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Prevent userspace applications from allocating low memory address ranges. Otherwise, if some application happens to allocate such a range and intends for a remote node to access it, and if that node also implements SBP-2 (which will become more likely with the upcoming SBP-2 target support), these accesses would be routed by the physical DMA unit to some wrong memory address. Signed-off-by: Clemens Ladisch <clemens@ladisch.de> Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>