netdev - Re: [PATCH 3/4] [Net] Support Xen accelerated network plugin modules

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Message-ID: <p73k5uxcs2v.fsf@bingen.suse.de>
Date:	25 May 2007 08:53:12 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Kieran Mansley <kmansley@...arflare.com>
Cc:	Stephen Hemminger <shemminger@...ux-foundation.org>,
	xen-devel@...ts.xensource.com, netdev@...r.kernel.org,
	muli@...ibm.com, herbert@...dor.apana.org.au
Subject: Re: [PATCH 3/4] [Net] Support Xen accelerated network plugin modules

Kieran Mansley <kmansley@...arflare.com> writes:

> RCU on its own wouldn't
> prevent the accelerated plugin being unloaded while netfront was using
> one of the hooks. 

Note that module unload does always does a stop_machine() which is much 
stronger than normal RCU. As long as you don't sleep and cannot be preemptable
it should be always safe.

-Andi
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