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    SubjectRe: Intel P6 vs P7 system call performance
    On Tue, Dec 17, 2002 at 09:07:21AM -0800, Linus Torvalds wrote:
    > On Tue, 17 Dec 2002, Hugh Dickins wrote:
    > > I thought that last page was intentionally left invalid?
    >
    > It was. But I thought it made sense to use, as it's the only really
    > "special" page.

    In couple of occasions I have caught myself from pre-decrementing
    a char pointer which "just happened" to be NULL.

    Please keep the last page, as well as a few of the first pages as
    NULL-pointer poisons.

    > But yes, we should decide on this quickly - it's easy to change right now,
    > but..
    >
    > Linus

    /Matti Aarnio
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