pid namespaces: rename child_reaper() function

Rename the child_reaper() function to task_child_reaper() to be similar to
other task_* functions and to distinguish the function from 'struct
pid_namspace.child_reaper'.
Signed-off-by: NSukadev Bhattiprolu <sukadev@us.ibm.com>
Cc: Pavel Emelianov <xemul@openvz.org>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: Cedric Le Goater <clg@fr.ibm.com>
Cc: Dave Hansen <haveblue@us.ibm.com>
Cc: Serge Hallyn <serue@us.ibm.com>
Cc: Herbert Poetzel <herbert@13thfloor.at>
Cc: Kirill Korotaev <dev@sw.ru>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

fs/exec.c

@@ -775,7 +775,7 @@ static int de_thread(struct task_struct *tsk)
 	 * Reparenting needs write_lock on tasklist_lock,
 	 * so it is safe to do it under read_lock.
 	 */
-	if (unlikely(tsk->group_leader == child_reaper(tsk)))
+	if (unlikely(tsk->group_leader == task_child_reaper(tsk)))
 		task_active_pid_ns(tsk)->child_reaper = tsk;
 
 	zap_other_threads(tsk);

include/linux/pid_namespace.h

@@ -44,7 +44,7 @@ static inline struct pid_namespace *task_active_pid_ns(struct task_struct *tsk)
 	return tsk->nsproxy->pid_ns;
 }
 
-static inline struct task_struct *child_reaper(struct task_struct *tsk)
+static inline struct task_struct *task_child_reaper(struct task_struct *tsk)
 {
 	return init_pid_ns.child_reaper;
 }

kernel/exit.c

@@ -674,7 +674,7 @@ forget_original_parent(struct task_struct *father, struct list_head *to_release)
 	do {
 		reaper = next_thread(reaper);
 		if (reaper == father) {
-			reaper = child_reaper(father);
+			reaper = task_child_reaper(father);
 			break;
 		}
 	} while (reaper->exit_state);
@@ -874,7 +874,7 @@ static inline void check_stack_usage(void) {}
 
 static inline void exit_child_reaper(struct task_struct *tsk)
 {
-	if (likely(tsk->group_leader != child_reaper(tsk)))
+	if (likely(tsk->group_leader != task_child_reaper(tsk)))
 		return;
 
 	panic("Attempted to kill init!");

kernel/signal.c

@@ -1839,7 +1839,7 @@ int get_signal_to_deliver(siginfo_t *info, struct k_sigaction *return_ka,
 		 * within that pid space. It can of course get signals from
 		 * its parent pid space.
 		 */
-		if (current == child_reaper(current))
+		if (current == task_child_reaper(current))
 			continue;
 
 		if (sig_kernel_stop(signr)) {