[RFC PATCH] Expand memblock=debug to provide a bit more details (v1).

[Konrad Rzeszutek Wilk]

While trying to track down some memory allocation issues, I realized that
memblock=debug was giving some information, but for guests with 256GB or
so the majority of it was just:

 memblock_reserve: [0x00003efeeea000-0x00003efeeeb000] __alloc_memory_core_early+0x5c/0x64

which really didn't tell me that much. With these patches I know it is:

 memblock_reserve: [0x00003ffe724000-0x00003ffe725000] (4kB) vmemmap_pmd_populate+0x4b/0xa2

.. which isn't really that useful for the problem I was tracking down, but
it does help in figuring out which routines are using memblock.

Please see the patches - not sure what is in the future for memblock.c
so if they are running afoul of some future grand plans - I can rebase them.

Thanks!
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