Upstream Ubuntu HWE should support BTF (tracking bug only) about btfhub HOT 4 CLOSED

I have created an email thread, in ubuntu-devel mailing list, at:

• https://lists.ubuntu.com/archives/ubuntu-devel/2021-November/041658.html

from btfhub.

It turns out that the DWARVES binary package has already been backported to Bionic and Focal:

 dwarves-dfsg | 1.21-0ubuntu1~18.04 | bionic-proposed/universe | source
 dwarves-dfsg | 1.21-0ubuntu1~20.04 | focal-updates/universe   | source
 dwarves-dfsg | 1.21-0ubuntu1~21.04 | hirsute-updates/universe | source
 dwarves-dfsg | 1.21-0ubuntu1       | impish/universe          | source
 dwarves-dfsg | 1.21-0ubuntu1       | jammy/universe           | source

at bug https://bugs.launchpad.net/ubuntu/+source/dwarves-dfsg/+bug/1912811

Just spoke to "xnox", from Ubuntu kernel team, and we can expect having BTF support in Ubuntu HWE kernels by the EOY (this way BTFHUB will be able to support all released kernels to that date, and won't need to support newer kernels).

from btfhub.

dwarves-dfsg got released in Ubuntu Bionic. This means that now the kernel changes might be done in order to generate the embedded BTF files in the HWE kernels for Focal and Bionic (by EOY).

from btfhub.

I believe this is already done by Ubuntu upstream (Bionic and Focal kernels support BTF now). The only kernel that does not support embedded BTF is 4.15 and, for that version, we're still updating btfhub-archive.

from btfhub.