diff --git a/include/linux/workqueue.h b/include/linux/workqueue.h
index deee212..4618dd6 100644
--- a/include/linux/workqueue.h
+++ b/include/linux/workqueue.h
@@ -424,6 +424,7 @@
 void free_workqueue_attrs(struct workqueue_attrs *attrs);
 int apply_workqueue_attrs(struct workqueue_struct *wq,
 			  const struct workqueue_attrs *attrs);
+int workqueue_set_unbound_cpumask(cpumask_var_t cpumask);
 
 extern bool queue_work_on(int cpu, struct workqueue_struct *wq,
 			struct work_struct *work);
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 9be75e2..a3915ab 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -299,7 +299,7 @@
 static LIST_HEAD(workqueues);		/* PR: list of all workqueues */
 static bool workqueue_freezing;		/* PL: have wqs started freezing? */
 
-static cpumask_var_t wq_unbound_cpumask;
+static cpumask_var_t wq_unbound_cpumask; /* PL: low level cpumask for all unbound wqs */
 
 /* the per-cpu worker pools */
 static DEFINE_PER_CPU_SHARED_ALIGNED(struct worker_pool [NR_STD_WORKER_POOLS],
@@ -3429,7 +3429,7 @@
 
 /**
  * wq_calc_node_mask - calculate a wq_attrs' cpumask for the specified node
- * @attrs: the wq_attrs of interest
+ * @attrs: the wq_attrs of the default pwq of the target workqueue
  * @node: the target NUMA node
  * @cpu_going_down: if >= 0, the CPU to consider as offline
  * @cpumask: outarg, the resulting cpumask
@@ -3493,6 +3493,7 @@
 struct apply_wqattrs_ctx {
 	struct workqueue_struct	*wq;		/* target workqueue */
 	struct workqueue_attrs	*attrs;		/* attrs to apply */
+	struct list_head	list;		/* queued for batching commit */
 	struct pool_workqueue	*dfl_pwq;
 	struct pool_workqueue	*pwq_tbl[];
 };
@@ -3532,9 +3533,15 @@
 	if (!ctx || !new_attrs || !tmp_attrs)
 		goto out_free;
 
-	/* make a copy of @attrs and sanitize it */
+	/*
+	 * Calculate the attrs of the default pwq.
+	 * If the user configured cpumask doesn't overlap with the
+	 * wq_unbound_cpumask, we fallback to the wq_unbound_cpumask.
+	 */
 	copy_workqueue_attrs(new_attrs, attrs);
 	cpumask_and(new_attrs->cpumask, new_attrs->cpumask, wq_unbound_cpumask);
+	if (unlikely(cpumask_empty(new_attrs->cpumask)))
+		cpumask_copy(new_attrs->cpumask, wq_unbound_cpumask);
 
 	/*
 	 * We may create multiple pwqs with differing cpumasks.  Make a
@@ -3553,7 +3560,7 @@
 		goto out_free;
 
 	for_each_node(node) {
-		if (wq_calc_node_cpumask(attrs, node, -1, tmp_attrs->cpumask)) {
+		if (wq_calc_node_cpumask(new_attrs, node, -1, tmp_attrs->cpumask)) {
 			ctx->pwq_tbl[node] = alloc_unbound_pwq(wq, tmp_attrs);
 			if (!ctx->pwq_tbl[node])
 				goto out_free;
@@ -3563,7 +3570,11 @@
 		}
 	}
 
+	/* save the user configured attrs and sanitize it. */
+	copy_workqueue_attrs(new_attrs, attrs);
+	cpumask_and(new_attrs->cpumask, new_attrs->cpumask, cpu_possible_mask);
 	ctx->attrs = new_attrs;
+
 	ctx->wq = wq;
 	free_workqueue_attrs(tmp_attrs);
 	return ctx;
@@ -3704,11 +3715,11 @@
 
 	/*
 	 * Let's determine what needs to be done.  If the target cpumask is
-	 * different from wq's, we need to compare it to @pwq's and create
-	 * a new one if they don't match.  If the target cpumask equals
-	 * wq's, the default pwq should be used.
+	 * different from the default pwq's, we need to compare it to @pwq's
+	 * and create a new one if they don't match.  If the target cpumask
+	 * equals the default pwq's, the default pwq should be used.
 	 */
-	if (wq_calc_node_cpumask(wq->unbound_attrs, node, cpu_off, cpumask)) {
+	if (wq_calc_node_cpumask(wq->dfl_pwq->pool->attrs, node, cpu_off, cpumask)) {
 		if (cpumask_equal(cpumask, pwq->pool->attrs->cpumask))
 			goto out_unlock;
 	} else {
@@ -4731,6 +4742,84 @@
 }
 #endif /* CONFIG_FREEZER */
 
