Public bug reported:

Functions from mm/huge_memory.c is exported with include/linux/huge_mm.h header 
but only when
 context CONFIG_TRANSPARENT_HUGEPAGE is defined , when 
CONFIG_TRANSPARENT_HUGEPAGE is not set 
missing errors from compiler i expect this on include/linux/huge_mm.h bellow:

#ifdef CONFIG_TRANSPARENT_HUGEPAGE
extern int copy_huge_pmd(struct mm_struct *dst_mm, struct mm_struct *src_mm,
                         pmd_t *dst_pmd, pmd_t *src_pmd, unsigned long addr,
                         struct vm_area_struct *vma);
#else
static inline int copy_huge_pmd(struct mm_struct *dst_mm, struct mm_struct 
*src_mm,
                         pmd_t *dst_pmd, pmd_t *src_pmd, unsigned long addr,
                         struct vm_area_struct *vma)
{
        return 1;
}
#endif
Ensuring to exist defined function when  CONFIG_TRANSPARENT_HUGEPAGE is not set.
On this momment errors message from compiler is suppressed when 
CONFIG_TRANSPARENT_HUGEPAGE is not set.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.4.0-59-generic 4.4.0-59.80
ProcVersionSignature: Ubuntu 4.4.0-59.80-generic 4.4.35
Uname: Linux 4.4.0-59-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.4
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  asu        3544 F.... pulseaudio
CurrentDesktop: MATE
Date: Wed Feb  1 00:08:47 2017
InstallationDate: Installed on 2016-04-29 (277 days ago)
InstallationMedia: Ubuntu-Studio 16.04 LTS "Xenial Xerus" - Release amd64 
(20160420.1)
IwConfig:
 lo        no wireless extensions.
 
 enp1s0    no wireless extensions.
MachineType: Olidata S.p.A. ALABAMA
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.4.0-59-generic 
root=/dev/mapper/192--168--0--108--vg-root ro
RelatedPackageVersions:
 linux-restricted-modules-4.4.0-59-generic N/A
 linux-backports-modules-4.4.0-59-generic  N/A
 linux-firmware                            1.157.6
RfKill:
 
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/08/2008
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: S0101
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: To be filled by O.E.M.
dmi.board.vendor: To be filled by O.E.M.
dmi.board.version: To be filled by O.E.M.
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrS0101:bd07/08/2008:svnOlidataS.p.A.:pnALABAMA:pvrToBeFilledByO.E.M.:rvnTobefilledbyO.E.M.:rnTobefilledbyO.E.M.:rvrTobefilledbyO.E.M.:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.name: ALABAMA
dmi.product.version: To Be Filled By O.E.M.
dmi.sys.vendor: Olidata S.p.A.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug xenial

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https://bugs.launchpad.net/bugs/1660829

Title:
  Undefined func on include/linux/huge_mm.h

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