[$] Kernel hackers at Cauldron, 2025 edition

The GNU Tools Cauldron is almost entirely focused on user-space tools, but
kernel developers need a solid toolchain too. In what appears to be a
developing tradition (started in 2024),
some kernel developers attended the 2025 Cauldron for the
second year in a row to discuss their needs with the assembled toolchain
developers. Topics covered in this year's gathering include Rust, better
BPF type
format (BTF) support, SFrame, and more.