Re: [PATCH 5/6] powerpc/livepatch: Add livepatch stack to struct thread_info

Balbir Singh
2016-04-01T01:02:39Z

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>