[PATCH] Hotplug CPU prep III: daemonize idle tasks

From: Rusty Russell (rusty@rustcorp.com.au)
Date: Thu May 09 2002 - 03:50:11 EST

This patch introduces __daemonize(task), so idle tasks can be detached
after cloning (required for late creation of idle tasks).

This is independent of the last two patches.

Name: Daemonize idle task
Author: Rusty Russell

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

diff -urN -I \$.*\$ --exclude TAGS -X /home/rusty/devel/kernel/kernel-patches/current-dontdiff --minimal working-2.5.14-dofork+clonepid/include/linux/sched.h tmp/include/linux/sched.h
--- working-2.5.14-dofork+clonepid/include/linux/sched.h Thu May 9 18:25:21 2002
+++ tmp/include/linux/sched.h Thu May 9 18:36:17 2002
@@ -654,7 +654,12 @@
 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 -urN -I \$.*\$ --exclude TAGS -X /home/rusty/devel/kernel/kernel-patches/current-dontdiff --minimal working-2.5.14-dofork+clonepid/kernel/exit.c tmp/kernel/exit.c
--- working-2.5.14-dofork+clonepid/kernel/exit.c Mon Apr 29 16:00:29 2002
+++ tmp/kernel/exit.c Thu May 9 18:36:17 2002
@@ -201,32 +201,30 @@
  * 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 -urN -I \$.*\$ --exclude TAGS -X /home/rusty/devel/kernel/kernel-patches/current-dontdiff --minimal working-2.5.14-dofork+clonepid/kernel/sched.c tmp/kernel/sched.c
--- working-2.5.14-dofork+clonepid/kernel/sched.c Wed May 1 15:09:29 2002
+++ tmp/kernel/sched.c Thu May 9 18:45:17 2002
@@ -1555,6 +1555,8 @@
         runqueue_t *idle_rq = cpu_rq(cpu), *rq = cpu_rq(idle->thread_info->cpu);
         unsigned long flags;
 
+ if (idle != &init_task)
+ __daemonize(idle);
         __save_flags(flags);
         __cli();
         double_rq_lock(idle_rq, rq); 

--
  Anyone who quotes me in their sig is an idiot. -- Rusty Russell.
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