linux-kernel - Re: [PATCH 03/11] jump label: Base patch for jump label

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Date:	Fri, 24 Sep 2010 09:54:20 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Jason Baron <jbaron@...hat.com>
Cc:	Mathieu Desnoyers <compudj@...stal.dyndns.org>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Andi Kleen <andi@...stfloor.org>,
	David Miller <davem@...emloft.net>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Rusty Russell <rusty@...tcorp.com.au>
Subject: Re: [PATCH 03/11] jump label: Base patch for jump label

On Thu, 2010-09-23 at 14:40 -0400, Jason Baron wrote:

> I agree that we this synchronization for the module __init section.
> 
> However, I believe we are ok for module removal case. free_module() is
> called *after* blocking_notifier_call_chain() call. The
> blocking_notifier_call_chain() is going to call back into the jump label
> code, grab the jump_label_mutex and remove the reference to the module that
> is about to freed. Thus, the jump label code can no longer reference it.
> 
> So I think the following patch is all that is required here (lightly
> tested).
> 
> Steve, I'll re-post as a separate patch, if we agree on this fix.

Ug, I'm struggling to get ready for my Tokyo trip. I'll try to look at
it on the flight. But I still need to write my presentation :-)

I may have a response back till Monday or Tuesday.

-- Steve


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