[PATCH] document de_thread() with exit_notify() connection

[Oleg Nesterov]

Add a couple of small comments, it is not easy to see what this code does.

Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx>

--- 25/fs/exec.c~7_DOC_EXIT_EXEC	2008-02-17 23:40:07.000000000 +0300
+++ 25/fs/exec.c	2008-03-03 06:54:31.000000000 +0300
@@ -802,7 +802,7 @@ static int de_thread(struct task_struct 
 	if (!thread_group_leader(tsk)) {
 		leader = tsk->group_leader;
 
-		sig->notify_count = -1;
+		sig->notify_count = -1;	/* for exit_notify() */
 		for (;;) {
 			write_lock_irq(&tasklist_lock);
 			if (likely(leader->exit_state))
--- 25/kernel/exit.c~7_DOC_EXIT_EXEC	2008-03-03 06:46:00.000000000 +0300
+++ 25/kernel/exit.c	2008-03-03 07:07:17.000000000 +0300
@@ -808,6 +808,7 @@ static void exit_notify(struct task_stru
 		state = EXIT_DEAD;
 	tsk->exit_state = state;
 
+	/* mt-exec, de_thread() is waiting for us */
 	if (thread_group_leader(tsk) &&
 	    tsk->signal->notify_count < 0 &&
 	    tsk->signal->group_exit_task)

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