zfs.ko no longer loads after r320156: unresolved symbol: abd_is_linear

[Ngie Cooper]

Hi,
	I tried upgrading my host from 11.1-STABLE to 12.0-CURRENT, and it didn’t work because abd_is_linear is an undefined symbol (it exists in sys/conf/files, but not sys/modules/zfs/Makefile). I tried adding abd.c to sys/modules/zfs/Makefile and it didn’t immediately fix my compilation problem (ran into a linker error instead).
	If it isn’t fixed in the next few hours I’ll try my hand at fixing the problem.
Thank you,
-Ngie