Re: [Patch 1/9] timestamp diff

> +static inline void timespec_diff(struct timespec *start, struct timespec *end,
> +				 struct timespec *ret)
> +{
> +	ret->tv_sec = end->tv_sec - start->tv_sec;
> +	ret->tv_nsec = end->tv_nsec - start->tv_nsec;
> +}
>  #endif /* __KERNEL__ */

I'd suggest normalizing the timespec; better to do it in such a function
than in all callers of it..


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