APPLIED/Cmt: [SRU mantic/linux, jammy/linux, focal/linux, bionic/linux, xenial/linux LP#2055686] drop internal ABI checks

[Roxana Nicolescu]

On 01/03/2024 15:09, Andy Whitcroft wrote:
> We currently check for ABI changes in the kernel packaging during kernel
> builds.  This prevents us building kernels which do not meet ABI
> constraints, for example those which unexpectedly drop a module.
>
> This mechanism has some downsides.  Firstly we must maintain the
> internal copy of the ABI data from the previous kernel upload to
> facilitate delta detection.  Secondly configuration changes can lead to
> the loss of a module which is desired but not immediatly obvious leading
> to build failures and additional uploads must be performed to recover
> wasting developer time.
>
> Our critical requirement is to not sign or release kernels which do not
> meet our criteria.  We already validate signing compatibility and
> upgradabilty externally gating signing and releasing on those criteria
> via the Stable Workflow Manager (SWM).  It makes sense to perform the
> ABI checks in the same manner.  SWM has already been modified to use the
> produced linux-buildinfo data to perform the equivalent checks and
> report those for the kernel via an `abi-testing` task on the associated
> tracker.  We therefore propose dropping ABI checks and history data
> from the main package trees.
>
> Following this email are patches for all of the current live stable
> series.  Proposing for mantic/linux, jammy/linux, focal/linux,
> bionic/linux, and xenial/linux.
>
> -apw
I moved the buglink reference at the beginning of the commit message.
Applied to mantic, jammy, focal, bionic, xenial master-next branches. 
Thanks!
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