linux-kernel - Re: [PATCH] drivers/block/ub.c: use list_for_each

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Message-ID: <adasl9dq4zq.fsf@cisco.com>
Date:	Wed, 30 May 2007 16:14:01 -0700
From:	Roland Dreier <rdreier@...co.com>
To:	Pete Zaitcev <zaitcev@...hat.com>
Cc:	"Satyam Sharma" <satyam.sharma@...il.com>,
	"Matthias Kaehlcke" <matthias.kaehlcke@...il.com>, axboe@...nel.dk,
	linux-usb-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org
Subject: Re: [PATCH] drivers/block/ub.c: use list_for_each_entry()

 > The negative is the sheer number of helper functions in list.h. Personally,
 > I find it difficult to retain a working knowledge of them. Iterators are
 > particularly nasty that way. I'm thinking about dropping all of these
 > list_for_each_with_murky_argument_requirements_and_odd_side_effects()
 > and use plain for(;;), as a courtesy to someone who has to read the
 > code years down the road.

I think I disagree with this reasoning.  If I'm reading your code and
I see, say, list_for_each_entry_safe(), I can be pretty confident that
your loop works correctly.  If you write your own for loop, then I
have to check that you actually got the linked list walking right.

 - R.
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