From mboxrd@z Thu Jan  1 00:00:00 1970
From: Avi Kivity <avi@qumranet.com>
Subject: Re: [PATCH 01 of 12] Core of mmu notifiers
Date: Tue, 22 Apr 2008 18:24:20 +0300
Message-ID: <480E0324.6050006@qumranet.com>
References: <ea87c15371b1bd49380c.1208872277@duo.random> <480DFC8A.8040105@cosmosbay.com> <20080422151529.GE24536@duo.random>
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Cc: Eric Dumazet <dada1@cosmosbay.com>,
	Christoph Lameter <clameter@sgi.com>,
	Nick Piggin <npiggin@suse.de>, Jack Steiner <steiner@sgi.com>,
	Peter Zijlstra <a.p.zijlstra@chello.nl>,
	kvm-devel@lists.sourceforge.net,
	Kanoj Sarcar <kanojsarcar@yahoo.com>,
	Roland Dreier <rdreier@cisco.com>,
	Steve Wise <swise@opengridcomputing.com>,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org,
	Robin Holt <holt@sgi.com>, general@lists.openfabrics.org,
	Hugh Dickins <hugh@veritas.com>, akpm@linux-foundation.org,
	Rusty Russell <rusty@rustcorp.com.au>
To: Andrea Arcangeli <andrea@qumranet.com>
Return-path: <linux-kernel-owner+glk-linux-kernel-3=40m.gmane.org-S1765208AbYDVPYg@vger.kernel.org>
In-Reply-To: <20080422151529.GE24536@duo.random>
Sender: linux-kernel-owner@vger.kernel.org
List-Id: kvm.vger.kernel.org

Andrea Arcangeli wrote:
> On Tue, Apr 22, 2008 at 04:56:10PM +0200, Eric Dumazet wrote:
>  =20
>> Andrea Arcangeli a =E9crit :
>>    =20
>>> +
>>> +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 =3D=3D b)
>>> +		return 0;
>>> +	else
>>> +		return 1;
>>> +}
>>> +
>>>      =20
>> This compare function looks unusual...
>> It should work, but sort() could be faster if the
>> if (a =3D=3D b) test had a chance to be true eventually...
>>    =20
>
> Hmm, are you saying my mm_lock_cmp won't return 0 if a=3D=3Db?
>
>  =20

You need to compare *a to *b (at least, that's what you're doing for th=
e=20
< case).

--=20
error compiling committee.c: too many arguments to function