Name: Daemonize idle task
Author: Rusty Russell
Status: Tested on 2.5.9

D: This patch allows daemonize() to be called on another process (if
D: not started yet), and calls it on the idle task.

diff -urpN -I \$.*\$ --exclude TAGS -X /home/rusty/devel/kernel/kernel-patches/current-dontdiff --minimal linux-2.5.28.27210/include/linux/sched.h linux-2.5.28.27210.updated/include/linux/sched.h
--- linux-2.5.28.27210/include/linux/sched.h	Thu Jul 25 10:13:18 2002
+++ linux-2.5.28.27210.updated/include/linux/sched.h	Fri Jul 26 17:59:05 2002
@@ -645,7 +645,12 @@ extern void exit_files(struct task_struc
 extern void exit_sighand(struct task_struct *);
 
 extern void reparent_to_init(void);
-extern void daemonize(void);
+extern void __daemonize(struct task_struct *);
+static inline void daemonize(void)
+{
+	__daemonize(current);
+}
+
 extern task_t *child_reaper;
 
 extern int do_execve(char *, char **, char **, struct pt_regs *);
diff -urpN -I \$.*\$ --exclude TAGS -X /home/rusty/devel/kernel/kernel-patches/current-dontdiff --minimal linux-2.5.28.27210/kernel/exit.c linux-2.5.28.27210.updated/kernel/exit.c
--- linux-2.5.28.27210/kernel/exit.c	Thu Jul 25 10:13:18 2002
+++ linux-2.5.28.27210.updated/kernel/exit.c	Fri Jul 26 17:59:05 2002
@@ -200,32 +200,30 @@ void reparent_to_init(void)
  *	Put all the gunge required to become a kernel thread without
  *	attached user resources in one place where it belongs.
  */
-
-void daemonize(void)
+void __daemonize(struct task_struct *tsk)
 {
 	struct fs_struct *fs;
 
-
 	/*
 	 * If we were started as result of loading a module, close all of the
 	 * user space pages.  We don't need them, and if we didn't close them
 	 * they would be locked into memory.
 	 */
-	exit_mm(current);
+	exit_mm(tsk);
 
-	current->session = 1;
-	current->pgrp = 1;
-	current->tty = NULL;
+	tsk->session = 1;
+	tsk->pgrp = 1;
+	tsk->tty = NULL;
 
 	/* Become as one with the init task */
 
-	exit_fs(current);	/* current->fs->count--; */
+	exit_fs(tsk);	/* current->fs->count--; */
 	fs = init_task.fs;
-	current->fs = fs;
+	tsk->fs = fs;
 	atomic_inc(&fs->count);
- 	exit_files(current);
-	current->files = init_task.files;
-	atomic_inc(&current->files->count);
+ 	exit_files(tsk);
+	tsk->files = init_task.files;
+	atomic_inc(&tsk->files->count);
 }
 
 /*
diff -urpN -I \$.*\$ --exclude TAGS -X /home/rusty/devel/kernel/kernel-patches/current-dontdiff --minimal linux-2.5.28.27210/kernel/sched.c linux-2.5.28.27210.updated/kernel/sched.c
--- linux-2.5.28.27210/kernel/sched.c	Thu Jul 25 10:13:18 2002
+++ linux-2.5.28.27210.updated/kernel/sched.c	Fri Jul 26 18:00:13 2002
@@ -1717,6 +1717,9 @@ void __init init_idle(task_t *idle, int 
 	runqueue_t *idle_rq = cpu_rq(cpu), *rq = cpu_rq(task_cpu(idle));
 	unsigned long flags;
 
+	if (idle != &init_task)
+		__daemonize(idle);
+
 	local_irq_save(flags);
 	double_rq_lock(idle_rq, rq);