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SubjectRe: [PATCH v4 3/4] mm/sparse: Add a new parameter 'data_unit_size' for alloc_usemap_and_memmap
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On 05/21/2018 03:15 AM, Baoquan He wrote:
> It's used to pass the size of map data unit into alloc_usemap_and_memmap,
> and is preparation for next patch.

This is the "what", but not the "why". Could you add another sentence
or two to explain why we need this?

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