cgroup: clean up cgroup.h

- replace old name 'cont' with 'cgrp' (Paul Menage did this cleanup for
cgroup.c in commit bd89aabc6761de1c35b154fe6f914a445d301510)
- remove a duplicate declaration of cgroup_path()

Signed-off-by: Li Zefan <[e-mail]>
Acked-by: Paul Menage <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

include/linux/cgroup.h

···
 	char name[MAX_CFTYPE_NAME];
 	int private;
 	int (*open) (struct inode *inode, struct file *file);
-	ssize_t (*read) (struct cgroup *cont, struct cftype *cft,
+	ssize_t (*read) (struct cgroup *cgrp, struct cftype *cft,
 			 struct file *file,
 			 char __user *buf, size_t nbytes, loff_t *ppos);
 	/*
 	 * read_uint() is a shortcut for the common case of returning a
 	 * single integer. Use it in place of read()
 	 */
-	u64 (*read_uint) (struct cgroup *cont, struct cftype *cft);
-	ssize_t (*write) (struct cgroup *cont, struct cftype *cft,
+	u64 (*read_uint) (struct cgroup *cgrp, struct cftype *cft);
+	ssize_t (*write) (struct cgroup *cgrp, struct cftype *cft,
 			  struct file *file,
 			  const char __user *buf, size_t nbytes, loff_t *ppos);
 
···
 	 * a single integer (as parsed by simple_strtoull) from
 	 * userspace. Use in place of write(); return 0 or error.
 	 */
-	int (*write_uint) (struct cgroup *cont, struct cftype *cft, u64 val);
+	int (*write_uint) (struct cgroup *cgrp, struct cftype *cft, u64 val);
 
 	int (*release) (struct inode *inode, struct file *file);
 };
···
 
 /* Add a new file to the given cgroup directory. Should only be
  * called by subsystems from within a populate() method */
-int cgroup_add_file(struct cgroup *cont, struct cgroup_subsys *subsys,
+int cgroup_add_file(struct cgroup *cgrp, struct cgroup_subsys *subsys,
 		       const struct cftype *cft);
 
 /* Add a set of new files to the given cgroup directory. Should
  * only be called by subsystems from within a populate() method */
-int cgroup_add_files(struct cgroup *cont,
+int cgroup_add_files(struct cgroup *cgrp,
 			struct cgroup_subsys *subsys,
 			const struct cftype cft[],
 			int count);
 
-int cgroup_is_removed(const struct cgroup *cont);
+int cgroup_is_removed(const struct cgroup *cgrp);
 
-int cgroup_path(const struct cgroup *cont, char *buf, int buflen);
+int cgroup_path(const struct cgroup *cgrp, char *buf, int buflen);
 
-int cgroup_task_count(const struct cgroup *cont);
+int cgroup_task_count(const struct cgroup *cgrp);
 
 /* Return true if the cgroup is a descendant of the current cgroup */
-int cgroup_is_descendant(const struct cgroup *cont);
+int cgroup_is_descendant(const struct cgroup *cgrp);
 
 /* Control Group subsystem type. See Documentation/cgroups.txt for details */
 
 struct cgroup_subsys {
 	struct cgroup_subsys_state *(*create)(struct cgroup_subsys *ss,
-						  struct cgroup *cont);
-	void (*pre_destroy)(struct cgroup_subsys *ss, struct cgroup *cont);
-	void (*destroy)(struct cgroup_subsys *ss, struct cgroup *cont);
+						  struct cgroup *cgrp);
+	void (*pre_destroy)(struct cgroup_subsys *ss, struct cgroup *cgrp);
+	void (*destroy)(struct cgroup_subsys *ss, struct cgroup *cgrp);
 	int (*can_attach)(struct cgroup_subsys *ss,
-			  struct cgroup *cont, struct task_struct *tsk);
-	void (*attach)(struct cgroup_subsys *ss, struct cgroup *cont,
-			struct cgroup *old_cont, struct task_struct *tsk);
+			  struct cgroup *cgrp, struct task_struct *tsk);
+	void (*attach)(struct cgroup_subsys *ss, struct cgroup *cgrp,
+			struct cgroup *old_cgrp, struct task_struct *tsk);
 	void (*fork)(struct cgroup_subsys *ss, struct task_struct *task);
 	void (*exit)(struct cgroup_subsys *ss, struct task_struct *task);
 	int (*populate)(struct cgroup_subsys *ss,
-			struct cgroup *cont);
-	void (*post_clone)(struct cgroup_subsys *ss, struct cgroup *cont);
+			struct cgroup *cgrp);
+	void (*post_clone)(struct cgroup_subsys *ss, struct cgroup *cgrp);
 	void (*bind)(struct cgroup_subsys *ss, struct cgroup *root);
 	int subsys_id;
 	int active;
···
 #undef SUBSYS
 
 static inline struct cgroup_subsys_state *cgroup_subsys_state(
-	struct cgroup *cont, int subsys_id)
+	struct cgroup *cgrp, int subsys_id)
 {
-	return cont->subsys[subsys_id];
+	return cgrp->subsys[subsys_id];
 }
 
 static inline struct cgroup_subsys_state *task_subsys_state(
···
 {
 	return task_subsys_state(task, subsys_id)->cgroup;
 }
-
-int cgroup_path(const struct cgroup *cont, char *buf, int buflen);
 
 int cgroup_clone(struct task_struct *tsk, struct cgroup_subsys *ss);
 
···
  *    - cgroup_scan_tasks() holds the css_set_lock when calling the test_task()
  *      callback, but not while calling the process_task() callback.
  */
-void cgroup_iter_start(struct cgroup *cont, struct cgroup_iter *it);
-struct task_struct *cgroup_iter_next(struct cgroup *cont,
+void cgroup_iter_start(struct cgroup *cgrp, struct cgroup_iter *it);
+struct task_struct *cgroup_iter_next(struct cgroup *cgrp,
 					struct cgroup_iter *it);
-void cgroup_iter_end(struct cgroup *cont, 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 *, struct task_struct *);