Re: [PATCH] ia64: populate the cmpxchg header with appropriate code

[Tony Luck <tony.luck@xxxxxxxxx>]

On Thu, Apr 12, 2012 at 2:52 PM, Tony Luck <tony.luck@xxxxxxxxx> wrote:
> IA64 doesn't return a -EFAULT when we poke at the supposedly invalid user
> address of "NULL" because we map a special page to catch prefetch references

Leaping to conclusions ... fail :-(

If I change the address from NULL to something that isn't mapped ... I
still don't
get -EFAULT.

Looking more closely at futex_atomic_cmpxchg_inatomic() for the
error case.

-Tony
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