diff options
Diffstat (limited to 'kernel/cgroup/legacy_freezer.c')
| -rw-r--r-- | kernel/cgroup/legacy_freezer.c | 15 |
1 files changed, 11 insertions, 4 deletions
diff --git a/kernel/cgroup/legacy_freezer.c b/kernel/cgroup/legacy_freezer.c index 1b6b21851e9d..122dacb3a443 100644 --- a/kernel/cgroup/legacy_freezer.c +++ b/kernel/cgroup/legacy_freezer.c @@ -22,6 +22,7 @@ #include <linux/freezer.h> #include <linux/seq_file.h> #include <linux/mutex.h> +#include <linux/cpu.h> /* * A cgroup is freezing if any FREEZING flags are set. FREEZING_SELF is @@ -107,16 +108,18 @@ static int freezer_css_online(struct cgroup_subsys_state *css) struct freezer *freezer = css_freezer(css); struct freezer *parent = parent_freezer(freezer); + cpus_read_lock(); mutex_lock(&freezer_mutex); freezer->state |= CGROUP_FREEZER_ONLINE; if (parent && (parent->state & CGROUP_FREEZING)) { freezer->state |= CGROUP_FREEZING_PARENT | CGROUP_FROZEN; - static_branch_inc(&freezer_active); + static_branch_inc_cpuslocked(&freezer_active); } mutex_unlock(&freezer_mutex); + cpus_read_unlock(); return 0; } @@ -131,14 +134,16 @@ static void freezer_css_offline(struct cgroup_subsys_state *css) { struct freezer *freezer = css_freezer(css); + cpus_read_lock(); mutex_lock(&freezer_mutex); if (freezer->state & CGROUP_FREEZING) - static_branch_dec(&freezer_active); + static_branch_dec_cpuslocked(&freezer_active); freezer->state = 0; mutex_unlock(&freezer_mutex); + cpus_read_unlock(); } static void freezer_css_free(struct cgroup_subsys_state *css) @@ -350,7 +355,7 @@ static void freezer_apply_state(struct freezer *freezer, bool freeze, if (freeze) { if (!(freezer->state & CGROUP_FREEZING)) - static_branch_inc(&freezer_active); + static_branch_inc_cpuslocked(&freezer_active); freezer->state |= state; freeze_cgroup(freezer); } else { @@ -361,7 +366,7 @@ static void freezer_apply_state(struct freezer *freezer, bool freeze, if (!(freezer->state & CGROUP_FREEZING)) { freezer->state &= ~CGROUP_FROZEN; if (was_freezing) - static_branch_dec(&freezer_active); + static_branch_dec_cpuslocked(&freezer_active); unfreeze_cgroup(freezer); } } @@ -379,6 +384,7 @@ static void freezer_change_state(struct freezer *freezer, bool freeze) { struct cgroup_subsys_state *pos; + cpus_read_lock(); /* * Update all its descendants in pre-order traversal. Each * descendant will try to inherit its parent's FREEZING state as @@ -407,6 +413,7 @@ static void freezer_change_state(struct freezer *freezer, bool freeze) } rcu_read_unlock(); mutex_unlock(&freezer_mutex); + cpus_read_unlock(); } static ssize_t freezer_write(struct kernfs_open_file *of, |