# Re: \[PATCH 5/6\] powerpc/livepatch: Add livepatch stack to struct thread\_info

- From: Balbir Singh \<bsingharora@gmail.com\>
- Date: 2016-04-01 01:02:39 
- List: linuxppc-dev
- Page: https://ratatoskr.run/linuxppc-dev/2016/04/4720083
- Thread: https://ratatoskr.run/lkml/2016/03/4715212/t.md

```text


On 24/03/16 22:04, Michael Ellerman wrote:
> In order to support live patching we need to maintain an alternate
> stack of TOC & LR values. We use the base of the stack for this, and
> store the "live patch stack pointer" in struct thread_info.
>
> Unlike the other fields of thread_info, we can not statically initialise
> that value, so it must be done at run time.
>
> This patch just adds the code to support that, it is not enabled until
> the next patch which actually adds live patch support.
>
> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
> ---
>  arch/powerpc/include/asm/livepatch.h   |  8 ++++++++
>  arch/powerpc/include/asm/thread_info.h |  4 +++-
>  arch/powerpc/kernel/irq.c              |  3 +++
>  arch/powerpc/kernel/process.c          |  6 +++++-
>  arch/powerpc/kernel/setup_64.c         | 17 ++++++++++-------
>  5 files changed, 29 insertions(+), 9 deletions(-)
>
>

Acked-by: Balbir Singh <bsingharora@gmail.com>
```