linux-kernel - Re: [PATCH 2/2] kernel: add support for live patching

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Message-ID: <alpine.LNX.2.00.1411062312220.29198@pobox.suse.cz>
Date:	Thu, 6 Nov 2014 23:20:48 +0100 (CET)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Seth Jennings <sjenning@...hat.com>
cc:	Josh Poimboeuf <jpoimboe@...hat.com>,
	Vojtech Pavlik <vojtech@...e.cz>,
	Steven Rostedt <rostedt@...dmis.org>,
	live-patching@...r.kernel.org, kpatch@...hat.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] kernel: add support for live patching

On Thu, 6 Nov 2014, Seth Jennings wrote:

> > Thanks a lot for having started the work on this!
> > 
> > We will be reviewing it carefully in the coming days and will getting back 
> > to you (I was surprised to see that that diffstat indicates that it's 
> > actually more code than our whole kgraft implementation including the 
> > consistency model :) ).
> 
> The structure allocation and sysfs stuff is a lot of (mundane) code.
> Lots of boring error path handling too.

Also, lpc_create_object(), lpc_create_func(), lpc_create_patch(), 
lpc_create_objects(), lpc_create_funcs(), ... they all are pretty much 
alike, and are asking for some kind of unification ... perhaps iterator 
for generic structure initialization?

I am not also really fully convinced that we need the patch->object->funcs 
abstraction hierarchy (which also contributes to the structure allocation 
being rather a spaghetti copy/paste code) ... wouldn't patch->funcs be 
suffcient, with the "object" being made just a property of the function, 
for example?

> Plus, I show that kernel/kgraft.c + kernel/kgraft_files.c is
> 906+193=1099.  I'd say they are about the same size :)

Which is still seem to me to be a ratio worth thinking about improving :)

Thanks,

-- 
Jiri Kosina
SUSE Labs
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