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Commit 5549c497 authored by Tejun Heo's avatar Tejun Heo
Browse files

cgroup: s/for_each_subsys()/for_each_root_subsys()/ 



for_each_subsys() walks over subsystems attached to a hierarchy and
we're gonna add iterators which walk over all available subsystems.
Rename for_each_subsys() to for_each_root_subsys() so that it's more
appropriately named and for_each_subsys() can be used to iterate all
subsystems.

While at it, remove unnecessary underbar prefix from macro arguments,
put them inside parentheses, and adjust indentation for the two
for_each_*() macros.

This patch is purely cosmetic.

Signed-off-by: default avatarTejun Heo <tj@kernel.org>
Acked-by: default avatarLi Zefan <lizefan@huawei.com>
parent b326f9d0

kernel/cgroup.c

+22 −25
Original line number Diff line number Diff line
@@ -259,16 +259,13 @@ static int notify_on_release(const struct cgroup *cgrp) 
	return test_bit(CGRP_NOTIFY_ON_RELEASE, &cgrp->flags);

}



/*

 * for_each_subsys() allows you to iterate on each subsystem attached to

 * an active hierarchy

 */

#define for_each_subsys(_root, _ss) \

list_for_each_entry(_ss, &_root->subsys_list, sibling)

/* iterate each subsystem attached to a hierarchy */

#define for_each_root_subsys(root, ss)					\

	list_for_each_entry((ss), &(root)->subsys_list, sibling)



/* for_each_active_root() allows you to iterate across the active hierarchies */

#define for_each_active_root(_root) \

list_for_each_entry(_root, &cgroup_roots, root_list)

/* iterate across the active hierarchies */

#define for_each_active_root(root)					\

	list_for_each_entry((root), &cgroup_roots, root_list)



static inline struct cgroup *__d_cgrp(struct dentry *dentry)

{
@@ -828,7 +825,7 @@ static void cgroup_free_fn(struct work_struct *work) 
	/*

	 * Release the subsystem state objects.

	 */

	for_each_subsys(cgrp->root, ss)

	for_each_root_subsys(cgrp->root, ss)

		ss->css_free(cgrp);



	cgrp->root->number_of_cgroups--;
@@ -944,7 +941,7 @@ static void cgroup_clear_directory(struct dentry *dir, bool base_files, 
	struct cgroup *cgrp = __d_cgrp(dir);

	struct cgroup_subsys *ss;



	for_each_subsys(cgrp->root, ss) {

	for_each_root_subsys(cgrp->root, ss) {

		struct cftype_set *set;

		if (!test_bit(ss->subsys_id, &subsys_mask))

			continue;
@@ -1078,7 +1075,7 @@ static int cgroup_show_options(struct seq_file *seq, struct dentry *dentry) 
	struct cgroup_subsys *ss;



	mutex_lock(&cgroup_root_mutex);

	for_each_subsys(root, ss)

	for_each_root_subsys(root, ss)

		seq_printf(seq, ",%s", ss->name);

	if (root->flags & CGRP_ROOT_SANE_BEHAVIOR)

		seq_puts(seq, ",sane_behavior");
@@ -2054,7 +2051,7 @@ static int cgroup_attach_task(struct cgroup *cgrp, struct task_struct *tsk, 
	/*

	 * step 1: check that we can legitimately attach to the cgroup.

	 */

	for_each_subsys(root, ss) {

	for_each_root_subsys(root, ss) {

		if (ss->can_attach) {

			retval = ss->can_attach(cgrp, &tset);

			if (retval) {
@@ -2091,7 +2088,7 @@ static int cgroup_attach_task(struct cgroup *cgrp, struct task_struct *tsk, 
	/*

	 * step 4: do subsystem attach callbacks.

