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Message-ID: <20121108095353.GB31821@dhcp22.suse.cz>
Date: Thu, 8 Nov 2012 10:53:53 +0100
From: Michal Hocko <mhocko@...e.cz>
To: Tejun Heo <tj@...nel.org>
Cc: lizefan@...wei.com, rjw@...k.pl,
containers@...ts.linux-foundation.org, cgroups@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
fweisbec@...il.com
Subject: Re: [PATCH 4/9] cgroup_freezer: trivial cleanups
On Sat 03-11-12 01:38:30, Tejun Heo wrote:
> * Clean-up indentation and line-breaks. Drop the invalid comment
> about freezer->lock.
>
> * Make all internal functions take @freezer instead of both @cgroup
> and @freezer.
>
> Signed-off-by: Tejun Heo <tj@...nel.org>
Looks reasonable
Reviewed-by: Michal Hocko <mhocko@...e.cz>
> ---
> kernel/cgroup_freezer.c | 41 +++++++++++++++++++----------------------
> 1 file changed, 19 insertions(+), 22 deletions(-)
>
> diff --git a/kernel/cgroup_freezer.c b/kernel/cgroup_freezer.c
> index bedefd9..975b3d8 100644
> --- a/kernel/cgroup_freezer.c
> +++ b/kernel/cgroup_freezer.c
> @@ -29,17 +29,15 @@ enum freezer_state {
> };
>
> struct freezer {
> - struct cgroup_subsys_state css;
> - enum freezer_state state;
> - spinlock_t lock; /* protects _writes_ to state */
> + struct cgroup_subsys_state css;
> + enum freezer_state state;
> + spinlock_t lock;
> };
>
> -static inline struct freezer *cgroup_freezer(
> - struct cgroup *cgroup)
> +static inline struct freezer *cgroup_freezer(struct cgroup *cgroup)
> {
> - return container_of(
> - cgroup_subsys_state(cgroup, freezer_subsys_id),
> - struct freezer, css);
> + return container_of(cgroup_subsys_state(cgroup, freezer_subsys_id),
> + struct freezer, css);
> }
>
> static inline struct freezer *task_freezer(struct task_struct *task)
> @@ -180,8 +178,9 @@ out:
> * migrated into or out of @cgroup, so we can't verify task states against
> * @freezer state here. See freezer_attach() for details.
> */
> -static void update_if_frozen(struct cgroup *cgroup, struct freezer *freezer)
> +static void update_if_frozen(struct freezer *freezer)
> {
> + struct cgroup *cgroup = freezer->css.cgroup;
> struct cgroup_iter it;
> struct task_struct *task;
>
> @@ -211,12 +210,11 @@ notyet:
> static int freezer_read(struct cgroup *cgroup, struct cftype *cft,
> struct seq_file *m)
> {
> - struct freezer *freezer;
> + struct freezer *freezer = cgroup_freezer(cgroup);
> enum freezer_state state;
>
> - freezer = cgroup_freezer(cgroup);
> spin_lock_irq(&freezer->lock);
> - update_if_frozen(cgroup, freezer);
> + update_if_frozen(freezer);
> state = freezer->state;
> spin_unlock_irq(&freezer->lock);
>
> @@ -225,8 +223,9 @@ static int freezer_read(struct cgroup *cgroup, struct cftype *cft,
> return 0;
> }
>
> -static void freeze_cgroup(struct cgroup *cgroup, struct freezer *freezer)
> +static void freeze_cgroup(struct freezer *freezer)
> {
> + struct cgroup *cgroup = freezer->css.cgroup;
> struct cgroup_iter it;
> struct task_struct *task;
>
> @@ -236,8 +235,9 @@ static void freeze_cgroup(struct cgroup *cgroup, struct freezer *freezer)
> cgroup_iter_end(cgroup, &it);
> }
>
> -static void unfreeze_cgroup(struct cgroup *cgroup, struct freezer *freezer)
> +static void unfreeze_cgroup(struct freezer *freezer)
> {
> + struct cgroup *cgroup = freezer->css.cgroup;
> struct cgroup_iter it;
> struct task_struct *task;
>
> @@ -247,11 +247,9 @@ static void unfreeze_cgroup(struct cgroup *cgroup, struct freezer *freezer)
> cgroup_iter_end(cgroup, &it);
> }
>
> -static void freezer_change_state(struct cgroup *cgroup,
> +static void freezer_change_state(struct freezer *freezer,
> enum freezer_state goal_state)
> {
> - struct freezer *freezer = cgroup_freezer(cgroup);
> -
> /* also synchronizes against task migration, see freezer_attach() */
> spin_lock_irq(&freezer->lock);
>
> @@ -260,13 +258,13 @@ static void freezer_change_state(struct cgroup *cgroup,
> if (freezer->state != CGROUP_THAWED)
> atomic_dec(&system_freezing_cnt);
> freezer->state = CGROUP_THAWED;
> - unfreeze_cgroup(cgroup, freezer);
> + unfreeze_cgroup(freezer);
> break;
> case CGROUP_FROZEN:
> if (freezer->state == CGROUP_THAWED)
> atomic_inc(&system_freezing_cnt);
> freezer->state = CGROUP_FREEZING;
> - freeze_cgroup(cgroup, freezer);
> + freeze_cgroup(freezer);
> break;
> default:
> BUG();
> @@ -275,8 +273,7 @@ static void freezer_change_state(struct cgroup *cgroup,
> spin_unlock_irq(&freezer->lock);
> }
>
> -static int freezer_write(struct cgroup *cgroup,
> - struct cftype *cft,
> +static int freezer_write(struct cgroup *cgroup, struct cftype *cft,
> const char *buffer)
> {
> enum freezer_state goal_state;
> @@ -288,7 +285,7 @@ static int freezer_write(struct cgroup *cgroup,
> else
> return -EINVAL;
>
> - freezer_change_state(cgroup, goal_state);
> + freezer_change_state(cgroup_freezer(cgroup), goal_state);
> return 0;
> }
>
> --
> 1.7.11.7
>
--
Michal Hocko
SUSE Labs
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