Re: [PATCH] futex: Fix ZERO_PAGE cause infinite loop

[Ulrich Drepper]

On Thu, Dec 24, 2009 at 01:39, Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:
> What I mean is, all (?) futex ops assume userspace actually wrote
> something to the address in question to begin with, therefore it can
> never be the zero page.

In practice today this is likely always the case.  But it doesn't have
to be like that.  In theory a zero-initialized futex is a reasonable
object on which to wait.  You should not preclude this from happening
just because it's not done like this today.
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