+static int workqueue_apply_unbound_cpumask(void)
+{
+	LIST_HEAD(ctxs);
+	int ret = 0;
+	struct workqueue_struct *wq;
+	struct apply_wqattrs_ctx *ctx, *n;
+
+	lockdep_assert_held(&wq_pool_mutex);
+
+	list_for_each_entry(wq, &workqueues, list) {
+		if (!(wq->flags & WQ_UNBOUND))
+			continue;
+		/* creating multiple pwqs breaks ordering guarantee */
+		if (wq->flags & __WQ_ORDERED)
+			continue;
+
+		ctx = apply_wqattrs_prepare(wq, wq->unbound_attrs);
+		if (!ctx) {
+			ret = -ENOMEM;
+			break;
+		}
+
+		list_add_tail(&ctx->list, &ctxs);
+	}
+
+	list_for_each_entry_safe(ctx, n, &ctxs, list) {
+		if (!ret)
+			apply_wqattrs_commit(ctx);
+		apply_wqattrs_cleanup(ctx);
+	}
+
+	return ret;
+}
+
+/**
+ *  workqueue_set_unbound_cpumask - Set the low-level unbound cpumask
+ *  @cpumask: the cpumask to set
+ *
+ *  The low-level workqueues cpumask is a global cpumask that limits
+ *  the affinity of all unbound workqueues.  This function check the @cpumask
+ *  and apply it to all unbound workqueues and updates all pwqs of them.
+ *
+ *  Retun:	0	- Success
+ *  		-EINVAL	- Invalid @cpumask
+ *  		-ENOMEM	- Failed to allocate memory for attrs or pwqs.
+ */
+int workqueue_set_unbound_cpumask(cpumask_var_t cpumask)
+{
+	int ret = -EINVAL;
+	cpumask_var_t saved_cpumask;
+
+	if (!zalloc_cpumask_var(&saved_cpumask, GFP_KERNEL))
+		return -ENOMEM;
+
+	get_online_cpus();
+	cpumask_and(cpumask, cpumask, cpu_possible_mask);
+	if (!cpumask_empty(cpumask)) {
+		mutex_lock(&wq_pool_mutex);
+
+		/* save the old wq_unbound_cpumask. */
+		cpumask_copy(saved_cpumask, wq_unbound_cpumask);
+
+		/* update wq_unbound_cpumask at first and apply it to wqs. */
+		cpumask_copy(wq_unbound_cpumask, cpumask);
+		ret = workqueue_apply_unbound_cpumask();
+
+		/* restore the wq_unbound_cpumask when failed. */
+		if (ret < 0)
+			cpumask_copy(wq_unbound_cpumask, saved_cpumask);
+
+		mutex_unlock(&wq_pool_mutex);
+	}
+	put_online_cpus();
+
+	free_cpumask_var(saved_cpumask);
+	return ret;
+}
+
 #ifdef CONFIG_SYSFS
 /*
  * Workqueues with WQ_SYSFS flag set is visible to userland via
@@ -4952,14 +5041,34 @@
 {
 	int written;
 
+	mutex_lock(&wq_pool_mutex);
 	written = scnprintf(buf, PAGE_SIZE, "%*pb\n",
 			    cpumask_pr_args(wq_unbound_cpumask));
+	mutex_unlock(&wq_pool_mutex);
 
 	return written;
 }
 
+static ssize_t wq_unbound_cpumask_store(struct device *dev,
+		struct device_attribute *attr, const char *buf, size_t count)
+{
+	cpumask_var_t cpumask;
+	int ret;
+
+	if (!zalloc_cpumask_var(&cpumask, GFP_KERNEL))
+		return -ENOMEM;
+
+	ret = cpumask_parse(buf, cpumask);
+	if (!ret)
+		ret = workqueue_set_unbound_cpumask(cpumask);
+
+	free_cpumask_var(cpumask);
+	return ret ? ret : count;
+}
+
 static struct device_attribute wq_sysfs_cpumask_attr =
-	__ATTR(cpumask, 0444, wq_unbound_cpumask_show, NULL);
+	__ATTR(cpumask, 0644, wq_unbound_cpumask_show,
+	       wq_unbound_cpumask_store);
 
 static int __init wq_sysfs_init(void)
 {