From mboxrd@z Thu Jan  1 00:00:00 1970
From: Davidlohr Bueso <dave-h16yJtLeMjHk1uMJSBkQmQ@public.gmane.org>
Subject: Re: Revised futex(2) man page for review
Date: Tue, 31 Mar 2015 07:45:46 -0700
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To: Peter Zijlstra <peterz-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
Cc: "Michael Kerrisk (man-pages)" <mtk.manpages-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>, Thomas Gleixner <tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org>, Darren Hart <dvhart-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>, Carlos O'Donell <carlos-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>, Ingo Molnar <mingo-X9Un+BFzKDI@public.gmane.org>, Jakub Jelinek <jakub-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>, "linux-man-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" <linux-man-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>, lkml <linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>, Arnd Bergmann <arnd-r2nGTMty4D4@public.gmane.org>, Steven Rostedt <rostedt-nx8X9YLhiw1AfugRpC6u6w@public.gmane.org>, Linux API <linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>, Torvald Riegel <triegel-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>, Roland McGrath <roland-/Z5OmTQCD9xF6kxbq+BtvQ@public.gmane.org>, Darren Hart <dvhart-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>, Anton Blanchard <anton-eUNUBHrolfbYtjvyW6yDsg@public.gmane.org>, Eric Dumazet <edumazet-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>, bill o gallmeister <bgallmeister-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>, Jan Kiszka <jan.kiszka-kv7WeFo6aLtBDgjK7y7TUQ@public.gmane.org>, Daniel Wagner <wagi-kQCPcA+X3s7YtjvyW6yDsg@public.gmane.org>, Rich Felker <dalias-8zAoT0mYgF4@public.gmane.org>, Andy Lutomirski <luto-kltTT9wpgjJwATOyAt5JVQ@public.gmane.org>, bert hubert <bert.hubert-dxZxOz86jR8sYtaaK7K+xw@public.gmane.org>, Rusty Russell <rusty-8n+1lVoiYb8U04JRNCRQjg@public.gmane.org>
List-Id: linux-api@vger.kernel.org

On Sat, 2015-03-28 at 12:47 +0100, Peter Zijlstra wrote:

>        The condition is represented by the futex word, which is an ad=
dress  in
>        memory  supplied to the futex() system call, and the value at =
this mem=E2=80=90
>        ory location.  (While the virtual addresses for the same memor=
y in sep=E2=80=90
>        arate  processes  may  not be equal, the kernel maps them inte=
rnally so
>        that the same memory mapped in different locations will corres=
pond  for
>        futex() calls.)
>=20
>        When  executing  a futex operation that requests to block a th=
read, the
>        kernel will only block if the futex word has the value that th=
e calling

Given the use of "word", you should probably state right away that
futexes are only 32bit.

Thanks,
Davidlohr