fs/crypto/Makefile - third_party/linux - Git at Google

 obj-$(CONFIG_FS_ENCRYPTION)	+= fscrypto.o

 fscrypto-y := crypto.o fname.o policy.o keyinfo.o
 fscrypto-$(CONFIG_BLOCK) += bio.o
	obj-$(CONFIG_FS_ENCRYPTION) += fscrypto.o

	fscrypto-y := crypto.o fname.o policy.o keyinfo.o
	fscrypto-$(CONFIG_BLOCK) += bio.o