[Bug 1695093] Re: arm64: "unsupported RELA relocation: 275" loading certain modules

[dann frazier]

Here's a backport of the gcc-6 fix to gcc-5. It includes a backport of
the -mpc-relative-literal-loads option rename change, since it was a
dependent patch, and I'm not comfortable enough w/ gcc development to do
the backport w/o it.

** Patch added: "gcc-5-backport.debdiff"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1695093/+attachment/4912990/+files/gcc-5-backport.debdiff

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https://bugs.launchpad.net/bugs/1695093

Title:
  arm64: "unsupported RELA relocation: 275" loading certain modules

Status in Linux:
  In Progress
Status in gcc-5 package in Ubuntu:
  New
Status in gcc-6 package in Ubuntu:
  Confirmed
Status in linux package in Ubuntu:
  Confirmed
Status in gcc-5 source package in Xenial:
  Confirmed
Status in gcc-6 source package in Xenial:
  Invalid
Status in linux source package in Xenial:
  Confirmed
Status in gcc-5 source package in Yakkety:
  New
Status in gcc-6 source package in Yakkety:
  Confirmed
Status in linux source package in Yakkety:
  Confirmed
Status in gcc-5 source package in Zesty:
  New
Status in gcc-6 source package in Zesty:
  Confirmed
Status in linux source package in Zesty:
  Confirmed

Bug description:
  With the hwe-z kernel:

  ubuntu at grotian:~$ sudo modprobe libceph
  modprobe: ERROR: could not insert 'libceph': Exec format error
  ubuntu at grotian:~$ dmesg
  [66988.470307] module libceph: unsupported RELA relocation: 275

  This symptom is similar to LP: #1533009 but, in that case it impacted
  all modules, and the fix for that appears to remain in place.

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