# Re: powerpc/64s/radix: Fix radix\_kvm\_prefetch\_workaround paca access of not possible CPU

- From: Michael Ellerman \<hidden\>
- Date: 2018-06-23 12:56:03 
- List: linuxppc-dev
- Page: https://ratatoskr.run/linuxppc-dev/2018/06/9504818
- Thread: https://ratatoskr.run/linuxppc-dev/2018/06/9504624/t.md

```text
On Tue, 2018-06-12 at 09:38:08 UTC, Nicholas Piggin wrote:
> If possible CPUs are limited (e.g., by kexec), then the kvm prefetch
> workaround function can access the paca pointer for a !possible CPU.
> 
> Fixes: d2e60075a3d44 ("powerpc/64: Use array of paca pointers and allocate pacas individually")
> Cc: stable@kernel.org
> Reported-by: Pridhiviraj Paidipeddi <redacted>
> Tested-by: Pridhiviraj Paidipeddi <redacted>
> Signed-off-by: Nicholas Piggin <npiggin@gmail.com>

Applied to powerpc fixes, thanks.

https://git.kernel.org/powerpc/c/758380b8155f69b4e2f77f27562f8a

cheers
```