linux-kernel - Re: sparse errors in srcu.h

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Message-ID: <4577DE46.5000603@ens-lyon.org>
Date:	Thu, 07 Dec 2006 10:26:30 +0100
From:	Brice Goglin <Brice.Goglin@...-lyon.org>
To:	paulmck@...ux.vnet.ibm.com
CC:	"Paul E. McKenney" <paulmck@...ibm.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: sparse errors in srcu.h

Paul E. McKenney wrote:
> On Wed, Dec 06, 2006 at 10:50:14AM +0100, Brice Goglin wrote:
>   
>> Hi,
>>
>> When running sparse checks on a file that ends up including srcu.h, we
>> get the following warnings:
>>
>>     include/linux/srcu.h:52:44: error: undefined identifier 'sp'
>>     include/linux/srcu.h:52:44: error: bad constant expression
>>     include/linux/srcu.h:53:56: error: undefined identifier 'sp'
>>     include/linux/srcu.h:53:56: error: bad constant expression
>>
>> It seems to be caused by the following lines:
>>
>>     int srcu_read_lock(struct srcu_struct *sp) __acquires(sp);
>>     void srcu_read_unlock(struct srcu_struct *sp, int idx) __releases(sp);
>>
>> which come from the following commit.
>>
>>     commit 621934ee7ed5b073c7fd638b347e632c53572761
>>     Author: Paul E. McKenney <paulmck@...ibm.com>
>>     Date:   Wed Oct 4 02:17:02 2006 -0700
>>
>>     [PATCH] srcu-3: RCU variant permitting read-side blocking
>>
>>
>> I was wondering if there is a way to fix those errors...
>>     
>
> I believe that you need to update your version of sparse to 0.1.
> See http://lwn.net/Articles/208312/ for more info.
>
> 							Thanx, Paul
>   

Right, thanks, I had an old version hidden in /usr/local, works fine now.

Brice

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