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    SubjectRe: [PATCH 07/10] bootmem: add free_bootmem_late
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    On Mon, Nov 9, 2009 at 10:13 PM, Pekka Enberg <penberg@cs.helsinki.fi> wrote:
    >>        for (cursor = start; cursor < end; cursor += BITS_PER_LONG) {
    >> -               unsigned long idx, vec;
    >> +               unsigned long vec;
    >>
    >> -               idx = cursor - start;
    >> -               vec = ~map[idx / BITS_PER_LONG];
    >> +               if (map) {
    >> +                       unsigned long idx = cursor - start;
    >> +                       vec = ~map[idx / BITS_PER_LONG];
    >> +               } else {
    >> +                       if (end - cursor >= BITS_PER_LONG)
    >> +                               vec = ~0UL;
    >
    > Why do we need the above?

    OK, I figured that out. I'm not sure why you want to play tricks with
    "vec" when you could just add a new helper that calls
    __free_pages_bootmem() for the full contiguous page range.

    Pekka
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