linux-kernel - Re: [PATCH RFC] Priority boosting for preemptible RCU

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Message-ID: <46CEAE41.7060001@shadowen.org>
Date:	Fri, 24 Aug 2007 11:09:05 +0100
From:	Andy Whitcroft <apw@...dowen.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	paulmck@...ux.vnet.ibm.com, linux-kernel@...r.kernel.org,
	linux-rt-users@...r.kernel.org, mingo@...e.hu, dipankar@...ibm.com,
	josht@...ux.vnet.ibm.com, tytso@...ibm.com, dvhltc@...ibm.com,
	tglx@...utronix.de
Subject: Re: [PATCH RFC] Priority boosting for preemptible RCU

Andrew Morton wrote:

>> +	for_each_possible_cpu(cpu) {
>> +		rbdp = per_cpu(rcu_boost_dat, cpu);
>> +		for (i = 0; i < RCU_BOOST_ELEMENTS; i++) {
>> +			rbdp[i].rbs_mutex = SPIN_LOCK_UNLOCKED;
> 
> Doesn't this confound lockdep?   We're supposed to use spin_lock_init().
> 
> Andy, can we have a checkpatch rule for SPIN_LOCK_UNLOCKED please?  It's
> basically always wrong.

ERROR: Use of SPIN_LOCK_UNLOCKED is deprecated: see
Documentation/spinlocks.txt
#58: FILE: Z17.c:55:
+       rbdp[i].rbs_mutex = SPIN_LOCK_UNLOCKED;

Also picks up the RW_LOCK_UNLOCKED version too.

-apw
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