1 files changed, 40 insertions, 10 deletions

diff --git a/kernel/kthread.c b/kernel/kthread.c
index 2dc3786349d1..4ba7cccb4994 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -27,6 +27,7 @@ struct kthread_create_info
         /* Information passed to kthread() from kthreadd. */
         int (*threadfn)(void *data);
         void *data;
+        int node;
 
         /* Result passed back to kthread_create() from kthreadd. */
         struct task_struct *result;
@@ -98,10 +99,23 @@ static int kthread(void *_create)
         do_exit(ret);
 }
 
+/* called from do_fork() to get node information for about to be created task */
+int tsk_fork_get_node(struct task_struct *tsk)
+{
+#ifdef CONFIG_NUMA
+        if (tsk == kthreadd_task)
+                return tsk->pref_node_fork;
+#endif
+        return numa_node_id();
+}
+
 static void create_kthread(struct kthread_create_info *create)
 {
         int pid;
 
+#ifdef CONFIG_NUMA
+        current->pref_node_fork = create->node;
+#endif
         /* We want our own signal handler (we take no signals by default). */
         pid = kernel_thread(kthread, create, CLONE_FS | CLONE_FILES | SIGCHLD);
         if (pid < 0) {
@@ -111,33 +125,38 @@ static void create_kthread(struct kthread_create_info *create)
 }
 
 /**
- * kthread_create - create a kthread.
+ * kthread_create_on_node - create a kthread.
  * @threadfn: the function to run until signal_pending(current).
  * @data: data ptr for @threadfn.
+ * @node: memory node number.
  * @namefmt: printf-style name for the thread.
  *
  * Description: This helper function creates and names a kernel
  * thread.  The thread will be stopped: use wake_up_process() to start
  * it.  See also kthread_run().
  *
+ * If thread is going to be bound on a particular cpu, give its node
+ * in @node, to get NUMA affinity for kthread stack, or else give -1.
  * When woken, the thread will run @threadfn() with @data as its
  * argument. @threadfn() can either call do_exit() directly if it is a
- * standalone thread for which noone will call kthread_stop(), or
+ * standalone thread for which no one will call kthread_stop(), or
  * return when 'kthread_should_stop()' is true (which means
  * kthread_stop() has been called).  The return value should be zero
  * or a negative error number; it will be passed to kthread_stop().
  *
  * Returns a task_struct or ERR_PTR(-ENOMEM).
  */
-struct task_struct *kthread_create(int (*threadfn)(void *data),
-                                   void *data,
-                                   const char namefmt[],
-                                   ...)
+struct task_struct *kthread_create_on_node(int (*threadfn)(void *data),
+                                           void *data,
+                                           int node,
+                                           const char namefmt[],
+                                           ...)
 {
         struct kthread_create_info create;
 
         create.threadfn = threadfn;
         create.data = data;
+        create.node = node;
         init_completion(&create.done);
 
         spin_lock(&kthread_create_lock);
@@ -148,7 +167,7 @@ struct task_struct *kthread_create(int (*threadfn)(void *data),
         wait_for_completion(&create.done);
 
         if (!IS_ERR(create.result)) {
-                struct sched_param param = { .sched_priority = 0 };
+                static const struct sched_param param = { .sched_priority = 0 };
                 va_list args;
 
                 va_start(args, namefmt);
@@ -164,7 +183,7 @@ struct task_struct *kthread_create(int (*threadfn)(void *data),
         }
         return create.result;
 }
-EXPORT_SYMBOL(kthread_create);
+EXPORT_SYMBOL(kthread_create_on_node);
 
 /**
  * kthread_bind - bind a just-created kthread to a cpu.
@@ -183,8 +202,8 @@ void kthread_bind(struct task_struct *p, unsigned int cpu)
                 return;
         }
 
-        p->cpus_allowed = cpumask_of_cpu(cpu);
-        p->rt.nr_cpus_allowed = 1;
+        /* It's safe because the task is inactive. */
+        do_set_cpus_allowed(p, cpumask_of(cpu));
         p->flags |= PF_THREAD_BOUND;
 }
 EXPORT_SYMBOL(kthread_bind);
@@ -265,6 +284,17 @@ int kthreadd(void *unused)
         return 0;
 }
 
+void __init_kthread_worker(struct kthread_worker *worker,
+                                const char *name,
+                                struct lock_class_key *key)
+{
+        spin_lock_init(&worker->lock);
+        lockdep_set_class_and_name(&worker->lock, key, name);
+        INIT_LIST_HEAD(&worker->work_list);
+        worker->task = NULL;
+}
+EXPORT_SYMBOL_GPL(__init_kthread_worker);
+
 /**
  * kthread_worker_fn - kthread function to process kthread_worker
  * @worker_ptr: pointer to initialized kthread_worker