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[Launchpad Bug Tracker <1358920@xxxxxxxxxxxxxxxxxx>]

** Branch linked: lp:~ubuntu-core-dev/debian-installer/ubuntu

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https://bugs.launchpad.net/bugs/1358920

Title:
  Switch kernel to vmlinuz (from vmlinux) on ppc64el

Status in “debian-installer” package in Ubuntu:
  New
Status in “linux” package in Ubuntu:
  Fix Committed
Status in “debian-installer” source package in Utopic:
  New
Status in “linux” source package in Utopic:
  Fix Committed

Bug description:
  Hi,

  May we discuss/implement switching the kernel image type/filename on
  ppc64el from vmlinu*x* to vmlinu*z* ?

  Problem:
  ------------

  In the current situation, some issues occur because of 1) or 2):

  1) the presence of /boot/vmlinu*x*  w/ no debug symbols  (vmlinux conventionally contains debug symbols)
    - systemtap's search path includes it first, and assumes it has debug symbols, and thus fail on probes involving the "kernel" identifier
    - perf had a similar issue on trusty IIRC, which required specifying /proc/kallsyms by hand (it seems automatic on utopic)
  2) the lack of /boot/vmlinu*z*
    - kdump-config (from makedumpfile): only tests for existence of /boot/vmlinu*z*

  .. and potentially others.

  I believe the limiting factors that kept us using vmlinu*x* was either 
   1) yaboot, or 
   2) lack of zImage support for 64el on kernel.

  Neither should be a problem anymore: for 1) ppc64el uses grub only,
  and for 2) 3.16 contains the zImage-support patchset.

  
  Solution Proposal:
  -------------------------

  I had success in building, booting and installing utopic w/ vmlinuz.

  Attaching the (trivial) patches for the kernel (ubuntu-utopic.git,
  master branch) and debian-installer (src pkg).

  The install w/ mini.iso finished successfully. Although it ended up
  installing vmlinux (it download linux-image from Canonical, I guess),
  it was just a matter of installing the patched linux-image package to
  get vmlinuz installed and booted successfully.

  If there's no objection/more fixes to do, I'd submit the kernel patch
  on the kernel-team mailing list, and check what's needed to get this
  back on trusty (zImage support has 16 patches IIRC).

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