linux-kernel - Re: [PATCH] Block device elevator: use list_for_each_entry() instead of list_for

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Date:	Mon, 28 May 2007 01:12:44 +0800
From:	"rae l" <crquan@...il.com>
To:	"Matthias Kaehlcke" <matthias.kaehlcke@...il.com>, axboe@...nel.dk,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org
Subject: Re: [PATCH] Block device elevator: use list_for_each_entry() instead of list_for_each()

it makes sense to what it does.

On 5/28/07, Matthias Kaehlcke <matthias.kaehlcke@...il.com> wrote:
> Use list_for_each_entry() instead of list_for_each() in the block
> device elevator
>
> Signed-off-by: Matthias Kaehlcke <matthias.kaehlcke@...il.com>
>
> --
>
> diff --git a/block/elevator.c b/block/elevator.c
> index ce866eb..4769a25 100644
> --- a/block/elevator.c
> +++ b/block/elevator.c
> @@ -112,12 +112,8 @@ static inline int elv_try_merge(struct request *__rq, struct bio *bio)
>  static struct elevator_type *elevator_find(const char *name)
>  {
>         struct elevator_type *e;
> -       struct list_head *entry;
> -
> -       list_for_each(entry, &elv_list) {
> -
> -               e = list_entry(entry, struct elevator_type, list);
>
> +       list_for_each_entry(e, &elv_list, list) {
>                 if (!strcmp(e->elevator_name, name))
>                         return e;
>         }
> @@ -1116,14 +1112,11 @@ ssize_t elv_iosched_show(request_queue_t *q, char *name)
>  {
>         elevator_t *e = q->elevator;
>         struct elevator_type *elv = e->elevator_type;
> -       struct list_head *entry;
> +       struct elevator_type *__e;
>         int len = 0;
>
>         spin_lock(&elv_list_lock);
> -       list_for_each(entry, &elv_list) {
> -               struct elevator_type *__e;
> -
> -               __e = list_entry(entry, struct elevator_type, list);
> +       list_for_each_entry(__e, &elv_list, list) {
>                 if (!strcmp(elv->elevator_name, __e->elevator_name))
>                         len += sprintf(name+len, "[%s] ", elv->elevator_name);
>                 else
>
> --
> Matthias Kaehlcke
> Linux Application Developer
> Barcelona
>
>
>    Usually when people are sad, they don't do anything. They just cry over
>      their condition. But when they get angry, they bring about a change
>                               (Malcolm X)
>                                                                  .''`.
>     using free software / Debian GNU/Linux | http://debian.org  : :'  :
>                                                                 `. `'`
> gpg --keyserver pgp.mit.edu --recv-keys 47D8E5D4                  `-
> -
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-- 
Denis Cheng
Linux Application Developer
-
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