[Bug 2095138] Re: Failed to build against linux-generic 6.8 and 6.11 with stable backports:

[Ubuntu Foundations Team Bug Bot]

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https://bugs.launchpad.net/bugs/2095138

Title:
  Failed to build against linux-generic 6.8 and 6.11 with stable
  backports:

Status in backport-iwlwifi-dkms package in Ubuntu:
  In Progress
Status in backport-iwlwifi-dkms source package in Jammy:
  In Progress
Status in backport-iwlwifi-dkms source package in Noble:
  In Progress
Status in backport-iwlwifi-dkms source package in Oracular:
  In Progress
Status in backport-iwlwifi-dkms source package in Plucky:
  In Progress

Bug description:
  We bump into a few problems when dealing with ABI/API breakages due to
  stable fixes backports:

  1. KERNEL_VERSON has limits for the 3 numbers. They must be under 255
  or saturated to 255. While stable updates can go way beyong, e.g.
  v4.4.302, v4.9.337, v4.14.336, v4.19.325, v5.4.288, the next one going
  break the ceiling soon is v5.10.232, and v5.15.175 is on the way, too.
  We cannot use KERNEL_VERSON to detect ABI/API changes in such cases.

  2. Ubuntu kernels may backport those stable fixes out of the original
  order, meaning the applied version may differ between
  mainline/generic/derived kernels.

  3. generic-6.8 is tracking v6.6.y and v6.10.y, and the KERNEL_VERSION
  will stay 6.8.12(?) forever, becase we simply cannot change it to
  6.6.x nor 6.10.x.

  In these situations, we need some kind of build time detection, and
  zfs already has such mechanism.

  This is a follow-up for bug 2089385.

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