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[Ubuntu Foundations Team Bug Bot <1327619@xxxxxxxxxxxxxxxxxx>]

** Tags added: patch

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https://bugs.launchpad.net/bugs/1327619

Title:
  kernel version detection in module build

Status in “linux” package in Ubuntu:
  Fix Committed
Status in “linux” source package in Trusty:
  Fix Committed
Status in “linux” source package in Utopic:
  Fix Committed

Bug description:
  When building an external kernel module against an Ubuntu kernel it
  would help to be able to include some special code for some specific
  Ubuntu kernel version.

  I want to ship a kernel module in source code which the user should be
  able to compile against mainline kernels and various distribution
  kernels like the Ubuntu kernel, it would help if there is some way to
  identify the version of the Ubuntu kernel.

  To identify the kernel version it creates a file in include/generated/uapi/linux/version.h and then I can use something like:
  #if LINUX_VERSION_CODE >= KERNEL_VERSION(3,14,0)
  /* some code */
  #else
  /* some code */
  #endif

  The problem is that your kernel is not 100% API compatible with the
  mainline kernel and in some cases such a detection is also needed
  based on the Ubuntu kernel version used.

  RedHat extended this file with some version information about the RHEL
  kernel in use:

  #define LINUX_VERSION_CODE 132640
  #define KERNEL_VERSION(a,b,c) (((a) << 16) + ((b) << 8) + (c))
  #define RHEL_MAJOR 6
  #define RHEL_MINOR 5
  #define RHEL_RELEASE_VERSION(a,b) (((a) << 8) + (b))
  #define RHEL_RELEASE_CODE 1541
  #define RHEL_RELEASE "430"

  I would like to see something like this also in the Ubuntu kernel
  (e.g. 3.13.0-27-generic) and in the long term kernel versions (e.g.
  3.13.11.2) provided by Canonical.

  My current problem is that I do not know if the kernel I am compiling against has this backport in or not:
  http://kernel.ubuntu.com/git?p=ubuntu/ubuntu-trusty.git;a=commitdiff;h=f4c342cdce8acfaef2d89a800bb6a10128d802c8

  Adding some version to the kernel will help the backports project.
  https://backports.wiki.kernel.org/

  This problem effects at least trusty, but probably all versions,
  having such a feature in Debian would also be nice, but I have not
  checked. SLES already has a similar feature.

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