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-rw-r--r--kernel/workqueue.c23
1 files changed, 23 insertions, 0 deletions
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index c0168b7da1ea..5bf1be018628 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -4735,6 +4735,29 @@ long work_on_cpu(int cpu, long (*fn)(void *), void *arg)
return wfc.ret;
}
EXPORT_SYMBOL_GPL(work_on_cpu);
+
+/**
+ * work_on_cpu_safe - run a function in thread context on a particular cpu
+ * @cpu: the cpu to run on
+ * @fn: the function to run
+ * @arg: the function argument
+ *
+ * Disables CPU hotplug and calls work_on_cpu(). The caller must not hold
+ * any locks which would prevent @fn from completing.
+ *
+ * Return: The value @fn returns.
+ */
+long work_on_cpu_safe(int cpu, long (*fn)(void *), void *arg)
+{
+ long ret = -ENODEV;
+
+ get_online_cpus();
+ if (cpu_online(cpu))
+ ret = work_on_cpu(cpu, fn, arg);
+ put_online_cpus();
+ return ret;
+}
+EXPORT_SYMBOL_GPL(work_on_cpu_safe);
#endif /* CONFIG_SMP */
#ifdef CONFIG_FREEZER