linux-kernel - Re: PI mutex support on ARM

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Message-Id: <1183992366.2668.0.camel@laptopd505.fenrus.org>
Date:	Mon, 09 Jul 2007 07:46:06 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	linux@...mer.net
Cc:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org, linux-rt-users@...r.kernel.org
Subject: Re: PI mutex support on ARM

On Sun, 2007-07-08 at 22:17 +0200, Remy Bohmer wrote:
> 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?

if get_user() isn't allowed with irq's off (and in general it's not,
maybe arm is special) then it also isn't allowed with spinlocks held..



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