cast_user
#define cast_user(ptr) /* nop for bpf prog. emitted by LLVM */
#define cast_user(ptr) bpf_addr_space_cast(ptr, 1, 0)
#define cast_user(ptr) /* nop for user space */
#define cast_user(ptr) /* nop for bpf prog. emitted by LLVM */
#define cast_user(ptr) bpf_addr_space_cast(ptr, 1, 0)
#define cast_user(ptr) /* nop for user space */