Re: [PATCH v3 03/03]: hwrng: khwrngd derating per device

[Torsten Duwe]

On Mon, Apr 14, 2014 at 09:41:10AM -0700, Andy Lutomirski wrote:
> On Mon, Apr 14, 2014 at 9:06 AM, Torsten Duwe <duwe@xxxxxx> wrote:
> >
> > This patch introduces a derating factor to struct hwrng for
> > the random bits going into the kernel input pool, and a common
> > default derating for drivers which do not specify one.
> >
> > Signed-off-by: Torsten Duwe <duwe@xxxxxxx>
> >
> > ---
> >  drivers/char/hw_random/core.c |   11 ++++++++++-
> >  include/linux/hw_random.h     |    3 +++
> >  2 files changed, 13 insertions(+), 1 deletion(-)
> >
> > --- linux/include/linux/hw_random.h.orig
> > +++ linux/include/linux/hw_random.h
> > @@ -29,6 +29,8 @@
> >   * @read:              New API. drivers can fill up to max bytes of data
> >   *                     into the buffer. The buffer is aligned for any type.
> >   * @priv:              Private data, for use by the RNG driver.
> > + * @derating:          Estimation of true entropy in RNG's bitstream
> > + *                     (per mill).
> 
> I'll bikeshed again: this is a rating, not a *de*rating.  Higher =
> more confidence, at least assuming the comment is right.
> 
You're right. Would anyone object to call it "quality", as in RX signal quality?
In context of a random source that is pretty accurate, I'd say. Other opinions?

	Torsten

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