linux-kernel - Re: spin_is_locked() broken for uniprocessor?

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Message-Id: <1250674870.7583.334.camel@twins>
Date:	Wed, 19 Aug 2009 11:41:10 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	David Howells <dhowells@...hat.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Kumar Gala <galak@...nel.crashing.org>,
	Linux-Kernel List <linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	linuxppc-dev list <linuxppc-dev@...abs.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: spin_is_locked() broken for uniprocessor?

On Wed, 2009-08-19 at 10:38 +0100, David Howells wrote:
> Thomas Gleixner <tglx@...utronix.de> wrote:
> 
> > > which implies to me that spin_is_locked() will always return false.  Is this
> > > expected behavior.
> > 
> > That's wrong. spin_is_locked should always return true on UP.
> 
> Surely it's not that simple?  Maybe spin_is_lock() should be undefined on UP.

#define spin_is_locked(l) panic()

should sort things out quickly ;-)
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