While investigating a possible compiler bug on the s390 affecting  
__stp_estimate_cpufreq(),  I came to the conclusion that this function 
made little sense on the s390.  Both get_cycles() and udelay() use the 
TOD clock.  On the s390 the TOD is always at a known frequency on all 
models.   The following patch to _stp_gettimeofday_ns() simply converts 
get_cycles()'s return value into nanoseconds and it has the side effect 
of avoiding the gcc bug :)

The per-cpu timer values are also not needed on the s390 as all cpus use 
the same TOD clock.  However, I did not remove this code for ease of 
maintenance.
-- 

David Wilder
IBM Linux Technology Center
Beaverton, Oregon, USA 
dwilder@us.ibm.com
(503)578-3789