Re: [RFC] [PATCH] virtual memmap on sparsemem v3 [2/4] generic virtual mem_map on sparsemem

> +#ifdef CONFIG_SPARSEMEM_VMEMMAP
> +#if (((BITS_PER_LONG/4) * PAGES_PER_SECTION) % PAGE_SIZE) != 0
> +#error "PAGE_SIZE/SECTION_SIZE relationship is not suitable for vmem_map"
> +#endif

Why the BITS_PER_LONG/4? Or to put in other words: why not simply
PAGES_PER_SECTION % PAGE_SIZE != 0 ?
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