNEL
In linux kernel since version 3.1 (release Date: 2011-10-24)  

is depended by
CONFIG_NFS_V4_1