linux-kernel - Re: [RFC PATCH 4/5] samples: livepatch: init reloc list and mark as klp module

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Date:	Wed, 11 Nov 2015 16:42:49 +0100
From:	Petr Mladek <pmladek@...e.com>
To:	Jessica Yu <jeyu@...hat.com>
Cc:	Rusty Russell <rusty@...tcorp.com.au>,
	Josh Poimboeuf <jpoimboe@...hat.com>,
	Seth Jennings <sjenning@...hat.com>,
	Jiri Kosina <jikos@...nel.org>,
	Vojtech Pavlik <vojtech@...e.com>,
	Miroslav Benes <mbenes@...e.cz>, linux-api@...r.kernel.org,
	live-patching@...r.kernel.org, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 4/5] samples: livepatch: init reloc list and mark as
 klp module

On Mon 2015-11-09 23:45:54, Jessica Yu wrote:
> Intialize the list of relocation sections in the sample
> klp_object (even if the list will be empty in this case).
> Also mark module as a livepatch module so that the module
> loader can appropriately initialize it.
> 
> Signed-off-by: Jessica Yu <jeyu@...hat.com>
> ---
>  samples/livepatch/livepatch-sample.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/samples/livepatch/livepatch-sample.c b/samples/livepatch/livepatch-sample.c
> index fb8c861..2ef9345 100644
> --- a/samples/livepatch/livepatch-sample.c
> +++ b/samples/livepatch/livepatch-sample.c
> @@ -89,3 +90,4 @@ static void livepatch_exit(void)
>  module_init(livepatch_init);
>  module_exit(livepatch_exit);
>  MODULE_LICENSE("GPL");
> +MODULE_INFO(livepatch, "Y");

This looks a bit error prone. I wonder if we could detect this
information another way. For example, by a check for the
livepatch-related elf sections. If it is missing,
we do not need to preserve struct load_info even
when it is a livepatch.

Best Regards,
Petr
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