Andrew J.Schorr raises a question.  When he changes the disable setting on
a single CPU, it affects all the other CPUs.  Basically, currently, the
disable field is per-driver instead of per-cpu.  All the C states of the
same driver are shared by all CPU in the same machine.

The patch changes the `disable' field to per-cpu, so we could set this
separately for each cpu.
Signed-off-by: NShuoX Liu <shuox.liu@intel.com>
Reported-by: NAndrew J.Schorr <aschorr@telemetry-investments.com>
Reviewed-by: NYanmin Zhang <yanmin_zhang@intel.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NRafael J. Wysocki <rjw@sisk.pl>