cgroup: unexport locking interface and cgroup_attach_task()

Now that all external cgroup_lock() users are gone, we can finally unexport the locking interface and prevent future abuse of cgroup_mutex. Make cgroup_[un]lock() and cgroup_lock_live_group() static. Also, cgroup_attach_task() doesn't have any user left and can't be used without locking interface anyway. Make it static too. Signed-off-by: Tejun Heo <[email protected]> Acked-by: Li Zefan <[email protected]>
rtvt123 · Apr 7, 2013 · b9777cf · b9777cf
1 parent 7ae1bad
commit b9777cf
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Showing 2 changed files with 3 additions and 11 deletions.
diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
@@ -30,10 +30,7 @@ struct css_id;
 
 extern int cgroup_init_early(void);
 extern int cgroup_init(void);
-extern void cgroup_lock(void);
 extern int cgroup_lock_is_held(void);
-extern bool cgroup_lock_live_group(struct cgroup *cgrp);
-extern void cgroup_unlock(void);
 extern void cgroup_fork(struct task_struct *p);
 extern void cgroup_post_fork(struct task_struct *p);
 extern void cgroup_exit(struct task_struct *p, int run_callbacks);
@@ -693,8 +690,6 @@ struct task_struct *cgroup_iter_next(struct cgroup *cgrp,
 					struct cgroup_iter *it);
 void cgroup_iter_end(struct cgroup *cgrp, struct cgroup_iter *it);
 int cgroup_scan_tasks(struct cgroup_scanner *scan);
-int cgroup_attach_task(struct cgroup *cgrp, struct task_struct *tsk,
-		       bool threadgroup);
 int cgroup_attach_task_all(struct task_struct *from, struct task_struct *);
 int cgroup_transfer_tasks(struct cgroup *to, struct cgroup *from);
 

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
@@ -336,7 +336,7 @@ static inline struct cftype *__d_cft(struct dentry *dentry)
  * On success, returns true; the lock should be later released with
  * cgroup_unlock(). On failure returns false with no lock held.
  */
-bool cgroup_lock_live_group(struct cgroup *cgrp)
+static bool cgroup_lock_live_group(struct cgroup *cgrp)
 {
 	mutex_lock(&cgroup_mutex);
 	if (cgroup_is_removed(cgrp)) {
@@ -345,7 +345,6 @@ bool cgroup_lock_live_group(struct cgroup *cgrp)
 	}
 	return true;
 }
-EXPORT_SYMBOL_GPL(cgroup_lock_live_group);
 
 /* the list of cgroups eligible for automatic release. Protected by
  * release_list_lock */
@@ -824,22 +823,20 @@ static struct cgroup *task_cgroup_from_root(struct task_struct *task,
  * cgroup_lock - lock out any changes to cgroup structures
  *
  */
-void cgroup_lock(void)
+static void cgroup_lock(void)
 {
 	mutex_lock(&cgroup_mutex);
 }
-EXPORT_SYMBOL_GPL(cgroup_lock);
 
 /**
  * cgroup_unlock - release lock on cgroup changes
  *
  * Undo the lock taken in a previous cgroup_lock() call.
  */
-void cgroup_unlock(void)
+static void cgroup_unlock(void)
 {
 	mutex_unlock(&cgroup_mutex);
 }
-EXPORT_SYMBOL_GPL(cgroup_unlock);
 
 /*
  * A couple of forward declarations required, due to cyclic reference loop: