On Fri, Jan 12, 2024 at 05:20:39PM +0100, Jiri Olsa wrote: > On Sat, Jan 06, 2024 at 11:24:07AM -0700, Daniel Xu wrote: > > === Description === > > > > This is a bpf-treewide change that annotates all kfuncs as such inside > > .BTF_ids. This annotation eventually allows us to automatically generate > > kfunc prototypes from bpftool. > > > > We store this metadata inside a yet-unused flags field inside struct > > btf_id_set8 (thanks Kumar!). pahole will be taught where to look. > > > > More details about the full chain of events are available in commit 3's > > description. > > > > The accompanying pahole changes (still needs some cleanup) can be viewed > > here on this "frozen" branch [0]. > > so the plan is to have bpftool support to generate header file > with detected kfuncs? Yep, that's the major use case. But I see other use cases as well like precision probing of kfuncs. Rather than guess and check which progs can load (in the event of backwards incompatible kfunc changes), programs can look at kfunc type signature thru BTF.
