"mm, memcg: sync allocation and memcg charge gfp flags for THP" in -mm
introduces a formal to pass the gfp mask for khugepaged's hugepage
allocation. This is just too ugly to live.
alloc_hugepage_gfpmask() cannot differ between NUMA and UMA configs by
anything in GFP_RECLAIM_MASK, which is the only thing that matters for
memcg reclaim, so just determine the gfp flags once in
collapse_huge_page() and avoid the complexity.
Signed-off-by: David Rientjes <rientjes@xxxxxxxxxx>