Optimizing compilers can, under some circumstances, infer when a parameter to a function is not needed, and remove it. This is all well and good until the kernel's tracing or BPF subsystems need information on how to call the function or where its arguments are stored.
Alan Maguire and Yonghong Song spoke at the 2026

Linux
Storage, Filesystem, Memory-Management, and BPF Summit about their work on recording information regarding changed function signatures in the kernel's BTF debugging
information, to better support tracing such functions.

https://lwn.net/Articles/1073762/
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