[PATCH] kill SET_LINKS/REMOVE_LINKS

Both SET_LINKS() and SET_LINKS/REMOVE_LINKS() have exactly one caller, and
these callers already check thread_group_leader().

This patch kills theese macros, they mix two different things: setting
process's parent and registering it in init_task.tasks list.  Callers are
updated to do these actions by hand.

Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

include/linux/sched.h

@@ -1186,18 +1186,6 @@ extern void wait_task_inactive(task_t * p);
 #define remove_parent(p)	list_del_init(&(p)->sibling)
 #define add_parent(p)		list_add_tail(&(p)->sibling,&(p)->parent->children)
 
-#define REMOVE_LINKS(p) do {					\
-	if (thread_group_leader(p))				\
-		list_del_init(&(p)->tasks);			\
-	remove_parent(p);					\
-	} while (0)
-
-#define SET_LINKS(p) do {					\
-	if (thread_group_leader(p))				\
-		list_add_tail(&(p)->tasks,&init_task.tasks);	\
-	add_parent(p);						\
-	} while (0)
-
 #define next_task(p)	list_entry((p)->tasks.next, struct task_struct, tasks)
 #define prev_task(p)	list_entry((p)->tasks.prev, struct task_struct, tasks)
 

kernel/exit.c

@@ -54,11 +54,13 @@ static void __unhash_process(struct task_struct *p)
 	if (thread_group_leader(p)) {
 		detach_pid(p, PIDTYPE_PGID);
 		detach_pid(p, PIDTYPE_SID);
+
+		list_del_init(&p->tasks);
 		if (p->pid)
 			__get_cpu_var(process_counts)--;
 	}
 
-	REMOVE_LINKS(p);
+	remove_parent(p);
 }
 
 void release_task(struct task_struct * p)

kernel/fork.c

@@ -1181,7 +1181,7 @@ static task_t *copy_process(unsigned long clone_flags,
 	 */
 	p->ioprio = current->ioprio;
 
-	SET_LINKS(p);
+	add_parent(p);
 	if (unlikely(p->ptrace & PT_PTRACED))
 		__ptrace_link(p, current->parent);
 
@@ -1191,6 +1191,8 @@ static task_t *copy_process(unsigned long clone_flags,
 		p->signal->session = current->signal->session;
 		attach_pid(p, PIDTYPE_PGID, process_group(p));
 		attach_pid(p, PIDTYPE_SID, p->signal->session);
+
+		list_add_tail(&p->tasks, &init_task.tasks);
 		if (p->pid)
 			__get_cpu_var(process_counts)++;
 	}