Linux-2.6.33.2/security/smack/Kconfig

config SECURITY_SMACK
	bool "Simplified Mandatory Access Control Kernel Support"
	depends on NETLABEL && SECURITY_NETWORK
	default n
	help
	  This selects the Simplified Mandatory Access Control Kernel.
	  Smack is useful for sensitivity, integrity, and a variety
	  of other mandatory security schemes.
	  If you are unsure how to answer this question, answer N.