linux-kernel - Re: [PATCH 5/6] powerpc/livepatch: Add livepatch stack to struct thread

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Date:	Fri, 1 Apr 2016 12:02:29 +1100
From:	Balbir Singh <bsingharora@...il.com>
To:	Michael Ellerman <mpe@...erman.id.au>, linuxppc-dev@...abs.org
Cc:	duwe@....de, linux-kernel@...r.kernel.org, rostedt@...dmis.org,
	kamalesh@...ux.vnet.ibm.com, pmladek@...e.com, jeyu@...hat.com,
	jkosina@...e.cz, live-patching@...r.kernel.org, mbenes@...e.cz
Subject: Re: [PATCH 5/6] powerpc/livepatch: Add livepatch stack to struct
 thread_info



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@...erman.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@...il.com>