Re: [RFC][PATCH] new timeofday arch specific timesources (v. A2)

[Christoph Lameter]

On Mon, 24 Jan 2005, john stultz wrote:

> +/* helper macro to atomically read both cyclone counter registers */
> +#define read_cyclone_counter(low,high) \
> +	do{ \
> +		high = cyclone_timer[1]; low = cyclone_timer[0]; \
> +	} while (high != cyclone_timer[1]);

This is only necessary on 32 bit platforms. On ia64 an atomic read would
do the job. Maybe that logic needs to go into the custom defined readq for
32 bit? Then you could avoid repeating the code for drivers that read 64
bit clocks on 32bit processors.
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