Specifically, 64-bit systems need to be able to enforce 32-bit
addressing limits for device metadata like network cards' ring buffers
and SCSI command descriptors.
This is very distinct from 32-bit lowmem exhaustion issues; on 32-bit
the command descriptors and ring buffers are O(devices) and hence not
a lowmem pressure issue (well, the O(devices) bit could be but we might
as well say we don't support it and no one has asked for it to be
handled). Actual data having io done to it is unrelated to this.
-- wli
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