linux-kernel - Re: [PATCH v3] kprobes: Disable Kprobe when ftrace arming fails

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Message-ID: <20150323135306.GA25233@gmail.com>
Date:	Mon, 23 Mar 2015 14:53:06 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Petr Mladek <pmladek@...e.cz>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	"David S. Miller" <davem@...emloft.net>,
	Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>,
	Ananth NMavinakayanahalli <ananth@...ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>, Jiri Kosina <jkosina@...e.cz>,
	linux-kernel@...r.kernel.org,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: Re: [PATCH v3] kprobes: Disable Kprobe when ftrace arming fails


* Steven Rostedt <rostedt@...dmis.org> wrote:

> On Mon, 23 Mar 2015 14:34:42 +0100
> Ingo Molnar <mingo@...nel.org> wrote:
> > 
> > Even if it was documented (it isn't), it's pretty weird terminology - 
> > please use clearer formulations, like 'patched function' or 'unpatched 
> > function' or 'function with pending patch'. No need to redefine 
> > existing words in a weird fashion just to create the appearance of 
> > being special ...
> > 
> 
> I think it has to do with their RCU like patching functionality, 
> where some tasks are still executing the old function and others are 
> executing the new function. [...]

That would be the 'function with pending patch' state in my 
description above.

Thanks,

	Ingo
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