cgroup freezer: Update stale comments
PATCH 1/1 cgroup freezer: Update stale comments
Update stale comments regarding locking order and add a little more detail so it's easier to follow the locking between the cgroup freezer and the power management freezer code.
Signed-off-by Matt Helsley <matthltc-r/[email protected]>
kernel/cgroup_freezer.c +3 -4
@@ -87,8 +87,8 @@ struct cgroup_subsys freezer_subsys;* ------------------------------ * css_set_lock * cgroup_mutex (AKA cgroup_lock) -* task->alloc_lock (AKA task_lock) * freezer->lock +* task->alloc_lock (AKA task_lock) * task->sighand->siglock * * cgroup code forces css_set_lock to be taken before task->alloc_lock
@@ -103,7 +103,6 @@ struct cgroup_subsys freezer_subsys;* task->alloc_lock (to get task's cgroup) * * freezer_fork() (preserving fork() performance means can't take cgroup_mutex): -* task->alloc_lock (to get task's cgroup) * freezer->lock * sighand->siglock (if the cgroup is freezing) *
@@ -116,13 +115,13 @@ struct cgroup_subsys freezer_subsys;* cgroup_mutex * freezer->lock * read_lock css_set_lock (cgroup iterator start) -* sighand->siglock +* sighand->siglock (fake signal delivery inside freeze_task()) * * freezer_write() (unfreeze): * cgroup_mutex * freezer->lock * read_lock css_set_lock (cgroup iterator start) -* task->alloc_lock (to prevent races with freeze_task()) +* task->alloc_lock (inside thaw_process(), prevents race with refrigerator()) * sighand->siglock */ static struct cgroup_subsys_state *freezer_create(struct cgroup_subsys *ss,