linux-kernel - Re: CONFIG_PROVE_RCU breaks proprietary modules (rcu_lock

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Message-ID: <4BB0E937.7070200@imap.cc>
Date:	Mon, 29 Mar 2010 19:53:59 +0200
From:	Tilman Schmidt <tilman@...p.cc>
To:	paulmck@...ux.vnet.ibm.com
CC:	linux-kernel@...r.kernel.org
Subject: Re: CONFIG_PROVE_RCU breaks proprietary modules (rcu_lock_map)

Am 29.03.2010 17:09 schrieb Paul E. McKenney:
> On Sun, Mar 21, 2010 at 10:04:42PM +0100, Tilman Schmidt wrote:
[...]
>> So if building a proprietary module fails with the message:
>>
>> FATAL: modpost: GPL-incompatible module <module> uses GPL-only symbol
>> 'rcu_lock_map'
>>
>> try rebuilding your kernel with the PROVE_RCU option disabled.
>>
>> Hope it helps someone.
> 
> I am comfortable with PROVE_RCU being incompatible with non-GPL modules.
> After all, it is only a debugging option, not intended for production use.

I agree completely. I just wanted to publish that fact because it seems
to be little known and can be quite a puzzler.

Thanks,
Tilman

-- 
Tilman Schmidt                    E-Mail: tilman@...p.cc
Bonn, Germany
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