# Re: \[PATCH v7 01/17\] unwind\_user: Add user space unwinding API

- From: Josh Poimboeuf \<jpoimboe@kernel.org\>
- Date: 2025-05-04 17:53:58 
- List: linux-trace-kernel
- Page: https://ratatoskr.run/linux-trace-kernel/2025/05/3039229
- Thread: https://ratatoskr.run/linux-trace-kernel/2025/05/3038060/t.md

```text
On Sun, May 04, 2025 at 12:43:30PM -0400, Steven Rostedt wrote:
> On Sun, 4 May 2025 11:30:32 +0200
> Ingo Molnar [ref] wrote:
> 
> > > +struct unwind_user_state {
> > > +	unsigned long ip;
> > > +	unsigned long sp;
> > > +	unsigned long fp;
> > > +	enum unwind_user_type type;
> > > +	bool done;
> > > +};  
> > 
> > Will any of these types be visible to tooling via ABIs?
> 
> Not that I'm aware of. Josh can confirm. Josh?
> 
> With the exception of BTF (which exposes pretty much all structures), I
> believe this is completely internal for the generic code of the unwinder.

Correct, these types are strictly internal to the kernel.

-- 
Josh
```