# Re: \[PATCH 2/4\] ppc32/kprobe: introduce copy\_exc\_stack

- From: tiejun.chen \<hidden\>
- Date: 2011-12-13 04:59:38 
- List: linuxppc-dev
- Page: https://ratatoskr.run/linuxppc-dev/2011/12/9467665
- Thread: https://ratatoskr.run/linuxppc-dev/2011/12/9467627/t.md

```text
Benjamin Herrenschmidt wrote:
> On Mon, 2011-12-12 at 16:50 +0800, Tiejun Chen wrote:
>> We need a copy mechanism to migrate exception stack. But looks copy_page()
>> already implement this well so we can complete copy_exc_stack() based on
>> that directly.
> 
> I'd rather you don't hijack copy_page which is quite sensitive. The
> emulation isn't performance critical so a "dumber" routine would work

Yes, I just think we should introduce good performance so I 'steal' the original
copy_page().

> fine.
> 
> Why not use memcpy ? You can call it from assembly.

I'd like to switch to memcpy.

Thanks
Tiejun
```