linux-kernel - Re: [POC 11/23] livepatch: Safely detect forced transition when removing split livepatch modules

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Date:   Wed, 22 Jan 2020 10:15:11 +0000
From:   Julien Thierry <jthierry@...hat.com>
To:     Petr Mladek <pmladek@...e.com>, Jiri Kosina <jikos@...nel.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Miroslav Benes <mbenes@...e.cz>
Cc:     Joe Lawrence <joe.lawrence@...hat.com>,
        Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>,
        Nicolai Stange <nstange@...e.de>,
        live-patching@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [POC 11/23] livepatch: Safely detect forced transition when
 removing split livepatch modules

Hi Petr,

On 1/17/20 3:03 PM, Petr Mladek wrote:
> The information about forced livepatch transition is currently stored
> in struct klp_patch. But there is not any obvious safe way how to
> access it when the split livepatch modules are removed.
> 

If that's the only motivation to do this, klp_objects could have a 
reference to the klp_patch they are part of. This could easily be set 
when adding the klp_object to the klp_patch->obj_list in 
klp_init_object_early() .

Having this reference could also prove useful in future scenarios.

Cheers,

-- 
Julien Thierry