1 files changed, 20 insertions, 0 deletions

diff --git a/kernel/softirq.c b/kernel/softirq.c
index ad3295cdded5..ec8fed42a86f 100644
--- a/kernel/softirq.c
+++ b/kernel/softirq.c
@@ -16,6 +16,7 @@
 #include <linux/cpu.h>
 #include <linux/kthread.h>
 #include <linux/rcupdate.h>
+#include <linux/smp.h>
 
 #include <asm/irq.h>
 /*
@@ -495,3 +496,22 @@ __init int spawn_ksoftirqd(void)
         register_cpu_notifier(&cpu_nfb);
         return 0;
 }
+
+#ifdef CONFIG_SMP
+/*
+ * Call a function on all processors
+ */
+int on_each_cpu(void (*func) (void *info), void *info, int retry, int wait)
+{
+        int ret = 0;
+
+        preempt_disable();
+        ret = smp_call_function(func, info, retry, wait);
+        local_irq_disable();
+        func(info);
+        local_irq_enable();
+        preempt_enable();
+        return ret;
+}
+EXPORT_SYMBOL(on_each_cpu);
+#endif