cgroup: replace error handling in cgroup_init() with WARN_ON()s

The init sequence shouldn't fail short of bugs and even when it does
it's better to continue with the rest of initialization and we were
silently ignoring /proc/cgroups creation failure.

Drop the explicit error handling and wrap sysfs_create_mount_point(),
register_filesystem() and proc_create() with WARN_ON()s.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizefan@huawei.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 8673843..74daeef 100644 (file)
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -5242,7 +5242,7 @@ int __init cgroup_init(void)
 {
        struct cgroup_subsys *ss;
        unsigned long key;
-       int ssid, err;
+       int ssid;
 
        BUG_ON(percpu_init_rwsem(&cgroup_threadgroup_rwsem));
        BUG_ON(cgroup_init_cftypes(NULL, cgroup_dfl_base_files));
@@ -5304,17 +5304,10 @@ int __init cgroup_init(void)
                        ss->bind(init_css_set.subsys[ssid]);
        }
 
-       err = sysfs_create_mount_point(fs_kobj, "cgroup");
-       if (err)
-               return err;
-
-       err = register_filesystem(&cgroup_fs_type);
-       if (err < 0) {
-               sysfs_remove_mount_point(fs_kobj, "cgroup");
-               return err;
-       }
+       WARN_ON(sysfs_create_mount_point(fs_kobj, "cgroup"));
+       WARN_ON(register_filesystem(&cgroup_fs_type));
+       WARN_ON(!proc_create("cgroups", 0, NULL, &proc_cgroupstats_operations));
 
-       proc_create("cgroups", 0, NULL, &proc_cgroupstats_operations);
        return 0;
 }