netdev - Re: [patch 04/13] ppp_generic: fix lockdep warning

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Message-ID: <20070514072845.GA2081@ff.dom.local>
Date:	Mon, 14 May 2007 09:28:45 +0200
From:	Jarek Poplawski <jarkao2@...pl>
To:	David Miller <davem@...emloft.net>
Cc:	akpm@...ux-foundation.org, jeff@...zik.org, netdev@...r.kernel.org,
	jura@...ams.com, paulus@...ba.org
Subject: Re: [patch 04/13] ppp_generic: fix lockdep warning

On Sun, May 13, 2007 at 11:39:37PM -0700, David Miller wrote:
> From: Jarek Poplawski <jarkao2@...pl>
> Date: Mon, 14 May 2007 08:07:00 +0200
> 
> > After sending this patch I was a little confused, when next
> > lockdep warning report appeared, and I thought - since this is 
> > not enough, this patch could be dumped. But now I changed my
> > mind: there are really many possibilities of strange connections
> > between locks taken from vlans, ppp (with pppoe), multicasts etc.
> > - that every one possibility less is a gain here.
>  ...
> > Of course, later, if somebody will find better solution, they could
> > be removed,
> 
> I already suggested a better fix, you ignored it.

No, I couldn't have ignored any of your suggestions (I would've
written about any doubts, anyway). I simply misunderstood! I
thought you mean different classes for netdevs used in vlan,
and I prepared such a patch... Sorry!

> 
> For each unique netdev type, use a different locking class.
> 
> That will fix this forever, anything else is a situation specific
> band-aid (but then again isn't that what every lockdep annotation is
> :-).

Yes, this is very good idea, and I wonder, why you didn't try
this yourself (after my "ignore"). I thought a little about
this, but was afraid of it's wide range. Some things - like
in vlans - should be removed then, for this to work. I'll try
to send something like this soon (but I'm not so optimistic
it will cure all or forever...).

Regards,
Jarek P.
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