NUMA: optimize detection of memory with no node id assigned by firmware

Sanity check that makes sure the nodes cover all memory loops over
numa_meminfo to count the pages that have node id assigned by the
firmware, then loops again over memblock.memory to find the total amount
of memory and in the end checks that the difference between the total
memory and memory that covered by nodes is less than some threshold. 
Worse, the loop over numa_meminfo calls __absent_pages_in_range() that
also partially traverses memblock.memory.

It's much simpler and more efficient to have a single traversal of
memblock.memory that verifies that amount of memory not covered by nodes
is less than a threshold.

Introduce memblock_validate_numa_coverage() that does exactly that and use
it instead of numa_meminfo_cover_memory().

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Liam Ni <[email protected]>
Reviewed-by: Mike Rapoport (IBM) <[email protected]>
Cc: Andy Lutomirski <[email protected]>
Cc: Bibo Mao <[email protected]>
Cc: Binbin Zhou <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: Dave Hansen <[email protected]>
Cc: Feiyang Chen <[email protected]>
Cc: "H. Peter Anvin" <[email protected]>
Cc: Huacai Chen <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: WANG Xuerui <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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