cgroup: kill cgrp_ss_priv[CGROUP_CANFORK_COUNT] and friends

Now that nobody use the "priv" arg passed to can_fork/cancel_fork/fork we can
kill CGROUP_CANFORK_COUNT/SUBSYS_TAG/etc and cgrp_ss_priv[] in copy_process().

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

1 files changed, 3 insertions, 4 deletions

diff --git a/kernel/fork.c b/kernel/fork.c
index fce002ee3ddf..ba7d1c037490 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1249,7 +1249,6 @@ static struct task_struct *copy_process(unsigned long clone_flags,
 {
         int retval;
         struct task_struct *p;
-        void *cgrp_ss_priv[CGROUP_CANFORK_COUNT] = {};
 
         if ((clone_flags & (CLONE_NEWNS|CLONE_FS)) == (CLONE_NEWNS|CLONE_FS))
                 return ERR_PTR(-EINVAL);
@@ -1526,7 +1525,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
          * between here and cgroup_post_fork() if an organisation operation is in
          * progress.
          */
-        retval = cgroup_can_fork(p, cgrp_ss_priv);
+        retval = cgroup_can_fork(p);
         if (retval)
                 goto bad_fork_free_pid;
 
@@ -1608,7 +1607,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
         write_unlock_irq(&tasklist_lock);
 
         proc_fork_connector(p);
-        cgroup_post_fork(p, cgrp_ss_priv);
+        cgroup_post_fork(p);
         threadgroup_change_end(current);
         perf_event_fork(p);
 
@@ -1618,7 +1617,7 @@ static struct task_struct *copy_process(unsigned long clone_flags,
         return p;
 
 bad_fork_cancel_cgroup:
-        cgroup_cancel_fork(p, cgrp_ss_priv);
+        cgroup_cancel_fork(p);
 bad_fork_free_pid:
         if (pid != &init_struct_pid)
                 free_pid(pid);