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"Transparent hugepages can only be created if rmap is fully functional.
A specially crafted binary could allow the user stack to grow huge and
backed by hugepages without this patch while is_vma_temporary_stack() is
This also optmizes away some harmless but unnecessary setting of
khugepaged_scan.address and it switches some BUG_ON to VM_BUG_ON."
mm/huge_memory.c - introduced in 71e3aac0 (v2.6.38-rc1)