[RFC, PATCH 3/3] use CLONE_KERNEL_THREAD

[Oleg Nesterov]

For review only.

Add CLONE_KERNEL_THREAD to kthread_create() and change reparent_to_init()
to match CLONE_KERNEL_THREAD.

Signed-off-by: Oleg Nesterov <[EMAIL PROTECTED]>

 kthread.c |    2 +-
 exit.c    |   20 +++++++++-----------
 2 files changed, 10 insertions(+), 12 deletions(-)

--- 2.6.21-rc5-mm4/kernel/kthread.c~3_USE       2007-04-05 12:18:28.000000000 
+0400
+++ 2.6.21-rc5-mm4/kernel/kthread.c     2007-04-08 19:18:59.000000000 +0400
@@ -120,7 +120,7 @@ static void keventd_create_kthread(struc
        int pid;
 
        /* We want our own signal handler (we take no signals by default). */
-       pid = kernel_thread(kthread, create, CLONE_FS | CLONE_FILES | SIGCHLD);
+       pid = kernel_thread(kthread, create, CLONE_FS | CLONE_FILES | 
CLONE_KERNEL_THREAD);
        if (pid < 0) {
                create->result = ERR_PTR(pid);
        } else {
--- 2.6.21-rc5-mm4/kernel/exit.c~3_USE  2007-04-08 19:06:27.000000000 +0400
+++ 2.6.21-rc5-mm4/kernel/exit.c        2007-04-08 19:23:18.000000000 +0400
@@ -279,28 +279,26 @@ static int has_stopped_jobs(struct pid *
 }
 
 /**
- * reparent_to_init - Reparent the calling kernel thread to the init task of 
the pid space that the thread belongs to.
+ * reparent_kthread - Reparent the calling kernel thread to swapper.
  *
  * If a kernel thread is launched as a result of a system call, or if
- * it ever exits, it should generally reparent itself to init so that
- * it is correctly cleaned up on exit.
+ * it ever exits, it should generally reparent itself so that it is
+ * correctly cleaned up on exit.
  *
  * The various task state such as scheduling policy and priority may have
  * been inherited from a user process, so we reset them to sane values here.
  *
- * NOTE that reparent_to_init() gives the caller full capabilities.
+ * NOTE that reparent_kthread() gives the caller full capabilities.
  */
-static void reparent_to_init(void)
+static void reparent_kthread(void)
 {
        write_lock_irq(&tasklist_lock);
 
-       /* Reparent to init */
        remove_parent(current);
-       current->parent = child_reaper(current);
-       add_parent(current);
 
-       /* Set the exit signal to SIGCHLD so we signal init on exit */
-       current->exit_signal = SIGCHLD;
+       current->parent = &init_task;
+       add_parent(current);
+       current->exit_signal = -1;
 
        if (!has_rt_policy(current) && (task_nice(current) < 0))
                set_user_nice(current, 0);
@@ -423,7 +421,7 @@ void daemonize(const char *name, ...)
        current->files = init_task.files;
        atomic_inc(&current->files->count);
 
-       reparent_to_init();
+       reparent_kthread();
 }
 
 EXPORT_SYMBOL(daemonize);

-
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