linux-kernel - Re: [RFC PATCH 6/9] livepatch: create per-task consistency model

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Date:	Thu, 12 Feb 2015 14:16:28 +0100
From:	Jiri Slaby <jslaby@...e.cz>
To:	Peter Zijlstra <peterz@...radead.org>,
	Josh Poimboeuf <jpoimboe@...hat.com>
CC:	Ingo Molnar <mingo@...hat.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	live-patching@...r.kernel.org, linux-kernel@...r.kernel.org,
	Seth Jennings <sjenning@...hat.com>,
	Jiri Kosina <jkosina@...e.cz>, Vojtech Pavlik <vojtech@...e.cz>
Subject: Re: [RFC PATCH 6/9] livepatch: create per-task consistency model

Hi,

On 02/12/2015, 02:08 PM, Peter Zijlstra wrote:
> How can one task run new and another task old functions?

because this is how it is designed to work in one of the consistency models.

> Once you patch
> any indirect function pointer any task will see the new call.

It does not patch any pointers. Callees' fentrys are "patched" using ftrace.

> And what's wrong with using known good spots like the freezer?

This was already discussed too. Please STA.

thanks,
-- 
js
suse labs
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