linux-kernel - Re: [RFC PATCH v2 1/4] cpuidle: (powerpc) Add cpu_idle_wait() to allow switching of idle routines

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Message-ID: <1322550115.23348.72.camel@pasglop>
Date:	Tue, 29 Nov 2011 18:01:55 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Deepthi Dharwar <deepthi@...ux.vnet.ibm.com>
Cc:	linuxppc-dev@...abs.org, linux-pm@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org
Subject: Re: [RFC PATCH v2 1/4] cpuidle: (powerpc) Add cpu_idle_wait() to
 allow switching of idle routines

On Tue, 2011-11-29 at 12:12 +0530, Deepthi Dharwar wrote:
> 
> Yes, this could be problematic as there is small window for the
> race condition to occur . Otherwise we need to manually schedule
> it by running a kernel thread but this would definitely have a
> overhead and would be an overkill. 

Depends what this "window" is. IE. What are you trying to protect
yourself against ? What's the risk ?

If it's just module unload, then stop_machine is probably your
friend :-)

Cheers,
Ben.


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