The core cpufreq code doesn't appear to understand returning -EAGAIN
for the get() function of the cpufreq_driver. If PAL_GET_PSTATE returns
-1, such as when running on Xen, scaling_cur_freq is happy to return
4294967285 kHz (ie. (unsigned)-11). The other drivers appear to return
0 for a failure, and doing so gives me the max frequency from
scaling_cur_frequency and "<unknown>" from cpuinfo_cur_frequency. I
believe that's the desired behavior.
Signed-off-by: Alex Williamson <alex.williamson@hp.com>
Acked-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
saved_mask = current->cpus_allowed;
set_cpus_allowed(current, cpumask_of_cpu(cpu));
- if (smp_processor_id() != cpu) {
- ret = -EAGAIN;
+ if (smp_processor_id() != cpu)
goto migrate_end;
- }
/* processor_get_pstate gets the instantaneous frequency */
ret = processor_get_pstate(&value);
set_cpus_allowed(current, saved_mask);
printk(KERN_WARNING "get performance failed with error %d\n",
ret);
- ret = -EAGAIN;
+ ret = 0;
goto migrate_end;
}
clock_freq = extract_clock(data, value, cpu);