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    SubjectRe: [RFC] [PATCH] virtual memmap on sparsemem v3 [2/4] generic virtual mem_map on sparsemem
    On Sat, 9 Dec 2006 13:05:47 +0100
    Heiko Carstens <heiko.carstens@de.ibm.com> wrote:

    > > +#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 ?
    >
    sorry, my mistake. What I wanted to do was

    32bits arch --
    4 * PAGES_PER_SECTION % PAGE_SIZE
    64bits arch --
    8 * PAGES_PER_SECTION % PAGE_SIZE

    I'll renew this in the next week.

    -Kame

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