Read all_cpus variable out of kmem, and validate CPUs against the all_cpus cpu mask before looking at the cache entries for the CPU.  For systems with sparse CPU id arrays, this skips otherwise uninitialized cache structures.
Read all_cpus variable out of kmem, and validate CPUs against the all_cpus
cpu mask before looking at the cache entries for the CPU.  For systems
with sparse CPU id arrays, this skips otherwise uninitialized cache
structures.

MFC after:	3 days

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