sched: add init_idle_bootup_task()

add the init_idle_bootup_task() callback to the bootup thread, unused at the moment. (CFS will use it to switch the scheduling class of the boot thread to the idle class) Signed-off-by: Ingo Molnar <[email protected]>
maraz · Jul 9, 2007 · 1df2105 · 1df2105
1 parent 4da1ce6
commit 1df2105
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Showing 3 changed files with 9 additions and 2 deletions.
diff --git a/include/linux/sched.h b/include/linux/sched.h
@@ -195,6 +195,7 @@ struct task_struct;
 extern void sched_init(void);
 extern void sched_init_smp(void);
 extern void init_idle(struct task_struct *idle, int cpu);
+extern void init_idle_bootup_task(struct task_struct *idle);
 
 extern cpumask_t nohz_cpu_mask;
 #if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ)

diff --git a/init/main.c b/init/main.c
@@ -436,15 +436,16 @@ static void noinline __init_refok rest_init(void)
 
 	/*
 	 * The boot idle thread must execute schedule()
-	 * at least one to get things moving:
+	 * at least once to get things moving:
 	 */
+	init_idle_bootup_task(current);
 	preempt_enable_no_resched();
 	schedule();
 	preempt_disable();
 
 	/* Call into cpu_idle with preempt disabled */
 	cpu_idle();
-} 
+}
 
 /* Check for early params. */
 static int __init do_early_param(char *param, char *val)

diff --git a/kernel/sched.c b/kernel/sched.c
@@ -5018,6 +5018,11 @@ void show_state_filter(unsigned long state_filter)
 		debug_show_all_locks();
 }
 
+void __cpuinit init_idle_bootup_task(struct task_struct *idle)
+{
+	/* nothing yet */
+}
+
 /**
  * init_idle - set up an idle thread for a given CPU
  * @idle: task in question