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cgroup_freezer: trivial cleanups 

* 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@kernel.org>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Reviewed-by: Michal Hocko <mhocko@suse.cz>
This commit is contained in:
Tejun Heo 2012-11-09 09:12:29 -08:00
parent 574bd9f7c7
commit bcd66c894a
1 changed files with 19 additions and 22 deletions
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41
kernel/cgroup_freezer.c
View File

@ -29,17 +29,15 @@ enum freezer_state {
}; };
struct freezer { struct freezer {
struct cgroup_subsys_state css; struct cgroup_subsys_state css;
enum freezer_state state; enum freezer_state state;
spinlock_t lock; /* protects _writes_ to state */ spinlock_t lock;
}; };
static inline struct freezer *cgroup_freezer( static inline struct freezer *cgroup_freezer(struct cgroup *cgroup)
struct cgroup *cgroup)
{ {
return container_of( return container_of(cgroup_subsys_state(cgroup, freezer_subsys_id),
cgroup_subsys_state(cgroup, freezer_subsys_id), struct freezer, css);
struct freezer, css);
} }
static inline struct freezer *task_freezer(struct task_struct *task) 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 * migrated into or out of @cgroup, so we can't verify task states against
* @freezer state here. See freezer_attach() for details. * @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 cgroup_iter it;
struct task_struct *task; struct task_struct *task;
@ -211,12 +210,11 @@ notyet:
static int freezer_read(struct cgroup *cgroup, struct cftype *cft, static int freezer_read(struct cgroup *cgroup, struct cftype *cft,
struct seq_file *m) struct seq_file *m)
{ {
struct freezer *freezer; struct freezer *freezer = cgroup_freezer(cgroup);
enum freezer_state state; enum freezer_state state;
freezer = cgroup_freezer(cgroup);
spin_lock_irq(&freezer->lock); spin_lock_irq(&freezer->lock);
update_if_frozen(cgroup, freezer); update_if_frozen(freezer);
state = freezer->state; state = freezer->state;
spin_unlock_irq(&freezer->lock); spin_unlock_irq(&freezer->lock);
@ -225,8 +223,9 @@ static int freezer_read(struct cgroup *cgroup, struct cftype *cft,
return 0; 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 cgroup_iter it;
struct task_struct *task; struct task_struct *task;
@ -236,8 +235,9 @@ static void freeze_cgroup(struct cgroup *cgroup, struct freezer *freezer)
cgroup_iter_end(cgroup, &it); 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 cgroup_iter it;
struct task_struct *task; struct task_struct *task;
@ -247,11 +247,9 @@ static void unfreeze_cgroup(struct cgroup *cgroup, struct freezer *freezer)
cgroup_iter_end(cgroup, &it); 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) enum freezer_state goal_state)
{ {
struct freezer *freezer = cgroup_freezer(cgroup);
/* also synchronizes against task migration, see freezer_attach() */ /* also synchronizes against task migration, see freezer_attach() */
spin_lock_irq(&freezer->lock); spin_lock_irq(&freezer->lock);
@ -260,13 +258,13 @@ static void freezer_change_state(struct cgroup *cgroup,
if (freezer->state != CGROUP_THAWED) if (freezer->state != CGROUP_THAWED)
atomic_dec(&system_freezing_cnt); atomic_dec(&system_freezing_cnt);
freezer->state = CGROUP_THAWED; freezer->state = CGROUP_THAWED;
unfreeze_cgroup(cgroup, freezer); unfreeze_cgroup(freezer);
break; break;
case CGROUP_FROZEN: case CGROUP_FROZEN:
if (freezer->state == CGROUP_THAWED) if (freezer->state == CGROUP_THAWED)
atomic_inc(&system_freezing_cnt); atomic_inc(&system_freezing_cnt);
freezer->state = CGROUP_FREEZING; freezer->state = CGROUP_FREEZING;
freeze_cgroup(cgroup, freezer); freeze_cgroup(freezer);
break; break;
default: default:
BUG(); BUG();
@ -275,8 +273,7 @@ static void freezer_change_state(struct cgroup *cgroup,
spin_unlock_irq(&freezer->lock); spin_unlock_irq(&freezer->lock);
} }
static int freezer_write(struct cgroup *cgroup, static int freezer_write(struct cgroup *cgroup, struct cftype *cft,
struct cftype *cft,
const char *buffer) const char *buffer)
{ {
enum freezer_state goal_state; enum freezer_state goal_state;
@ -288,7 +285,7 @@ static int freezer_write(struct cgroup *cgroup,
else else
return -EINVAL; return -EINVAL;
freezer_change_state(cgroup, goal_state); freezer_change_state(cgroup_freezer(cgroup), goal_state);
return 0; return 0;
} }