Why does a system leave "PCI: Using host bridge windows from ACPI; if necessary, use "pci=nocrs" and report a bug" message ?

Issue

• After update from Red Hat Enterprise Linux 6.2 to 6.3, seen below message :
• In RHEL 6.5, seen below message in dmesg file :

PCI: Using host bridge windows from ACPI; if necessary, use "pci=nocrs" and report a bug