Deferred struct page initialization issue vs memblocks

[Mika PenttilÃ]

deferred_init_memmap() uses for_each_mem_pfn_range() which (in x86)
uses memblocks. Because of CONFIG_ARCH_DISCARD_MEMBLOCK, the memblock
infos have already been freed to page allocator (in
free_low_memory_core_early()), which happens before
deferred_init_memmap().

Maybe the fix is not to allow DISCARD_MEMBLOCK in deferred case, or
discard memblock infos later.

Thanks,

Mika
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