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[Tim Gardner <tim.gardner@xxxxxxxxxxxxx>]

Commit 92b9af9e4f144535c65aee673cfad309f25fa465 ('x86: i915 needs
pgprot_writecombine() and is_io_mapping_possible()') is where that
symbol is exported. You could send an email to Ingo Molnar
<mingo@xxxxxxx> and see if he is interested in relaxing that export.

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https://bugs.launchpad.net/bugs/1564470

Title:
  Unable to install NI-VISA nikal kernel module because of GPL-only
  symbol 'pgprot_writecombine'

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Steps to reproduce:
  1. Login to National Instruments site
  2. Download NI-VISA 15.0 for linux (NI-VISA-15.0.0.iso).
  3. Launch its installation by "sudo ./INSTALL"
  4. Get errors on nikal kernel modules compilation about "pgprot_writecombine" symbol ("nikal: FATAL: modpost: GPL-incompatible module nikal.ko uses GPL-only symbol 'pgprot_writecombine'")

  Temporary solution:
  1. Edit /usr/src/linux-headers-4.4.0-16-generic/Module.symvers
  and change line
     0xd544e902	pgprot_writecombine	vmlinux	EXPORT_SYMBOL_GPL
  to
     0xd544e902	pgprot_writecombine	vmlinux	EXPORT_SYMBOL
  2. Edit /boot/abi-4.4.0-16-generic
  and change line 
     EXPORT_SYMBOL_GPL vmlinux 0xd544e902	pgprot_writecombine
  to
     EXPORT_SYMBOL vmlinux 0xd544e902	pgprot_writecombine

  but it does not help - I get "nikal: Unknown symbol
  pgprot_writecombine (err 0)" in syslog.

  Expected results:
  0. The 'pgprot_writecombine' symbol is exported as EXPORT_SYMBOL
  1. Ubuntu can compile and load NI nikal module.

  Actual results:
  Unable to use NI-VISA under Ubuntu.

  Reference (openSUSE):
  http://forums.ni.com/t5/Instrument-Control-GPIB-Serial/GPL-incompatible-module-nikal-ko/td-p/3218730

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-16-generic 4.4.0-16.32
  ProcVersionSignature: Ubuntu 4.4.0-16.32-generic 4.4.6
  Uname: Linux 4.4.0-16-generic i686
  ApportVersion: 2.20-0ubuntu3
  Architecture: i386
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  flash      1549 F.... pulseaudio
   /dev/snd/controlC0:  flash      1549 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Thu Mar 31 18:16:37 2016
  InstallationDate: Installed on 2016-03-26 (4 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Beta i386 (20160323)
  IwConfig:
   lo        no wireless extensions.

   enp1s0    no wireless extensions.
  MachineType: Gigabyte Technology Co., Ltd. To be filled by O.E.M.
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-16-generic root=UUID=eab7b488-5040-499c-afd8-21a7ce9e2383 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-16-generic N/A
   linux-backports-modules-4.4.0-16-generic  N/A
   linux-firmware                            1.157
  RfKill:

  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 01/09/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: FD
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: F2A55M-DS2
  dmi.board.vendor: Gigabyte Technology Co., Ltd.
  dmi.board.version: x.x
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrFD:bd01/09/2014:svnGigabyteTechnologyCo.,Ltd.:pnTobefilledbyO.E.M.:pvrTobefilledbyO.E.M.:rvnGigabyteTechnologyCo.,Ltd.:rnF2A55M-DS2:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.name: To be filled by O.E.M.
  dmi.product.version: To be filled by O.E.M.
  dmi.sys.vendor: Gigabyte Technology Co., Ltd.

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