linux-kernel - Re: [PATCH] lockdep: annotate nfs/nfsd in-kernel sockets

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Message-ID: <17706.1827.174148.860144@cse.unsw.edu.au>
Date:	Mon, 9 Oct 2006 18:24:03 +1000
From:	Neil Brown <neilb@...e.de>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...l.org>, steved@...hat.com,
	Ingo Molnar <mingo@...e.hu>,
	Trond Myklebust <trond.myklebust@....uio.no>
Subject: Re: [PATCH] lockdep: annotate nfs/nfsd in-kernel sockets

On Monday October 9, a.p.zijlstra@...llo.nl wrote:
> On Mon, 2006-10-09 at 11:00 +1000, Neil Brown wrote:
> > On Friday October 6, a.p.zijlstra@...llo.nl wrote:
> > > 
> > > Stick NFS sockets in their own class to avoid some lockdep warnings.
> > > NFS sockets are never exposed to user-space, and will hence not trigger
> > > certain code paths that would otherwise pose deadlock scenarios.
> > 
> > I'm a bit bothered that the changelog entry does mention what sort of
> > lockdep warning are begin avoided, 
> 
> These:
>   http://lkml.org/lkml/2006/7/13/84

Wouldn't have hurt to have that link in the changelog... or maybe an
excerpt?

That is very much an nfs-client issue, so reclassifying the
server-side sockets seems irrelevant.  Doesn't cause any harm though I
suppose.

> 
> > and that 'svc_reclassify_socket'
> > doesn't contain the work 'lock', yet is it really the locks that are
> > being reclassified.
> 
> Hmm, good point, shall I do s/reclassify_socket/reclassify_sock_lock/ ?
> 

If you want to keep that function, then yes.

Thanks,
NeilBrown
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