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Subject"mm: use early_pfn_to_nid in page_ext_init" broken on some configurations?
fe53ca54270a ("mm: use early_pfn_to_nid in page_ext_init") seem
to silently depend on CONFIG_HAVE_ARCH_EARLY_PFN_TO_NID resp.
CONFIG_HAVE_MEMBLOCK_NODE_MAP. early_pfn_to_nid is returning zero with
I am not sure how widely is this used but such a code is tricky. I see
how catching early allocations during defered initialization might be
useful but a subtly broken code sounds like a problem to me. So is
fe53ca54270a worth this or we should revert it?
Michal Hocko

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