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https://bugs.launchpad.net/bugs/1820868

Title:
  bionic: fork out linux-snapdragon into its own topic kernel

Status in linux package in Ubuntu:
  Fix Released
Status in linux-hwe-edge package in Ubuntu:
  New
Status in linux-meta package in Ubuntu:
  Fix Released
Status in linux-snapdragon package in Ubuntu:
  Fix Committed
Status in linux source package in Bionic:
  Fix Released
Status in linux-hwe-edge source package in Bionic:
  Fix Committed
Status in linux-meta source package in Bionic:
  Fix Released
Status in linux-snapdragon source package in Bionic:
  Fix Released

Bug description:
  Impact:

  During the Bionic cycle, a decision was made to incorporate the 
linux-snapdragon
  kernel into the master branch, thus reducing the number of topic kernels and 
the
  stable maintenance burden.

  But as time passed and new patches were produced by Qualcomm, incorporating 
them
  into master while avoiding to destabilize generic became more and more
  problematic, down to the point where it was not a viable approach
  anymore.

  At that point, the decision was made to fork out linux-snapdragon into its own
  topic kernel (e.g. linux-raspi2), giving more room to incorporate new code
  coming from the Qualcomm tree and avoiding to destabilize any other target in
  generic.

  Fix:

  This is a three step process:

  1) disable building linux-snapdragon from master by applying the attached 
patch
  to bionic/master

  2) create a new bionic/linux-snapdragon branch and reset hard to my
  lp:snapdragon-topic-kernel branch  (see below)

  3) update bionic-meta to point to the new bionic/linux-snapdragon
  kernel

  Regression potential

  From the point of view of bionic/master, this pull request doesn't introduce 
any
  substantial change, and in the future will let us purge generic from several
  external patches.

  While from the point of view of linux-snapdragon, with ~600 code commits and 
~4k
  config changes, this represent a brand new kernel and while great care was 
used
  while putting together this branch, there's clearly a regression potential 
here
  but we can't leave linux-snapdragon stagnate behind the curve, so the sooner 
we
  bite the bullet, the better we can the deal with the eventual fallout.

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