[$] Indirect calls in BPF

Anton Protopopov kicked off the BPF track onthe second day of the 2025 Linux Storage, Filesystem,Memory-Management, and BPF Summit with a discussion about permittingindirect calls in BPF. He also spoke about his continuing work onstatic keys, a topic which is related because the implementation of indirectjumps and static keys in the verifier use some of the same mechanisms fortracking indirect control-flow.Although some design work remains to be done, it may soon bepossible to make indirect calls in BPF without any extra work compared to normalC.