Re: [PATCH 1/4] Add clock_gettime_ns syscall

[Arun Sharma]

On 12/25/11 8:51 AM, Andy Lutomirski wrote:

> +struct timens {
> +	u64	ns;		/* nanoseconds since the relevant epoch */
> +	u64	padding;	/* for future expansion (UTC offset? sub-ns?) */
> +};
> ..
> +SYSCALL_DEFINE2(clock_gettime_ns, const clockid_t, which_clock,
> +		struct timens __user *, tp)
> +{

How about returning a (signed) long as the time in ns? This way, we save 
a store and a load and the value can be passed in registers.

This shouldn't preclude future expansion via extra args.

 -Arun
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