On Wed, 6 May 2015, John Stultz wrote:
> It was noted that the 32bit implementation of ktime_divns()
> was doing unsigned division and didn't properly handle
> negative values.
>
> This patch fixes the problem by checking and preserving
> the sign bit, and then reapplying it if appropriate after
> the division, it also changes the return type to a s64
> to make it more obvious this is expected.
>
[...]
>
> -# define ktime_divns(kt, div) (u64)((kt).tv64 / (div))
> +static inline s64 ktime_divns(const ktime_t kt, s64 div)
> +{
> + /*
> + * 32-bit implementation cannot handle negative divisors,
> + * so catch them on 64bit as well.
> + */
> + BUG_ON(div < 0);
> + return (u64)((kt).tv64 / (div))
You forgot to remove the u64 cast?
Is there a reason why it was there originally?
Nicolas
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