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    SubjectRe: [RFC] [PATCH] virtual memmap on sparsemem v3 [0/4] introduction
    > Virtual mem_map is not useful for 32bit archs. This uses huge virtual
    > address range.

    Why? The s390 vmem_map implementation which I sent last week to linux-mm
    is merged in the meantime. It supports both 32 and 64 bit.
    The main reason is to keep things simple and avoid #ifdef hell.

    Since the maximum size of the virtual array is about 16MB it's not much
    waste of address space. Actually I just changed the size of the vmalloc
    area, so that the maximum supported physical amount of memory is still 1920MB.
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