Add a vm.blacklist tunable which can hold a space or comma seperated list

of physical addresses.  The pages containing these physical addresses will
not be added to the free list and thus will effectively be ignored by the
VM system.  This is mostly useful for the case when one knows of specific
physical addresses that have bit errors (such as from a memtest run) so
that one can blacklist the bad pages while waiting for the new sticks of
RAM to arrive.  The physical addresses of any ignored pages are listed in
the message buffer as well.

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