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Commit bcd66c89 authored by Tejun Heo's avatar Tejun Heo
Browse files

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: default avatarTejun Heo <tj@kernel.org>
Reviewed-by: default avatarKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Reviewed-by: default avatarMichal Hocko <mhocko@suse.cz>
parent 574bd9f7

kernel/cgroup_freezer.c

+19 −22
Original line number Diff line number Diff line
@@ -31,14 +31,12 @@ enum freezer_state { 
struct freezer {

	struct cgroup_subsys_state	css;

	enum freezer_state		state;

	spinlock_t lock; /* protects _writes_ to 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),

	return container_of(cgroup_subsys_state(cgroup, freezer_subsys_id),

			    struct freezer, css);

}
@@ -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;

}