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

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Message-ID: <CA+8MBbKZ7AT-5oMeLqO_n0UEsHfbTjWtDV40Z5gXrm_8RdY-Kw@mail.gmail.com>
Date:	Fri, 13 Apr 2012 09:07:01 -0700
From:	Tony Luck <tony.luck@...el.com>
To:	Émeric Maschino <emeric.maschino@...il.com>
Cc:	Paul Gortmaker <paul.gortmaker@...driver.com>,
	linux-ia64@...r.kernel.org, linux-kernel@...r.kernel.org,
	Fenghua Yu <fenghua.yu@...el.com>,
	David Howells <dhowells@...hat.com>,
	Michel Lespinasse <walken@...gle.com>
Subject: Re: [PATCH] ia64: populate the cmpxchg header with appropriate code

On Thu, Apr 12, 2012 at 2:52 PM, Tony Luck <tony.luck@...el.com> 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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