diff options
Diffstat (limited to 'kernel/cgroup.c')
| -rw-r--r-- | kernel/cgroup.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/kernel/cgroup.c b/kernel/cgroup.c index 47851dbc893d..e2e784ad9e0f 100644 --- a/kernel/cgroup.c +++ b/kernel/cgroup.c @@ -2006,7 +2006,7 @@ static struct dentry *cgroup_mount(struct file_system_type *fs_type, { struct super_block *pinned_sb = NULL; struct cgroup_subsys *ss; - struct cgroup_root *root; + struct cgroup_root *root = NULL; struct cgroup_sb_opts opts; struct dentry *dentry; int ret; @@ -5379,6 +5379,12 @@ int __init cgroup_init(void) BUG_ON(cgroup_init_cftypes(NULL, cgroup_dfl_base_files)); BUG_ON(cgroup_init_cftypes(NULL, cgroup_legacy_base_files)); + /* + * The latency of the synchronize_sched() is too high for cgroups, + * avoid it at the cost of forcing all readers into the slow path. + */ + rcu_sync_enter_start(&cgroup_threadgroup_rwsem.rss); + mutex_lock(&cgroup_mutex); /* Add init_css_set to the hash table */ |