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

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Message-ID: <7099.1250674686@redhat.com>
Date:	Wed, 19 Aug 2009 10:38:06 +0100
From:	David Howells <dhowells@...hat.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	dhowells@...hat.com, Kumar Gala <galak@...nel.crashing.org>,
	Peter Zijlstra <peterz@...radead.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?

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.

David
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