linux-kernel - Re: [PATCH] Make rcutorture RNG use temporal entropy

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Message-Id: <20070817115356.cb201e42.akpm@linux-foundation.org>
Date:	Fri, 17 Aug 2007 11:53:56 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	paulmck@...ux.vnet.ibm.com
Cc:	bunk@...nel.org, josh@...nel.org, linux-kernel@...r.kernel.org,
	mingo@...e.hu
Subject: Re: [PATCH] Make rcutorture RNG use temporal entropy

On Wed, 15 Aug 2007 19:49:04 -0700
"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com> wrote:

> Repost of http://lkml.org/lkml/2007/8/10/472 made available by request.
> 
> The locking used by get_random_bytes() can conflict with the
> preempt_disable() and synchronize_sched() form of RCU.  This patch changes
> rcutorture's RNG to gather entropy from the new cpu_clock() interface
> (relying on interrupts, preemption, daemons, and rcutorture's reader
> thread's rock-bottom scheduling priority to provide useful entropy),
> and also adds and EXPORT_SYMBOL_GPL() to make that interface available
> to GPLed kernel modules such as rcutorture.
> 
> Passes several hours of rcutorture.

Please explain what "conflict with" means so that I can work out if
this is a needed-in-2.6.23 change, thanks.
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