Messages in this thread | | | Subject | Re: [PATCH] prevent NULL mmap in topdown model | From | Greg Stark <> | Date | 29 May 2005 17:16:33 -0400 |
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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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