On Thu, 28 Jun 2012, Gavin Shan wrote:

With CONFIG_SPARSEMEM_EXTREME, the two level of memory section
descriptors are allocated from slab or bootmem. When allocating
from slab, let slab/bootmem allocator to clear the memory chunk.
We needn't clear that explicitly.

Signed-off-by: Gavin Shan <redacted>
Reviewed-by: Michal Hocko <redacted>

Acked-by: David Rientjes <rientjes@google.com>

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