# Re: \[RFC PATCH 1/6\] trace/stack: Move code to save the stack trace into a separate function

- From: Steven Rostedt \<rostedt@goodmis.org\>
- Date: 2021-06-02 14:11:04 
- List: linuxppc-dev
- Page: https://ratatoskr.run/linuxppc-dev/2021/06/1399949
- Thread: https://ratatoskr.run/linuxppc-dev/2021/05/1387040/t.md

```text
On Wed, 02 Jun 2021 16:05:18 +0530
"Naveen N. Rao" [ref] wrote:

> It seems to be working fine otherwise. The one limitation though is down 
> to how ftrace works on powerpc -- the mcount call is before a function 
> sets up its own stackframe. Due to this, we won't ever be able to 
> account for the stackframe from a leaf function -- but, that's a fairly 
> minor limitation.

And this is true for x86 as well because it no longer uses mcount, but
uses fentry instead (called before stack setup), but I figured there's
not much we could do about it.

-- Steve
```