Kerberos/SPNEGO advanced session setup (EXPERIMENTAL)

configname: CONFIG_CIFS_UPCALL

Linux Kernel Configuration
└─>File systems
└─>Network File Systems
└─>Kerberos/SPNEGO advanced session setup (EXPERIMENTAL)
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
Enables an upcall mechanism for CIFS which accesses
userspace helper utilities to provide SPNEGO packaged (RFC 4178)
Kerberos tickets which are needed to mount to certain secure servers
(for which more secure Kerberos authentication is required). If
unsure, say N.