On Fri, May 1, 2015 at 11:29 AM, Nicolas Pitre wrote:
> On Fri, 1 May 2015, John Stultz wrote:
>
>> So yea. I see the issue now. The ktime_divns() function uses do_div
>> which is an unsigned divide. So negative numbers look like large
>> numbers, and it doesn't do sign-extension, so when it divid
On Fri, 1 May 2015, John Stultz wrote:
> So yea. I see the issue now. The ktime_divns() function uses do_div
> which is an unsigned divide. So negative numbers look like large
> numbers, and it doesn't do sign-extension, so when it divides we lose
> the sign bit.
That doesn't stop there. On 32-bi
On Fri, May 1, 2015 at 3:02 AM, Trevor Cordes wrote:
> May 1 04:46:12 piles kernel: [ 356.838029] JDB: ktime_to_us: -20157485 ->
> divns 18446744073689394 != old method: -20158
>
> The last 2-3 or 3 groups of output I could produce on demand by stopping
> mythbackend and running:
> systemctl r
On 2015-04-30 John Stultz wrote:
> >From your description it does seem like some sort of edge case
> >problem
> w/ the 32bit ktime_divns(), but I don't see it right off, and I agree
> with Alan to do both calculations and print out warn when that
> happens.
>
> There's also not a ton of users of t
On Wed, Apr 29, 2015 at 9:27 PM, Trevor Cordes wrote:
> Sorry for the top-posting; Josh Boyer suggested I re-mail this mail
> from last month which didn't get any replies. I'm still having this
> weird kernel bug affecting me and I've bisected it down to like 2-4
> lines of code. (I've thought m
> > Obviously my patch isn't the real solution, the real solution is to
> > make the new function calls use a consistent 64-bit type, or figure
> > out what in my code path is calling these functions and check it for
> > value sanity.
I would be tempted to do both computations and print then input
Sorry for the top-posting; Josh Boyer suggested I re-mail this mail
from last month which didn't get any replies. I'm still having this
weird kernel bug affecting me and I've bisected it down to like 2-4
lines of code. (I've thought more about my theory regarding
unsigned/signed below and it's pr
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