Symbol: USER_NS [=y] │
│ Type : bool │
│ Defined at init/Kconfig:1230 │
│ Prompt: User namespace │
│ Depends on: NAMESPACES [=y] │
│ Location: │
│ Main menu │
│ -> General setup │
│ -> Namespaces support (NAMESPACES [=y])

谢谢@低频思考者指导