	 */

	for_each_subsys(root, ss) {

	for_each_root_subsys(root, ss) {

		if (ss->attach)

			ss->attach(cgrp, &tset);

	}
@@ -2111,7 +2108,7 @@ out_put_css_set_refs: 
	}

out_cancel_attach:

	if (retval) {

		for_each_subsys(root, ss) {

		for_each_root_subsys(root, ss) {

			if (ss == failed_ss)

				break;

			if (ss->cancel_attach)
@@ -4137,7 +4134,7 @@ static int cgroup_populate_dir(struct cgroup *cgrp, bool base_files, 
	}



	/* process cftsets of each subsystem */

	for_each_subsys(cgrp->root, ss) {

	for_each_root_subsys(cgrp->root, ss) {

		struct cftype_set *set;

		if (!test_bit(ss->subsys_id, &subsys_mask))

			continue;
@@ -4147,7 +4144,7 @@ static int cgroup_populate_dir(struct cgroup *cgrp, bool base_files, 
	}



	/* This cgroup is ready now */

	for_each_subsys(cgrp->root, ss) {

	for_each_root_subsys(cgrp->root, ss) {

		struct cgroup_subsys_state *css = cgrp->subsys[ss->subsys_id];

		/*

		 * Update id->css pointer and make this css visible from
@@ -4294,7 +4291,7 @@ static long cgroup_create(struct cgroup *parent, struct dentry *dentry, 
	if (test_bit(CGRP_CPUSET_CLONE_CHILDREN, &parent->flags))

		set_bit(CGRP_CPUSET_CLONE_CHILDREN, &cgrp->flags);



	for_each_subsys(root, ss) {

	for_each_root_subsys(root, ss) {

		struct cgroup_subsys_state *css;



		css = ss->css_alloc(cgrp);
@@ -4333,14 +4330,14 @@ static long cgroup_create(struct cgroup *parent, struct dentry *dentry, 
	root->number_of_cgroups++;



	/* each css holds a ref to the cgroup's dentry */

	for_each_subsys(root, ss)

	for_each_root_subsys(root, ss)

		dget(dentry);



	/* hold a ref to the parent's dentry */

	dget(parent->dentry);



	/* creation succeeded, notify subsystems */

	for_each_subsys(root, ss) {

	for_each_root_subsys(root, ss) {

		err = online_css(ss, cgrp);

		if (err)

			goto err_destroy;
@@ -4365,7 +4362,7 @@ static long cgroup_create(struct cgroup *parent, struct dentry *dentry, 
	return 0;



err_free_all:

	for_each_subsys(root, ss) {

	for_each_root_subsys(root, ss) {

		struct cgroup_subsys_state *css = cgrp->subsys[ss->subsys_id];



		if (css) {
@@ -4478,7 +4475,7 @@ static int cgroup_destroy_locked(struct cgroup *cgrp) 
	 * be killed.

	 */

	atomic_set(&cgrp->css_kill_cnt, 1);

	for_each_subsys(cgrp->root, ss) {

	for_each_root_subsys(cgrp->root, ss) {

		struct cgroup_subsys_state *css = cgrp->subsys[ss->subsys_id];



		/*
@@ -4552,7 +4549,7 @@ static void cgroup_offline_fn(struct work_struct *work) 
	 * css_tryget() is guaranteed to fail now.  Tell subsystems to

	 * initate destruction.

	 */

	for_each_subsys(cgrp->root, ss)

	for_each_root_subsys(cgrp->root, ss)

		offline_css(ss, cgrp);



	/*
@@ -4562,7 +4559,7 @@ static void cgroup_offline_fn(struct work_struct *work) 
	 * whenever that may be, the extra dentry ref is put so that dentry

	 * destruction happens only after all css's are released.

	 */

	for_each_subsys(cgrp->root, ss)

	for_each_root_subsys(cgrp->root, ss)

		css_put(cgrp->subsys[ss->subsys_id]);



	/* delete this cgroup from parent->children */
@@ -4967,7 +4964,7 @@ int proc_cgroup_show(struct seq_file *m, void *v) 
		int count = 0;



		seq_printf(m, "%d:", root->hierarchy_id);

		for_each_subsys(root, ss)

		for_each_root_subsys(root, ss)

			seq_printf(m, "%s%s", count++ ? "," : "", ss->name);

		if (strlen(root->name))

			seq_printf(m, "%sname=%s", count ? "," : "",