include/linux/byteorder/Kbuild - kernel/msm-4.9 - Gitiles

 header-y += big_endian.h
 header-y += little_endian.h
 header-y += pdp_endian.h

 unifdef-y += generic.h
 unifdef-y += swabb.h
 unifdef-y += swab.h
	header-y += big_endian.h
	header-y += little_endian.h
	header-y += pdp_endian.h

	unifdef-y += generic.h
	unifdef-y += swabb.h
	unifdef-y += swab.h