linux-kernel - Re: [PATCH 1/2] list: add list_for_each_entry

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Date:	Thu, 6 Jun 2013 22:49:22 +0300
From:	Andy Shevchenko <andy.shevchenko@...il.com>
To:	Jörn Engel <joern@...fs.org>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Chris Mason <chris.mason@...ionio.com>,
	linux-btrfs@...r.kernel.org
Subject: Re: [PATCH 1/2] list: add list_for_each_entry_del

On Thu, Jun 6, 2013 at 9:12 PM, Jörn Engel <joern@...fs.org> wrote:
> On Thu, 6 June 2013 22:32:55 +0300, Andy Shevchenko wrote:
>> On Mon, Jun 3, 2013 at 8:28 PM, Joern Engel <joern@...fs.org> wrote:
>> > I have seen a lot of boilerplate code that either follows the pattern of
>> >         while (!list_empty(head)) {
>> >                 pos = list_entry(head->next, struct foo, list);
>> >                 list_del(pos->list);
>> >                 ...
>> >         }
>> > or some variant thereof.
>>
>> What the problem to use list_for_each_safe()?
>
> The loop may terminate with elements left on the list.  There is more,
> but I would consider this the main problem.

I didn't quite get what you mean.

list_for_each_safe() and list_for_each_entry_safe() traverse across
list. User actually decides when the proper time to remove an element
from the list.

I'm sorry, I didn't see any advantages from list_for_each_del() (or
entry variant).

--
With Best Regards,
Andy Shevchenko
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