kernel-packages team mailing list archive

[Mauricio Faria de Oliveira <mauricfo@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

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).

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

** Patch added: "ppc64el-vmlinuz-kernel.patch"
   https://bugs.launchpad.net/bugs/1358920/+attachment/4181880/+files/ppc64el-vmlinuz-kernel.patch

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1358920

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

Status in “linux” package in Ubuntu:
  New

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).

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1358920/+subscriptions