> +/*
> + * timespec_diff_ns - Return difference of two timestamps in nanoseconds
> + * In the rare case of @end being earlier than @start, return zero
> + */
> +static inline nsec_t timespec_diff_ns(struct timespec *start, struct timespec *end)
> +{
> + nsec_t ret;
> +
> + ret = (nsec_t)(end->tv_sec - start->tv_sec)*NSEC_PER_SEC;
> + ret += (nsec_t)(end->tv_nsec - start->tv_nsec);
> + if (ret < 0)
> + return 0;
> + return ret;
> +}
> #endif /* __KERNEL__ */
>
wouldn't it be more useful to have this return a timespec as well, and
then it'd be generically useful (and it also probably should then be
uninlined ;)
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