Merge branch 'for-2.6.38' of git://linux-nfs.org/~bfields/linux

[linux.git] / kernel / smp.c

diff --git a/kernel/smp.c b/kernel/smp.c
index 12ed8b013e2d7cd8be438a808f3a6981ab4cd70a..4ec30e0699878d2f536df9ee6ce94d765f046403 100644 (file)
--- 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);