X-Git-Url: http://pilppa.org/gitweb/gitweb.cgi?a=blobdiff_plain;f=kernel%2Fkthread.c;h=ac72eea48339cc672cea19962a95e246f87abb83;hb=95c3889cb88ca4833096553c12cde9e7eb792f4c;hp=dcfe724300eb3cd32c46c2d06de4fc92c7de070b;hpb=8ddf83fed6c283dd941ca76ae715eb268ee8c04e;p=linux-2.6-omap-h63xx.git

diff --git a/kernel/kthread.c b/kernel/kthread.c
index dcfe724300e..ac72eea4833 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -13,7 +13,8 @@
 #include <linux/file.h>
 #include <linux/module.h>
 #include <linux/mutex.h>
-#include <asm/semaphore.h>
+
+#define KTHREAD_NICE_LEVEL (-5)
 
 static DEFINE_SPINLOCK(kthread_create_lock);
 static LIST_HEAD(kthread_create_list);
@@ -94,10 +95,18 @@ static void create_kthread(struct kthread_create_info *create)
 	if (pid < 0) {
 		create->result = ERR_PTR(pid);
 	} else {
+		struct sched_param param = { .sched_priority = 0 };
 		wait_for_completion(&create->started);
 		read_lock(&tasklist_lock);
 		create->result = find_task_by_pid(pid);
 		read_unlock(&tasklist_lock);
+		/*
+		 * root may have changed our (kthreadd's) priority or CPU mask.
+		 * The kernel thread should not inherit these properties.
+		 */
+		sched_setscheduler(create->result, SCHED_NORMAL, &param);
+		set_user_nice(create->result, KTHREAD_NICE_LEVEL);
+		set_cpus_allowed(create->result, CPU_MASK_ALL);
 	}
 	complete(&create->done);
 }
@@ -135,9 +144,9 @@ struct task_struct *kthread_create(int (*threadfn)(void *data),
 
 	spin_lock(&kthread_create_lock);
 	list_add_tail(&create.list, &kthread_create_list);
-	wake_up_process(kthreadd_task);
 	spin_unlock(&kthread_create_lock);
 
+	wake_up_process(kthreadd_task);
 	wait_for_completion(&create.done);
 
 	if (!IS_ERR(create.result)) {
@@ -170,6 +179,7 @@ void kthread_bind(struct task_struct *k, unsigned int cpu)
 	wait_task_inactive(k);
 	set_task_cpu(k, cpu);
 	k->cpus_allowed = cpumask_of_cpu(cpu);
+	k->rt.nr_cpus_allowed = 1;
 }
 EXPORT_SYMBOL(kthread_bind);
 
@@ -221,7 +231,7 @@ int kthreadd(void *unused)
 	/* Setup a clean context for our children to inherit. */
 	set_task_comm(tsk, "kthreadd");
 	ignore_signals(tsk);
-	set_user_nice(tsk, -5);
+	set_user_nice(tsk, KTHREAD_NICE_LEVEL);
 	set_cpus_allowed(tsk, CPU_MASK_ALL);
 
 	current->flags |= PF_NOFREEZE;