From: "Remy Bohmer" <l.pinguin@gmail.com>
To: "Ingo Molnar" <mingo@elte.hu>
Cc: "Thomas Gleixner" <tglx@linutronix.de>,
linux-kernel@vger.kernel.org, linux-rt-users@vger.kernel.org
Subject: Re: PI mutex support on ARM
Date: Sun, 8 Jul 2007 22:17:40 +0200 [thread overview]
Message-ID: <3efb10970707081317k22de079dr9a5cad6a42cf5b3b@mail.gmail.com> (raw)
In-Reply-To: <20070708095841.GA4601@elte.hu>
Hello Ingo,
> patch format problem: never diff the asm/ files, diff the asm-arm/ files.
Yeah, of course, I know, I believe I made a real mess of this one ...
> is it safe to do a get_user() with irqs off?
rhetorical question ;-))
I was wondering, Is it safe to use a normal spinlock here, like this?
------- 8-< -------------
spin_lock(&futex_lock);
err = get_user(uval, uaddr);
if ((!err) && (uval == oldval))
err = put_user(newval, uaddr);
spin_unlock(&futex_lock);
------- 8-< -------------
> is this method of atomic ops SMP-safe?
another rhetorical question ;-))
Nope, I already knew that, that why I mentioned that it probably only
worked on UP...
Remy
next prev parent reply other threads:[~2007-07-08 20:17 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-07-08 8:24 Remy Bohmer
2007-07-08 9:58 ` Ingo Molnar
2007-07-08 20:17 ` Remy Bohmer [this message]
2007-07-09 14:46 ` Arjan van de Ven
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