Kernel packages much smaller on trixie?

[Tim Woodall <debianuser@woodall.me.uk>]

I haven't migrated anything to trixie yet but I do have a test system.

I've just done a kernel upgrade:

The following NEW packages will be installed:
  initramfs-tools-bin linux-image-6.12.41+deb13-amd64
The following packages will be upgraded:
  initramfs-tools initramfs-tools-core linux-image-amd64
3 upgraded, 2 newly installed, 0 to remove and 0 not upgraded.
Need to get 107 MB of archives.
After this operation, 110 MB of additional disk space will be used.

Compare this with a bookworm upgrade:

The following NEW packages will be installed:
  linux-image-6.1.0-38-amd64
The following packages will be upgraded:
  linux-image-amd64
1 upgraded, 1 newly installed, 0 to remove and 0 not upgraded.
Need to get 69.1 MB of archives.
After this operation, 409 MB of additional disk space will be used.


root@trixie17-build:/lib/modules# du -sc *
110600  6.12.27-amd64
109184  6.12.41+deb13-amd64
219784  total

root@mail17:/lib/modules# du -sc *
403676  6.1.0-37-amd64
403632  6.1.0-38-amd64
807308  total

This is a welcome change but how has it been achieved? I can't 
immediately find any "modules" packages where things might have been 
moved out of the default install.