# Re: powerpc/64: Fix booting large kernels with STRICT\_KERNEL\_RWX

- From: Michael Ellerman \<hidden\>
- Date: 2019-04-21 14:48:03 
- List: linuxppc-dev
- Page: https://ratatoskr.run/linuxppc-dev/2019/04/9509549
- Thread: https://ratatoskr.run/linuxppc-dev/2019/03/9509135/t.md

```text
On Wed, 2019-03-27 at 03:35:54 UTC, Russell Currey wrote:
> With STRICT_KERNEL_RWX enabled anything marked __init is placed at a 16M
> boundary.  This is necessary so that it can be repurposed later with
> different permissions.  However, in kernels with text larger than 16M,
> this pushes early_setup past 32M, incapable of being reached by the
> branch instruction.
> 
> Fix this by setting the CTR and branching there instead.
> 
> Fixes: 1e0fc9d1eb2b ("powerpc/Kconfig: Enable STRICT_KERNEL_RWX for some configs")
> Signed-off-by: Russell Currey <redacted>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/56c46bba9bbfe229b4472a5be313c44c

cheers
```