cgroup: remove cgroup_subsys argument from callbacks

The argument is not used at all, and it's not necessary, because
a specific callback handler of course knows which subsys it
belongs to.

Now only ->pupulate() takes this argument, because the handlers of
this callback always call cgroup_add_file()/cgroup_add_files().

So we reduce a few lines of code, though the shrinking of object size
is minimal.

 16 files changed, 113 insertions(+), 162 deletions(-)

   text    data     bss     dec     hex filename
5486240  656987 7039960 13183187         c928d3 vmlinux.o.orig
5486170  656987 7039960 13183117         c9288d vmlinux.o

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

1 files changed, 12 insertions, 17 deletions

diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index 7da3e745b74..501adb1b2f4 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -452,23 +452,18 @@ int cgroup_taskset_size(struct cgroup_taskset *tset);
  */
 
 struct cgroup_subsys {
-	struct cgroup_subsys_state *(*create)(struct cgroup_subsys *ss,
-						  struct cgroup *cgrp);
-	int (*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 *cgrp,
-			  struct cgroup_taskset *tset);
-	void (*cancel_attach)(struct cgroup_subsys *ss, struct cgroup *cgrp,
-			      struct cgroup_taskset *tset);
-	void (*attach)(struct cgroup_subsys *ss, struct cgroup *cgrp,
-		       struct cgroup_taskset *tset);
-	void (*fork)(struct cgroup_subsys *ss, struct task_struct *task);
-	void (*exit)(struct cgroup_subsys *ss, struct cgroup *cgrp,
-			struct cgroup *old_cgrp, struct task_struct *task);
-	int (*populate)(struct cgroup_subsys *ss,
-			struct cgroup *cgrp);
-	void (*post_clone)(struct cgroup_subsys *ss, struct cgroup *cgrp);
-	void (*bind)(struct cgroup_subsys *ss, struct cgroup *root);
+	struct cgroup_subsys_state *(*create)(struct cgroup *cgrp);
+	int (*pre_destroy)(struct cgroup *cgrp);
+	void (*destroy)(struct cgroup *cgrp);
+	int (*can_attach)(struct cgroup *cgrp, struct cgroup_taskset *tset);
+	void (*cancel_attach)(struct cgroup *cgrp, struct cgroup_taskset *tset);
+	void (*attach)(struct cgroup *cgrp, struct cgroup_taskset *tset);
+	void (*fork)(struct task_struct *task);
+	void (*exit)(struct cgroup *cgrp, struct cgroup *old_cgrp,
+		     struct task_struct *task);
+	int (*populate)(struct cgroup_subsys *ss, struct cgroup *cgrp);
+	void (*post_clone)(struct cgroup *cgrp);
+	void (*bind)(struct cgroup *root);
 
 	int subsys_id;
 	int active;