Merge branch 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...

[sfrench/cifs-2.6.git] / kernel / smp.c

diff --git a/kernel/smp.c b/kernel/smp.c
index aff8aa14f54795faa42ae9482da75e3ea9610a82..9e0d0b289118fa3192580b46157e0858bc124fcb 100644 (file)
--- a/kernel/smp.c
+++ b/kernel/smp.c
@@ -13,6 +13,7 @@
 #include <linux/gfp.h>
 #include <linux/smp.h>
 #include <linux/cpu.h>
+#include <linux/sched.h>
 
 #include "smpboot.h"
 
@@ -699,3 +700,24 @@ void kick_all_cpus_sync(void)
        smp_call_function(do_nothing, NULL, 1);
 }
 EXPORT_SYMBOL_GPL(kick_all_cpus_sync);
+
+/**
+ * wake_up_all_idle_cpus - break all cpus out of idle
+ * wake_up_all_idle_cpus try to break all cpus which is in idle state even
+ * including idle polling cpus, for non-idle cpus, we will do nothing
+ * for them.
+ */
+void wake_up_all_idle_cpus(void)
+{
+       int cpu;
+
+       preempt_disable();
+       for_each_online_cpu(cpu) {
+               if (cpu == smp_processor_id())
+                       continue;
+
+               wake_up_if_idle(cpu);
+       }
+       preempt_enable();
+}
+EXPORT_SYMBOL_GPL(wake_up_all_idle_cpus);