linux-kernel - spin_is_locked() broken for uniprocessor?

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Date:	Tue, 18 Aug 2009 17:09:56 -0500
From:	Kumar Gala <galak@...nel.crashing.org>
To:	Linux-Kernel List <linux-kernel@...r.kernel.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	linuxppc-dev list <linuxppc-dev@...abs.org>
Subject: spin_is_locked() broken for uniprocessor?

I just want to validate that what I'm seeing (for UP, non-debug  
features):

spin_is_locked() is defined as:

include/linux/spinlock.h:#define spin_is_locked(lock)    
__raw_spin_is_locked(&(lock)->raw_lock)

for UP that should get us:

include/linux/spinlock_up.h:#define __raw_spin_is_locked(lock)  ((void) 
(lock), 0)

which implies to me that spin_is_locked() will always return false.   
Is this expected behavior.

- k
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