linux-kernel - Re: [PATCH v3 01/17] hashtable: introduce a small and naive hashtable

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Message-ID: <1346951742.1680.38.camel@gandalf.local.home>
Date:	Thu, 06 Sep 2012 13:15:42 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Sasha Levin <levinsasha928@...il.com>
Cc:	Josh Triplett <josh@...htriplett.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Pedro Alves <palves@...hat.com>, Tejun Heo <tj@...nel.org>,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	paul.gortmaker@...driver.com, davem@...emloft.net, mingo@...e.hu,
	ebiederm@...ssion.com, aarcange@...hat.com, ericvh@...il.com,
	netdev@...r.kernel.org, eric.dumazet@...il.com, axboe@...nel.dk,
	agk@...hat.com, dm-devel@...hat.com, neilb@...e.de,
	ccaulfie@...hat.com, teigland@...hat.com,
	Trond.Myklebust@...app.com, bfields@...ldses.org,
	fweisbec@...il.com, jesse@...ira.com,
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	dev@...nvswitch.org, rds-devel@....oracle.com, lw@...fujitsu.com
Subject: Re: [PATCH v3 01/17] hashtable: introduce a small and naive
 hashtable

On Thu, 2012-09-06 at 18:21 +0200, Sasha Levin wrote:
> On 09/06/2012 06:00 PM, Steven Rostedt wrote:
> >> > I think that that code doesn't make sense. The users of hlist_for_each_* aren't
> >> > supposed to be changing the loop cursor.
> > I totally agree. Modifying the 'node' pointer is just asking for issues.
> > Yes that is error prone, but not due to the double loop. It's due to the
> > modifying of the node pointer that is used internally by the loop
> > counter. Don't do that :-)
> 
> While we're on this subject, I haven't actually seen hlist_for_each_entry() code
> that even *touches* 'pos'.
> 
> Will people yell at me loudly if I change the prototype of those macros to be:
> 
> 	hlist_for_each_entry(tpos, head, member)
> 
> (Dropping the 'pos' parameter), and updating anything that calls those macros to
> drop it as well?

If 'pos' is no longer used in the macro, I don't see any reason for
keeping it around.

-- Steve


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