ns: rename to exit_nsproxy_namespaces()

The current naming is very misleading as this really isn't exiting all
of the task's namespaces. It is only exiting the namespaces that hang of
off nsproxy. Reflect that in the name.

Link: https://patch.msgid.link/[e-mail]
Reviewed-by: Jeff Layton <[e-mail]>
Signed-off-by: Christian Brauner <[e-mail]>

include/linux/nsproxy.h

···
  */
 
 int copy_namespaces(u64 flags, struct task_struct *tsk);
-void exit_task_namespaces(struct task_struct *tsk);
+void exit_nsproxy_namespaces(struct task_struct *tsk);
 void switch_task_namespaces(struct task_struct *tsk, struct nsproxy *new);
 int exec_task_namespaces(void);
 void free_nsproxy(struct nsproxy *ns);

kernel/cgroup/cgroup.c

···
 	} else {
 		/*
 		 * NOTE: This function may be called from bpf_cgroup_from_id()
-		 * on a task which has already passed exit_task_namespaces() and
-		 * nsproxy == NULL. Fall back to cgrp_dfl_root which will make all
-		 * cgroups visible for lookups.
+		 * on a task which has already passed exit_nsproxy_namespaces()
+		 * and nsproxy == NULL. Fall back to cgrp_dfl_root which will
+		 * make all cgroups visible for lookups.
 		 */
 		return &cgrp_dfl_root.cgrp;
 	}

kernel/exit.c

···
 	exit_fs(tsk);
 	if (group_dead)
 		disassociate_ctty(1);
-	exit_task_namespaces(tsk);
+	exit_nsproxy_namespaces(tsk);
 	exit_task_work(tsk);
 	exit_thread(tsk);
 

kernel/fork.c

···
 	if (p->io_context)
 		exit_io_context(p);
 bad_fork_cleanup_namespaces:
-	exit_task_namespaces(p);
+	exit_nsproxy_namespaces(p);
 bad_fork_cleanup_mm:
 	if (p->mm) {
 		mm_clear_owner(p->mm, p);

kernel/nsproxy.c

···
 		put_nsproxy(ns);
 }
 
-void exit_task_namespaces(struct task_struct *p)
+void exit_nsproxy_namespaces(struct task_struct *p)
 {
 	switch_task_namespaces(p, NULL);
 }