# Re: \[PATCH\] vsprintf: Do not break early boot with probing addresses

- From: Sergey Senozhatsky \<hidden\>
- Date: 2019-05-10 08:16:42 
- List: linuxppc-dev
- Page: https://ratatoskr.run/linuxppc-dev/2019/05/5593846
- Thread: https://ratatoskr.run/linuxppc-dev/2019/05/5592853/t.md

```text
On (05/10/19 10:06), Petr Mladek wrote:
[..]
> I am going to send a patch replacing probe_kernel_address() with
> a simple check:
> 
> 	if ((unsigned long)ptr < PAGE_SIZE || IS_ERR_VALUE(ptr))
> 		return "(efault)";

I'm OK with this.
Probing ptrs was a good idea, it just didn't work out.

	-ss
```