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From: Kumar Gala <galak@kernel.crashing.org>
To: Linux-Kernel List <linux-kernel@vger.kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>,
	Benjamin Herrenschmidt <benh@kernel.crashing.org>,
	linuxppc-dev list <linuxppc-dev@ozlabs.org>
Subject: spin_is_locked() broken for uniprocessor?
Date: Tue, 18 Aug 2009 17:09:56 -0500	[thread overview]
Message-ID: <DE9C9034-D2CE-4D21-93D9-A10FE2580920@kernel.crashing.org> (raw)

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

             reply	other threads:[~2009-08-18 22:10 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-08-18 22:09 Kumar Gala [this message]
2009-08-18 22:24 ` Thomas Gleixner
2009-08-19  9:38 ` David Howells
2009-08-19  9:41   ` Peter Zijlstra
2009-08-27  9:32     ` Benjamin Herrenschmidt
2009-08-19 10:53   ` Alan Cox
2009-08-19 11:16     ` Leon Woestenberg
2009-08-19 11:23       ` Peter Zijlstra

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