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-bit systems, if the divisor is not constant or too large, then __ktime_divns() is used. If you look at the code for __ktime_divns(), you'll notice it would get into an infinite loop if you pass it a negative divisor. Nicolas -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
