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-rw-r--r--kernel/smp.c19
1 files changed, 19 insertions, 0 deletions
diff --git a/kernel/smp.c b/kernel/smp.c
index 12ed8b013e2d..4ec30e069987 100644
--- a/kernel/smp.c
+++ b/kernel/smp.c
@@ -13,6 +13,7 @@
#include <linux/smp.h>
#include <linux/cpu.h>
+#ifdef CONFIG_USE_GENERIC_SMP_HELPERS
static struct {
struct list_head queue;
raw_spinlock_t lock;
@@ -529,3 +530,21 @@ void ipi_call_unlock_irq(void)
{
raw_spin_unlock_irq(&call_function.lock);
}
+#endif /* USE_GENERIC_SMP_HELPERS */
+
+/*
+ * Call a function on all processors
+ */
+int on_each_cpu(void (*func) (void *info), void *info, int wait)
+{
+ int ret = 0;
+
+ preempt_disable();
+ ret = smp_call_function(func, info, wait);
+ local_irq_disable();
+ func(info);
+ local_irq_enable();
+ preempt_enable();
+ return ret;
+}
+EXPORT_SYMBOL(on_each_cpu);