CPU core quantity info is not correct on RHEL5.7+ x64 (XEN) with 6-core CPU

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Issue

When booting the x64 Xen kernel on a RHEL5.7+ system with 6-core CPUs, the “cpu cores” field of /proc/cpuinfo always shows 1 on whatever the number of cores is detected on the system.

Environment

Red Hat Enterprise Linux 5.7
Red Hat Enterprise Linux 5.8
Red Hat Enterprise Linux 5.9
Xen

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