linux-kernel - stable 4.16.5 hmm build error

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Date:   Thu, 26 Apr 2018 14:52:26 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        LKML <linux-kernel@...r.kernel.org>
Cc:     Mikhail Nosov <drdeimosnn@...il.com>,
        Arnd Bergmann <arnd@...db.de>,
        Jérôme Glisse <jglisse@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: stable 4.16.5 hmm build error

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