linux-kernel - Re: [PATCH] cgroup: remove duplicate code in allocate_cg

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Message-ID: <6599ad830807300115w5e6a620cw18b63fbcf60fb778@mail.gmail.com>
Date:	Wed, 30 Jul 2008 01:15:03 -0700
From:	"Paul Menage" <menage@...gle.com>
To:	"Li Zefan" <lizf@...fujitsu.com>
Cc:	"Andrew Morton" <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"Linux Containers" <containers@...ts.linux-foundation.org>
Subject: Re: [PATCH] cgroup: remove duplicate code in allocate_cg_link()

On Sun, Jul 27, 2008 at 7:20 PM, Li Zefan <lizf@...fujitsu.com> wrote:
> - just call free_cg_links() in allocate_cg_links()
> - the list will get initialized in allocate_cg_links(), so don't init
>  it twice
>
> Signed-off-by: Li Zefan <lizf@...fujitsu.com>

(Belatedly) Acked-by: Paul Menage <menage@...gle.com>

Thanks, looks like a good cleanup.

> ---
>  kernel/cgroup.c |   30 ++++++++++++------------------
>  1 files changed, 12 insertions(+), 18 deletions(-)
>
> diff --git a/kernel/cgroup.c b/kernel/cgroup.c
> index 28debe4..249a517 100644
> --- a/kernel/cgroup.c
> +++ b/kernel/cgroup.c
> @@ -355,6 +355,17 @@ static struct css_set *find_existing_css_set(
>        return NULL;
>  }
>
> +static void free_cg_links(struct list_head *tmp)
> +{
> +       struct cg_cgroup_link *link;
> +       struct cg_cgroup_link *saved_link;
> +
> +       list_for_each_entry_safe(link, saved_link, tmp, cgrp_link_list) {
> +               list_del(&link->cgrp_link_list);
> +               kfree(link);
> +       }
> +}
> +
>  /*
>  * allocate_cg_links() allocates "count" cg_cgroup_link structures
>  * and chains them on tmp through their cgrp_link_list fields. Returns 0 on
> @@ -363,17 +374,12 @@ static struct css_set *find_existing_css_set(
>  static int allocate_cg_links(int count, struct list_head *tmp)
>  {
>        struct cg_cgroup_link *link;
> -       struct cg_cgroup_link *saved_link;
>        int i;
>        INIT_LIST_HEAD(tmp);
>        for (i = 0; i < count; i++) {
>                link = kmalloc(sizeof(*link), GFP_KERNEL);
>                if (!link) {
> -                       list_for_each_entry_safe(link, saved_link, tmp,
> -                                                cgrp_link_list) {
> -                               list_del(&link->cgrp_link_list);
> -                               kfree(link);
> -                       }
> +                       free_cg_links(tmp);
>                        return -ENOMEM;
>                }
>                list_add(&link->cgrp_link_list, tmp);
> @@ -381,17 +387,6 @@ static int allocate_cg_links(int count, struct list_head *tmp)
>        return 0;
>  }
>
> -static void free_cg_links(struct list_head *tmp)
> -{
> -       struct cg_cgroup_link *link;
> -       struct cg_cgroup_link *saved_link;
> -
> -       list_for_each_entry_safe(link, saved_link, tmp, cgrp_link_list) {
> -               list_del(&link->cgrp_link_list);
> -               kfree(link);
> -       }
> -}
> -
>  /*
>  * find_css_set() takes an existing cgroup group and a
>  * cgroup object, and returns a css_set object that's
> @@ -956,7 +951,6 @@ static int cgroup_get_sb(struct file_system_type *fs_type,
>        struct super_block *sb;
>        struct cgroupfs_root *root;
>        struct list_head tmp_cg_links;
> -       INIT_LIST_HEAD(&tmp_cg_links);
>
>        /* First find the desired set of subsystems */
>        ret = parse_cgroupfs_options(data, &opts);
> --
> 1.5.4.rc3
>
>
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