stable 4.16.5 hmm build error

[Randy Dunlap]

https://bugzilla.kernel.org/show_bug.cgi?id=199515

kernel/fork.o: In function `__mmdrop':
/kernel/build_kernel/linux-4.16.4/kernel/fork.c:600: undefined reference to `hmm_mm_destroy'

"It is also reproduced in linux-4.16.5"


There have been a few attempts to fix this build error.  The kernel mainline
repo seems to have it fixed, but it looks to me like Arnd's latest patch
(9d8a463a7016e: "mm/hmm: fix header file if/else/endif maze, again")
was mis-merged to 4.16.5 stable.

Please take a look.  Do you already have a fixup for this?

thanks,
-- 
~Randy