linux-kernel - Re: [PATCH 01 of 12] Core of mmu notifiers

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Message-ID: <480E0324.6050006@qumranet.com>
Date:	Tue, 22 Apr 2008 18:24:20 +0300
From:	Avi Kivity <avi@...ranet.com>
To:	Andrea Arcangeli <andrea@...ranet.com>
CC:	Eric Dumazet <dada1@...mosbay.com>,
	Christoph Lameter <clameter@....com>,
	Nick Piggin <npiggin@...e.de>, Jack Steiner <steiner@....com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	kvm-devel@...ts.sourceforge.net,
	Kanoj Sarcar <kanojsarcar@...oo.com>,
	Roland Dreier <rdreier@...co.com>,
	Steve Wise <swise@...ngridcomputing.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Robin Holt <holt@....com>, general@...ts.openfabrics.org,
	Hugh Dickins <hugh@...itas.com>, akpm@...ux-foundation.org,
	Rusty Russell <rusty@...tcorp.com.au>
Subject: Re: [PATCH 01 of 12] Core of mmu notifiers

Andrea Arcangeli wrote:
> On Tue, Apr 22, 2008 at 04:56:10PM +0200, Eric Dumazet wrote:
>   
>> Andrea Arcangeli a écrit :
>>     
>>> +
>>> +static int mm_lock_cmp(const void *a, const void *b)
>>> +{
>>> +	cond_resched();
>>> +	if ((unsigned long)*(spinlock_t **)a <
>>> +	    (unsigned long)*(spinlock_t **)b)
>>> +		return -1;
>>> +	else if (a == b)
>>> +		return 0;
>>> +	else
>>> +		return 1;
>>> +}
>>> +
>>>       
>> This compare function looks unusual...
>> It should work, but sort() could be faster if the
>> if (a == b) test had a chance to be true eventually...
>>     
>
> Hmm, are you saying my mm_lock_cmp won't return 0 if a==b?
>
>   

You need to compare *a to *b (at least, that's what you're doing for the 
< case).

-- 
error compiling committee.c: too many arguments to function

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