linux-kernel - Re: [PATCH 01/10] random: make 'add_interrupt

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Message-ID: <CA+55aFyMYVLCW0OYTVttkjjOwyu9VgDM9haNC=BeoRCEiWWNPQ@mail.gmail.com>
Date:	Thu, 5 Jul 2012 11:52:17 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Matt Mackall <mpm@...enic.com>
Cc:	"Theodore Ts'o" <tytso@....edu>,
	Linux Kernel Developers List <linux-kernel@...r.kernel.org>,
	w@....eu, ewust@...ch.edu, zakir@...ch.edu, greg@...ah.com,
	nadiah@...ucsd.edu, jhalderm@...ch.edu, tglx@...utronix.de,
	davem@...emloft.net, stable@...nel.org
Subject: Re: [PATCH 01/10] random: make 'add_interrupt_randomness()' do
 something sane

On Thu, Jul 5, 2012 at 11:47 AM, Matt Mackall <mpm@...enic.com> wrote:
>
> I think you should demand a minimum number of events > HZ to actually
> credit any valid entropy.

There already is. It's 1.

If we don't get a single non-timer interrupt, this code will never be called.

And if we only get a single interrupt in over one HZ, then there very
arguably is one bit of entropy in 'jiffies' at the time of that
interrupt.

               Linus
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