Merge tag 'sched_urgent_for_v5.11_rc5' of git://git.kernel.org/pub/scm/linux/kernel...

[sfrench/cifs-2.6.git] / kernel / kthread.c

diff --git a/kernel/kthread.c b/kernel/kthread.c
index fb9c3dcbb68db689b22bfea8679902a6ba2257b9..1578973c57409cceab891f4f36820a2025dc6b1c 100644 (file)
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -493,11 +493,36 @@ struct task_struct *kthread_create_on_cpu(int (*threadfn)(void *data),
                return p;
        kthread_bind(p, cpu);
        /* CPU hotplug need to bind once again when unparking the thread. */
-       set_bit(KTHREAD_IS_PER_CPU, &to_kthread(p)->flags);
        to_kthread(p)->cpu = cpu;
        return p;
 }
 
+void kthread_set_per_cpu(struct task_struct *k, int cpu)
+{
+       struct kthread *kthread = to_kthread(k);
+       if (!kthread)
+               return;
+
+       WARN_ON_ONCE(!(k->flags & PF_NO_SETAFFINITY));
+
+       if (cpu < 0) {
+               clear_bit(KTHREAD_IS_PER_CPU, &kthread->flags);
+               return;
+       }
+
+       kthread->cpu = cpu;
+       set_bit(KTHREAD_IS_PER_CPU, &kthread->flags);
+}
+
+bool kthread_is_per_cpu(struct task_struct *k)
+{
+       struct kthread *kthread = to_kthread(k);
+       if (!kthread)
+               return false;
+
+       return test_bit(KTHREAD_IS_PER_CPU, &kthread->flags);
+}
+
 /**
  * kthread_unpark - unpark a thread created by kthread_create().
  * @k:         thread created by kthread_create().