1 files changed, 41 insertions, 4 deletions

diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index ce7799540c91..6fd158b21026 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -140,7 +140,6 @@ static void insert_work(struct cpu_workqueue_struct *cwq,
         wake_up(&cwq->more_work);
 }
 
-/* Preempt must be disabled. */
 static void __queue_work(struct cpu_workqueue_struct *cwq,
                          struct work_struct *work)
 {
@@ -175,6 +174,31 @@ int queue_work(struct workqueue_struct *wq, struct work_struct *work)
 }
 EXPORT_SYMBOL_GPL(queue_work);
 
+/**
+ * queue_work_on - queue work on specific cpu
+ * @cpu: CPU number to execute work on
+ * @wq: workqueue to use
+ * @work: work to queue
+ *
+ * Returns 0 if @work was already on a queue, non-zero otherwise.
+ *
+ * We queue the work to a specific CPU, the caller must ensure it
+ * can't go away.
+ */
+int
+queue_work_on(int cpu, struct workqueue_struct *wq, struct work_struct *work)
+{
+        int ret = 0;
+
+        if (!test_and_set_bit(WORK_STRUCT_PENDING, work_data_bits(work))) {
+                BUG_ON(!list_empty(&work->entry));
+                __queue_work(wq_per_cpu(wq, cpu), work);
+                ret = 1;
+        }
+        return ret;
+}
+EXPORT_SYMBOL_GPL(queue_work_on);
+
 static void delayed_work_timer_fn(unsigned long __data)
 {
         struct delayed_work *dwork = (struct delayed_work *)__data;
@@ -397,7 +421,7 @@ void flush_workqueue(struct workqueue_struct *wq)
         might_sleep();
         lock_acquire(&wq->lockdep_map, 0, 0, 0, 2, _THIS_IP_);
         lock_release(&wq->lockdep_map, 1, _THIS_IP_);
-        for_each_cpu_mask(cpu, *cpu_map)
+        for_each_cpu_mask_nr(cpu, *cpu_map)
                 flush_cpu_workqueue(per_cpu_ptr(wq->cpu_wq, cpu));
 }
 EXPORT_SYMBOL_GPL(flush_workqueue);
@@ -477,7 +501,7 @@ static void wait_on_work(struct work_struct *work)
         wq = cwq->wq;
         cpu_map = wq_cpu_map(wq);
 
-        for_each_cpu_mask(cpu, *cpu_map)
+        for_each_cpu_mask_nr(cpu, *cpu_map)
                 wait_on_cpu_work(per_cpu_ptr(wq->cpu_wq, cpu), work);
 }
 
@@ -553,6 +577,19 @@ int schedule_work(struct work_struct *work)
 }
 EXPORT_SYMBOL(schedule_work);
 
+/*
+ * schedule_work_on - put work task on a specific cpu
+ * @cpu: cpu to put the work task on
+ * @work: job to be done
+ *
+ * This puts a job on a specific cpu
+ */
+int schedule_work_on(int cpu, struct work_struct *work)
+{
+        return queue_work_on(cpu, keventd_wq, work);
+}
+EXPORT_SYMBOL(schedule_work_on);
+
 /**
  * schedule_delayed_work - put work task in global workqueue after delay
  * @dwork: job to be done
@@ -813,7 +850,7 @@ void destroy_workqueue(struct workqueue_struct *wq)
         list_del(&wq->list);
         spin_unlock(&workqueue_lock);
 
-        for_each_cpu_mask(cpu, *cpu_map)
+        for_each_cpu_mask_nr(cpu, *cpu_map)
                 cleanup_workqueue_thread(per_cpu_ptr(wq->cpu_wq, cpu));
         put_online_cpus();