From: Linas Vepstas <linas@austin.ibm.com>

This patch fixes multiple EEH-related bugs:

 - Fixes the eeh_check_failure() usage in an interrupt context.
   This routine is now safe to use in an interrupt. The fix was to
   build a cache of IO addresses and check that, instead of using
   the pci routines.
 - Merges in Olof Johansson's sizeof patch when checking for failure
 - Adds EEH tests to array/string reads
 - Fixes bugs with address resolution (some i/o addresses were handled
   incorrectly, resulting in EEH errors slipping by undetected.)
 - Adds EEH support to the PCI Hotplug system (so that devices that
   get added/removed get properly registered with the EEH subsystem.)
 - Fixes improper use of /proc filesystem.
 - Adds some misc statistics.

While merging Linas' patch I also converted the proc usage to
seq_single, used per cpu variables for the stats and removed the
eeh-force-off option.