diff options
Diffstat (limited to 'kernel/cgroup.c')
| -rw-r--r-- | kernel/cgroup.c | 43 |
1 files changed, 20 insertions, 23 deletions
diff --git a/kernel/cgroup.c b/kernel/cgroup.c index e66b9ee5ecc1..78017f52c69b 100644 --- a/kernel/cgroup.c +++ b/kernel/cgroup.c @@ -289,8 +289,8 @@ static int notify_on_release(const struct cgroup *cgrp) for ((ssid) = 0; (ssid) < CGROUP_SUBSYS_COUNT && \ (((ss) = cgroup_subsys[ssid]) || true); (ssid)++) -/* iterate across the active hierarchies */ -#define for_each_active_root(root) \ +/* iterate across the hierarchies */ +#define for_each_root(root) \ list_for_each_entry((root), &cgroup_roots, root_list) /** @@ -354,7 +354,6 @@ static struct css_set init_css_set = { .mg_node = LIST_HEAD_INIT(init_css_set.mg_node), }; -static struct cgrp_cset_link init_cgrp_cset_link; static int css_set_count = 1; /* 1 for init_css_set */ /* @@ -693,14 +692,13 @@ static struct cgroupfs_root *cgroup_root_from_kf(struct kernfs_root *kf_root) return top_cgrp->root; } -static int cgroup_init_root_id(struct cgroupfs_root *root, int start, int end) +static int cgroup_init_root_id(struct cgroupfs_root *root) { int id; lockdep_assert_held(&cgroup_mutex); - id = idr_alloc_cyclic(&cgroup_hierarchy_idr, root, start, end, - GFP_KERNEL); + id = idr_alloc_cyclic(&cgroup_hierarchy_idr, root, 0, 0, GFP_KERNEL); if (id < 0) return id; @@ -1405,8 +1403,7 @@ static int cgroup_setup_root(struct cgroupfs_root *root, unsigned long ss_mask) if (ret) goto out; - /* ID 0 is reserved for dummy root, 1 for unified hierarchy */ - ret = cgroup_init_root_id(root, 2, 0); + ret = cgroup_init_root_id(root); if (ret) goto out; @@ -1486,9 +1483,12 @@ retry: goto out_unlock; /* look for a matching existing root */ - for_each_active_root(root) { + for_each_root(root) { bool name_match = false; + if (root == &cgroup_dummy_root) + continue; + /* * If we asked for a name then it must match. Also, if * name matches but sybsys_mask doesn't, we should fail. @@ -2106,9 +2106,12 @@ int cgroup_attach_task_all(struct task_struct *from, struct task_struct *tsk) int retval = 0; mutex_lock(&cgroup_mutex); - for_each_active_root(root) { + for_each_root(root) { struct cgroup *from_cgrp; + if (root == &cgroup_dummy_root) + continue; + down_read(&css_set_rwsem); from_cgrp = task_cgroup_from_root(from, root); up_read(&css_set_rwsem); @@ -4073,26 +4076,17 @@ int __init cgroup_init(void) BUG_ON(cgroup_init_cftypes(NULL, cgroup_base_files)); - /* allocate id for the dummy hierarchy */ + mutex_lock(&cgroup_tree_mutex); mutex_lock(&cgroup_mutex); /* Add init_css_set to the hash table */ key = css_set_hash(init_css_set.subsys); hash_add(css_set_table, &init_css_set.hlist, key); - BUG_ON(cgroup_init_root_id(&cgroup_dummy_root, 0, 1)); - - err = idr_alloc(&cgroup_dummy_root.cgroup_idr, cgroup_dummy_top, - 0, 1, GFP_KERNEL); - BUG_ON(err < 0); - - cgroup_root_count = 1; - init_cgrp_cset_link.cset = &init_css_set; - init_cgrp_cset_link.cgrp = cgroup_dummy_top; - list_add(&init_cgrp_cset_link.cset_link, &cgroup_dummy_top->cset_links); - list_add(&init_cgrp_cset_link.cgrp_link, &init_css_set.cgrp_links); + BUG_ON(cgroup_setup_root(&cgroup_dummy_root, 0)); mutex_unlock(&cgroup_mutex); + mutex_unlock(&cgroup_tree_mutex); for_each_subsys(ss, ssid) { if (!ss->early_init) @@ -4176,11 +4170,14 @@ int proc_cgroup_show(struct seq_file *m, void *v) mutex_lock(&cgroup_mutex); down_read(&css_set_rwsem); - for_each_active_root(root) { + for_each_root(root) { struct cgroup_subsys *ss; struct cgroup *cgrp; int ssid, count = 0; + if (root == &cgroup_dummy_root) + continue; + seq_printf(m, "%d:", root->hierarchy_id); for_each_subsys(ss, ssid) if (root->subsys_mask & (1 << ssid)) |