Messages in this thread | | | Date | Fri, 6 Jul 2012 12:52:57 -0400 | From | Theodore Ts'o <> | Subject | Re: [PATCH 01/10] random: make 'add_interrupt_randomness()' do something sane |
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On Fri, Jul 06, 2012 at 09:24:00AM -0700, Linus Torvalds wrote: > On Fri, Jul 6, 2012 at 6:01 AM, Theodore Ts'o <tytso@mit.edu> wrote: > > What in the world is "fast count"? I've grepped for it, > > and I can't find it. > > It's your own fast-pool counter that Matt was talking about.
When he said "check it against HZ", it confused me, since there's no way to compare it against HZ. But yes, I can certainly not give any credit for entropy if __IRQF_TIMER is set, or keep track of whether the previous interrupt had __IRQF_TIMER set in its descriptor. That's simple enough.
I thought he was saying there was some way to distinguish between interrupts triggered by the clock interrupt versus other devices on the same irq channel --- and I couldn't figure out any to do that in an architecture independent way.
- Ted
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