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Commit 47cfcd09 authored by Tejun Heo's avatar Tejun Heo
Browse files

cgroup: kill cgroup_[un]lock() 



Now that locking interface is unexported, there's no reason to keep
around these thin wrappers.  Kill them and use mutex operations
directly.

Signed-off-by: default avatarTejun Heo <tj@kernel.org>
Acked-by: default avatarLi Zefan <lizefan@huawei.com>
parent b9777cf8

kernel/cgroup.c

+11 −30
Original line number Diff line number Diff line
@@ -333,8 +333,8 @@ static inline struct cftype *__d_cft(struct dentry *dentry) 
 * cgroup_lock_live_group - take cgroup_mutex and check that cgrp is alive.

 * @cgrp: the cgroup to be checked for liveness

 *

 * On success, returns true; the lock should be later released with

 * cgroup_unlock(). On failure returns false with no lock held.

 * On success, returns true; the mutex should be later unlocked.  On

 * failure returns false with no lock held.

 */

static bool cgroup_lock_live_group(struct cgroup *cgrp)

{
@@ -819,25 +819,6 @@ static struct cgroup *task_cgroup_from_root(struct task_struct *task, 
 * update of a tasks cgroup pointer by cgroup_attach_task()

 */



/**

 * cgroup_lock - lock out any changes to cgroup structures

 *

 */

static void cgroup_lock(void)

{

	mutex_lock(&cgroup_mutex);

}



/**

 * cgroup_unlock - release lock on cgroup changes

 *

 * Undo the lock taken in a previous cgroup_lock() call.

 */

static void cgroup_unlock(void)

{

	mutex_unlock(&cgroup_mutex);

}



/*

 * A couple of forward declarations required, due to cyclic reference loop:

 * cgroup_mkdir -> cgroup_create -> cgroup_populate_dir ->
@@ -1967,7 +1948,7 @@ static void cgroup_task_migrate(struct cgroup *oldcgrp, 
 * Call holding cgroup_mutex and the group_rwsem of the leader. Will take

 * task_lock of @tsk or each thread in the threadgroup individually in turn.

 */

int cgroup_attach_task(struct cgroup *cgrp, struct task_struct *tsk,

static int cgroup_attach_task(struct cgroup *cgrp, struct task_struct *tsk,

			      bool threadgroup)

{

	int retval, i, group_size;
@@ -2191,7 +2172,7 @@ static int attach_task_by_pid(struct cgroup *cgrp, u64 pid, bool threadgroup) 


	put_task_struct(tsk);

out_unlock_cgroup:

	cgroup_unlock();

	mutex_unlock(&cgroup_mutex);

	return ret;

}
@@ -2205,7 +2186,7 @@ int cgroup_attach_task_all(struct task_struct *from, struct task_struct *tsk) 
	struct cgroupfs_root *root;

	int retval = 0;



	cgroup_lock();

	mutex_lock(&cgroup_mutex);

	for_each_active_root(root) {

		struct cgroup *from_cg = task_cgroup_from_root(from, root);
@@ -2213,7 +2194,7 @@ int cgroup_attach_task_all(struct task_struct *from, struct task_struct *tsk) 
		if (retval)

			break;

	}

	cgroup_unlock();

	mutex_unlock(&cgroup_mutex);



	return retval;

}
@@ -2240,7 +2221,7 @@ static int cgroup_release_agent_write(struct cgroup *cgrp, struct cftype *cft, 
	mutex_lock(&cgroup_root_mutex);

	strcpy(cgrp->root->release_agent_path, buffer);

	mutex_unlock(&cgroup_root_mutex);

	cgroup_unlock();

	mutex_unlock(&cgroup_mutex);

	return 0;

}
@@ -2251,7 +2232,7 @@ static int cgroup_release_agent_show(struct cgroup *cgrp, struct cftype *cft, 
		return -ENODEV;

	seq_puts(seq, cgrp->root->release_agent_path);

	seq_putc(seq, '\n');

	cgroup_unlock();

	mutex_unlock(&cgroup_mutex);

	return 0;

}
@@ -3271,9 +3252,9 @@ static void cgroup_transfer_one_task(struct task_struct *task, 
{

	struct cgroup *new_cgroup = scan->data;



	cgroup_lock();

	mutex_lock(&cgroup_mutex);

	cgroup_attach_task(new_cgroup, task, false);

	cgroup_unlock();

	mutex_unlock(&cgroup_mutex);

}



/**