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authorLi Zefan <lizf@cn.fujitsu.com>2009-01-07 18:07:42 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2009-01-08 08:31:03 -0800
commit33a68ac1c1b695216e873ee12e819adbe73e4d9f (patch)
tree0c58e50e7c528200390f740265f7eb7e7a3a87e6
parente5f6a8609bab0c2d7543ab1505105e011832afd7 (diff)
cgroups: add inactive subsystems to rootnode.subsys_list
Though for an inactive hierarchy, we have subsys->root == &rootnode, but rootnode's subsys_list is always empty. This conflicts with the code in find_css_set(): for (i = 0; i < CGROUP_SUBSYS_COUNT; i++) { ... if (ss->root->subsys_list.next == &ss->sibling) { ... } } if (list_empty(&rootnode.subsys_list)) { ... } The above code assumes rootnode.subsys_list links all inactive hierarchies. Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Cc: Paul Menage <menage@google.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Balbir Singh <balbir@in.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--kernel/cgroup.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index fd572d05769..abf7248f501 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -712,7 +712,7 @@ static int rebind_subsystems(struct cgroupfs_root *root,
BUG_ON(dummytop->subsys[i]->cgroup != dummytop);
cgrp->subsys[i] = dummytop->subsys[i];
cgrp->subsys[i]->cgroup = cgrp;
- list_add(&ss->sibling, &root->subsys_list);
+ list_move(&ss->sibling, &root->subsys_list);
ss->root = root;
if (ss->bind)
ss->bind(ss, cgrp);
@@ -726,7 +726,7 @@ static int rebind_subsystems(struct cgroupfs_root *root,
dummytop->subsys[i]->cgroup = dummytop;
cgrp->subsys[i] = NULL;
subsys[i]->root = &rootnode;
- list_del(&ss->sibling);
+ list_move(&ss->sibling, &rootnode.subsys_list);
} else if (bit & final_bits) {
/* Subsystem state should already exist */
BUG_ON(!cgrp->subsys[i]);
@@ -2521,6 +2521,7 @@ static void __init cgroup_init_subsys(struct cgroup_subsys *ss)
printk(KERN_INFO "Initializing cgroup subsys %s\n", ss->name);
/* Create the top cgroup state for this subsystem */
+ list_add(&ss->sibling, &rootnode.subsys_list);
ss->root = &rootnode;
css = ss->create(ss, dummytop);
/* We don't handle early failures gracefully */