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SubjectRe: [PATCH] Alternate futex non-page-pinning and COW fix

On Thu, 4 Sep 2003, Jamie Lokier wrote:
>
> * A futex on a MAP_PRIVATE must be mm-local: the canonical
> * example being MAP_PRIVATE of /dev/zero.

Actually, /dev/zero is a special case in itself. It is an anonymous
mapping, and is equivalent to MAP_ANON for private mappings. For
MAP_SHARED it is something _totally_ different.

So /dev/zero isn't even an interesting case.

> Unfortunately I think the above 5 conditions do not have a consistent
> solution. Please prove me wrong :)

I don't think there is any inconsistency.

Linus

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