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 will be used to contact
userspace helper utilities to provide SPNEGO packaged Kerberos
tickets which are needed to mount to certain secure servers
(for which more secure Kerberos authentication is required). If
unsure, say N.