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    SubjectRe: [PATCH] prevent NULL mmap in topdown model
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    Arjan van de Ven <arjan@infradead.org> writes:

    > On Wed, 2005-05-18 at 23:46 -0700, Chris Wright wrote:
    >
    > sure. Making it *impossible* to mmap that page is bad. People should be
    > able to do that if they really want to, just doing it if they don't ask
    > for it is bad.
    >
    > There are plenty of reasons people may want that page mmaped, one of
    > them being that the compiler can then do more speculative loads around
    > null pointer checks. Not saying it's a brilliant idea always, but making
    > such things impossible makes no sense.

    More realistically, iirc either Wine or dosemu, i forget which, actually has
    to map page 0 to work properly.

    --
    greg

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