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Message-ID: <20240505210024.2veie34wkbwkqggl@treble>
Date: Sun, 5 May 2024 14:00:24 -0700
From: Josh Poimboeuf <jpoimboe@...nel.org>
To: zhangwarden@...il.com
Cc: mbenes@...e.cz, jikos@...nel.org, pmladek@...e.com,
joe.lawrence@...hat.com, live-patching@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH] livepatch.h: Add comment to klp transition state
On Mon, Apr 29, 2024 at 03:26:28PM +0800, zhangwarden@...il.com wrote:
> From: Wardenjohn <zhangwarden@...il.com>
>
> livepatch.h use KLP_UNDEFINED\KLP_UNPATCHED\KLP_PATCHED for klp transition state.
> When livepatch is ready but idle, using KLP_UNDEFINED seems very confusing.
> In order not to introduce potential risks to kernel, just update comment
> to these state.
> ---
> include/linux/livepatch.h | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/include/linux/livepatch.h b/include/linux/livepatch.h
> index 9b9b38e89563..b6a214f2f8e3 100644
> --- a/include/linux/livepatch.h
> +++ b/include/linux/livepatch.h
> @@ -18,9 +18,9 @@
> #if IS_ENABLED(CONFIG_LIVEPATCH)
>
> /* task patch states */
> -#define KLP_UNDEFINED -1
> -#define KLP_UNPATCHED 0
> -#define KLP_PATCHED 1
> +#define KLP_UNDEFINED -1 /* idle, no transition in progress */
> +#define KLP_UNPATCHED 0 /* transitioning to unpatched state */
> +#define KLP_PATCHED 1 /* transitioning to patched state */
Instead of the comments, how about we just rename them to
KLP_TRANSITION_IDLE
KLP_TRANSITION_UNPATCHED
KLP_TRANSITION_PATCHED
which shouldn't break userspace AFAIK.
--
Josh
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