linux-kernel - Re: [RFC] kreplace: Rebootless kernel updates

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Date:	Mon, 24 Nov 2008 16:37:32 +0530
From:	Nikanth Karthikesan <knikanth@...e.de>
To:	Masami Hiramatsu <mhiramat@...hat.com>
Cc:	linux-kernel@...r.kernel.org, ananth@...ibm.com,
	davem@...emloft.net, contact@...lice.com, jbarnold@...lice.com,
	tabbott@...lice.com, wdaher@...lice.com, andersk@...lice.com
Subject: Re: [RFC] kreplace: Rebootless kernel updates

On Friday 21 November 2008 20:09:52 Masami Hiramatsu wrote:
> Hi Nikanth,
>
> Nikanth Karthikesan wrote:

> Hmm,
> Would you like to replace a function to another function?
> If so, AFAIK, you can do that with kprobe and below pre_handler.
> (see booster enabled path in setup_singlestep())
>
> pre_handler(...)
> {
> 	reset_current_kprobe();	/* this kprobe doesn't need any more */
> 	regs->ip = new_function;	/* change IP to new function */
> 	preempt_enable_no_resched();	/* recover preempt count */
> 	return 1;	/* No need to setup singlestep */
> }
>
>

So, am I seeing worries to enable something, which is already possible, but 
just not documented?

Thanks
Nikanth Karthikesan



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