# Re: \[PATCH V38 15/29\] acpi: Ignore acpi\_rsdp kernel param when the kernel has been locked down

- From: Matthew Garrett \<hidden\>
- Date: 2019-08-14 18:02:47 
- List: linux-api
- Page: https://ratatoskr.run/linux-api/2019/08/5688276
- Thread: https://ratatoskr.run/linux-security-module/2019/08/5681185/t.md

```text
On Wed, Aug 14, 2019 at 10:46 AM Borislav Petkov [ref] wrote:
> Yeah, ok, I see what you're doing there. AFAICT, you do that in
>
> setup_arch->acpi_boot_table_init-> ... -> acpi_os_get_root_pointer()

Right.

> I hope nothing needs it earlier because then we'll have to restructure
> again...

Passing the RSDP via command line is a pretty grotesque hack - we
should just set up boot params in kexec_file, which would leave this
as a problem for legacy kexec and nothing else.
```