linux-kernel - Re: [patch 2/2] Sort module list by pointer address to get coherent sleepable seq

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Date:	Wed, 15 Aug 2007 05:18:45 +0100
From:	Al Viro <viro@....linux.org.uk>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	Randy Dunlap <rddunlap@...l.org>,
	Martin Bligh <mbligh@...gle.com>
Subject: Re: [patch 2/2] Sort module list by pointer address to get coherent sleepable seq_file iterators

On Wed, Aug 15, 2007 at 11:39:45AM +0800, Fengguang Wu wrote:
> On Sun, Aug 12, 2007 at 11:08:46AM -0400, Mathieu Desnoyers wrote:
> >  
> >  static void *m_next(struct seq_file *m, void *p, loff_t *pos)
> >  {
> > -	return seq_list_next(p, &modules, pos);
> > +	return seq_sorted_list_next(p, &modules, &m->private);
> >  }
> 
> In theory it is not safe to use something other than the passed in
> *pos as an position indicator. Because seq_file do not always call
> ->next() to advance to the next item. Look at seq_file.c, it sometimes
> increase the pos/index directly! Which also prevents pos to skip
> forward, which is preferred in your case.
> 
> The attached patch tries to fix it.
> 
> The seq_file.c is so twisted!
> 
> Fengguang
> ===
> 
> seqfile: remove seq_file's assumption about iterators
> 
> The seq_file implementation has some hardcoded index++/pos++ lines,
> which assumes iterators to be *continuous* integers.

What the fuck?  It assumes no such thing and a lot of iterators are
nothing like integers.  What are you talking about?
-
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