# \[PATCH\] lib/decompress\_unxz.c: removing all memory helper functions

- From: H. Peter Anvin \<hpa@zytor.com\>
- Date: 2012-05-25 17:15:09 
- List: linux-arm-kernel
- Page: https://ratatoskr.run/linux-arm-kernel/2012/05/3870385
- Thread: https://ratatoskr.run/linux-arm-kernel/2012/05/3869736/t.md

```text
On 05/25/2012 10:05 AM, Thavatchai Makphaibulcboke wrote:
>> We could do that.  But according to the comment in the original
>> implementation, there seems to be a concern regarding its performance
>> speed. If you believe all archs' memcpy would give comparable
>> performance to the memmove. then I could do that.
>>
> 
> Also how about the case for overlapping buffer, especially when the
> destination is at a higher address?  I do not believe memcpy guarantee
> to work.

memcpy() is not guaranteed to work for any overlap; that is what
memmove() is for.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.
```