[External] Re: Question - Livepatch/Kprobe Coexistence on Ftrace-enabled Functions (Ubuntu kernel based on Linux stable 5.15.30)

[Song Liu]

On Tue, Oct 21, 2025 at 7:09 AM Steven Rostedt <rostedt at goodmis.org> wrote:
>
> On Mon, 20 Oct 2025 23:07:26 -0700
> Song Liu <song at kernel.org> wrote:
>
> > commit a8b9cf62ade1bf17261a979fc97e40c2d7842353
> > Author: Masami Hiramatsu (Google) <mhiramat at kernel.org>
> > Date: 1 year, 9 months ago
> > ftrace: Fix DIRECT_CALLS to use SAVE_REGS by default
>
> Hmm, this is a work around. I wonder if we can make this work with ARGS as
> well? Hmm. I'll have to take a look when I get a chance.

Given both ftrace_caller and arch_prepare_bpf_trampoline are created
per arch, I think it is possible. But I guess it may require quite some work
to update and test each architecture?

Thanks,
Song