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

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Message-ID: <5048CDA2.10300@gmail.com>
Date:	Thu, 06 Sep 2012 18:21:54 +0200
From:	Sasha Levin <levinsasha928@...il.com>
To:	Steven Rostedt <rostedt@...dmis.org>
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,
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	Trond.Myklebust@...app.com, bfields@...ldses.org,
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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 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?


Thanks,
Sasha
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