cgroup: disable controllers at parse time

This patch effectively reverts the commit e8e126a8a071 ("cgroup: fix
too early usage of static_branch_disable()"). The commit 1488e7c8481f
("init: initialize jump labels before command line option parsing") has
moved the jump_label_init() before parse_args() which has made the
commit e8e126a8a071 unnecessary. On the other hand there are
consequences of disabling the controllers later as there are subsystems
doing the controller checks for different decisions. One such incident
is reported [1] regarding the memory controller and its impact on memory
reclaim code.

[1] https://lore.kernel.org/linux-mm/921e53f3-4b13-aab8-4a9e-e83ff15371e4@nec.com

Signed-off-by: Shakeel Butt <shakeelb@google.com>
Reported-by: NOMURA JUNICHI(野村　淳一) <junichi.nomura@nec.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Tested-by: Jun'ichi Nomura <junichi.nomura@nec.com>

diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c
index e049edd66776096a0654c71c7f3c74217a9b3508..e7a9a29982450b4dc8b98819d1b9970c657a6418 100644 (file)
--- a/kernel/cgroup/cgroup.c
+++ b/kernel/cgroup/cgroup.c
@@ -5634,8 +5634,6 @@ int __init cgroup_init_early(void)
        return 0;
 }
 
-static u16 cgroup_disable_mask __initdata;
-
 /**
  * cgroup_init - cgroup initialization
  *
@@ -5694,12 +5692,8 @@ int __init cgroup_init(void)
                 * disabled flag and cftype registration needs kmalloc,
                 * both of which aren't available during early_init.
                 */
-               if (cgroup_disable_mask & (1 << ssid)) {
-                       static_branch_disable(cgroup_subsys_enabled_key[ssid]);
-                       printk(KERN_INFO "Disabling %s control group subsystem\n",
-                              ss->name);
+               if (!cgroup_ssid_enabled(ssid))
                        continue;
-               }
 
                if (cgroup1_ssid_disabled(ssid))
                        printk(KERN_INFO "Disabling %s control group subsystem in v1 mounts\n",
@@ -6214,7 +6208,10 @@ static int __init cgroup_disable(char *str)
                        if (strcmp(token, ss->name) &&
                            strcmp(token, ss->legacy_name))
                                continue;
-                       cgroup_disable_mask |= 1 << i;
+
+                       static_branch_disable(cgroup_subsys_enabled_key[i]);
+                       pr_info("Disabling %s control group subsystem\n",
+                               ss->name);
                }
        }
        return 1;