diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c index a66c088c851c..0fb025cf4276 100644 --- a/kernel/cgroup/cgroup.c +++ b/kernel/cgroup/cgroup.c @@ -6065,6 +6065,9 @@ int __init cgroup_init_early(void) return 0; } +static u16 cgroup_enable_mask __initdata; +static int __init cgroup_disable(char *str); + /** * cgroup_init - cgroup initialization * @@ -6098,6 +6101,12 @@ int __init cgroup_init(void) cgroup_unlock(); + /* + * Apply an implicit disable, knowing that an explicit enable will + * prevent if from doing anything. + */ + cgroup_disable("memory"); + for_each_subsys(ss, ssid) { if (ss->early_init) { struct cgroup_subsys_state *css = @@ -6740,6 +6749,10 @@ static int __init cgroup_disable(char *str) strcmp(token, ss->legacy_name)) continue; + /* An explicit cgroup_enable overrides a disable */ + if (cgroup_enable_mask & (1 << i)) + continue; + static_branch_disable(cgroup_subsys_enabled_key[i]); pr_info("Disabling %s control group subsystem\n", ss->name); @@ -6758,6 +6771,31 @@ static int __init cgroup_disable(char *str) } __setup("cgroup_disable=", cgroup_disable); +static int __init cgroup_enable(char *str) +{ + struct cgroup_subsys *ss; + char *token; + int i; + + while ((token = strsep(&str, ",")) != NULL) { + if (!*token) + continue; + + for_each_subsys(ss, i) { + if (strcmp(token, ss->name) && + strcmp(token, ss->legacy_name)) + continue; + + cgroup_enable_mask |= 1 << i; + static_branch_enable(cgroup_subsys_enabled_key[i]); + pr_info("Enabling %s control group subsystem\n", + ss->name); + } + } + return 1; +} +__setup("cgroup_enable=", cgroup_enable); + void __init __weak enable_debug_cgroup(void) { } static int __init enable_cgroup_debug(char *str)