linux-kernel - Re: [PATCH] /dev/random: Insufficient of entropy on many architectures

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Message-ID: <52322835.8040803@zytor.com>
Date:	Thu, 12 Sep 2013 13:46:45 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	"Theodore Ts'o" <tytso@....edu>,
	John Stultz <john.stultz@...aro.org>,
	Stephan Mueller <smueller@...onox.de>,
	LKML <linux-kernel@...r.kernel.org>, dave.taht@...ferbloat.net,
	Frederic Weisbecker <fweisbec@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] /dev/random: Insufficient of entropy on many architectures

On 09/10/2013 05:50 PM, Theodore Ts'o wrote:
> 
> Right now, if get_cycles() returns 0, we fall back to only mixing in
> the IP register from the interrupt plus the jiffies counter.  The
> platforms where get_cycles returns 0 is:
> 
> - User mode Linux

UML (on x86) should be able to use RDTSC just fine; it might be
meaningless for anything *other* than random though...

	-hpa


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