On Mon, 19 Apr 2021 22:51:46 +0200 Jiri Olsa <jolsa@xxxxxxxxxx> wrote: > now, it looks like the fgraph_ops entry callback does not have access > to registers.. once we have that, we could store arguments for the exit > callback and have all in place.. could this be added? ;-) Sure. The only problem is that we need to do this carefully to not break all the architectures that support function graph tracing. For function tracing, I usually add "CONFIG_HAVE_..." configs that state if the architecture supports some ftrace feature, and if it does it can use a different callback prototype. But it does get messy. Ideally, I would love to go and update all architectures to support all features, but that requires understanding the assembly of all those architectures :-p To test that I don't break other archs, I usually just support x86_64 and leave x86_32 behind. I mean, who cares about x86_32 anymore ;-) -- Steve
