diff options
| -rw-r--r-- | kernel/kthread.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/kernel/kthread.c b/kernel/kthread.c index dcfe724300e..0ac887882f9 100644 --- a/kernel/kthread.c +++ b/kernel/kthread.c @@ -15,6 +15,8 @@ #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); struct task_struct *kthreadd_task; @@ -94,10 +96,18 @@ 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, ¶m); + set_user_nice(create->result, KTHREAD_NICE_LEVEL); + set_cpus_allowed(create->result, CPU_MASK_ALL); } complete(&create->done); } @@ -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; |