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Date:	Wed, 27 Jun 2007 14:57:17 +0200
From:	Michael Buesch <>
To:	Matt Mackall <>
Cc:	Andrew Morton <>,
	Henrique de Moraes Holschuh <>,
	linux-kernel <>
Subject: Re: [PATCH RFC #2] hwrng: Add type categories

On Wednesday 27 June 2007 00:45:18 Matt Mackall wrote:
> On Tue, Jun 26, 2007 at 08:21:51PM +0200, Michael Buesch wrote:
> > Don't use the word "quality", as people seem to think of
> > the entropy quality when hearing that word.
> Why do I so often feel compelled to respond with "did you read what I
> wrote?" on this list?

Because you ignored my explanations.

> > This uses the word "type", which is probably better for
> > understanding what the value really means.
> Please explain:
> a) how is bad different from pseudo?
> b) how is onboard different than dedicated?

Read the Kdoc help text in the patch. It explains it.

> I maintain that there are exactly two categories on this axis: real
> and fake. And I'd rather stomp all over this notion of other
> categories you've invented now before people actually start trying to
> use them.
> There are also two other axes that this approach neglects. Trusted
> (another boolean) and bitrate (a scalar).

No. Read this:
I will explain it once again: It is _just_ to select a default policy
of which RNG is initialized by default. The type does say _nothing_
about the entropy quality or something else. It _just_ judges about
which RNG is preferred for default initialization.
External RNG boards are preferred over internal onboard stuff; onboard
is preferred over bad RNGs like bcm43xx; bcm43xx is preferred over
devices that are not RNGs by definition but could be used as such (sensors).

Greetings Michael.
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