linux-kernel - Re: [PATCH] livepatch: Add some basic LivePatch documentation

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Message-ID: <alpine.LNX.2.00.1603101005480.3656@cbobk.fhfr.pm>
Date:	Thu, 10 Mar 2016 10:09:00 +0100 (CET)
From:	Jiri Kosina <jikos@...nel.org>
To:	Petr Mladek <pmladek@...e.com>
cc:	Josh Poimboeuf <jpoimboe@...hat.com>, Jessica Yu <jeyu@...hat.com>,
	Vojtech Pavlik <vojtech@...e.com>,
	Miroslav Benes <mbenes@...e.cz>, live-patching@...r.kernel.org,
	linux-kernel@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...hat.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	linuxppc-dev@...abs.org, Balbir Singh <bsingharora@...il.com>,
	Torsten Duwe <duwe@...e.de>,
	Michael Ellerman <mpe@...erman.id.au>
Subject: Re: [PATCH] livepatch: Add some basic LivePatch documentation

On Wed, 9 Mar 2016, Petr Mladek wrote:

> LivePatch framework deserves some documentation, definitely.
> This is an attempt to provide some basic info. I hope that
> it will be useful for both LivePatch producers and also
> potential developers of the framework itself.

Thanks for starting the efforts; this is really needed if we want the 
infrastructure to be used also by someone else than its developers :)

[ ... snip ... ]
> +7. Limitations
> +==============

Miroslav Benes, who is working on creating the actual patches we are 
shipping for our kernels, should already have a decent cheat-sheet 
regarding things that the patch author should be extra careful when 
creating a patch (inlining and other gcc optimizations such as isra, 
functions that use switch_to(), percpu, ...).

I am not really sure whether these should go to limitations, or maybe 
they'd better be placed into a separate chapter, but I'd really like to 
see it included.

Thanks,

-- 
Jiri Kosina
SUSE Labs