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Message-ID: <a36005b50602210838wa87764eof7b5d6e5a8a5ab3a@mail.gmail.com>
Date: Tue, 21 Feb 2006 08:38:04 -0800
From: "Ulrich Drepper" <drepper@gmail.com>
To: "Chuck Ebbert" <76306.1226@compuserve.com>
Subject: Re: [patch 5/6] lightweight robust futexes: i386
Cc: "Ingo Molnar" <mingo@elte.hu>, "Thomas Gleixner" <tglx@linutronix.de>,
       "Andrew Morton" <akpm@osdl.org>,
       "Arjan van de Ven" <arjan@infradead.org>,
       "Ulrich Drepper" <drepper@redhat.com>,
       linux-kernel <linux-kernel@vger.kernel.org>
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On 2/21/06, Chuck Ebbert <76306.1226@compuserve.com> wrote:
> > +             : "=a" (oldval), "=m" (*uaddr)
>                                  ^^^^
>    Should be "+m" because it's both read and written.

No, this is why there is the "0" input parameter.


\> > +             : "memory"
>                   ^^^^^^^^
>    Is this necessary? Every possible memory location that could be
> affected has been listed in the operands if the above change is made.

This makes the asm a barrier for the compiler.
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