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

[pandora-kernel.git] / kernel / smp.c

diff --git a/kernel/smp.c b/kernel/smp.c
index 75c970c..ed6aacf 100644 (file)
--- a/kernel/smp.c
+++ b/kernel/smp.c
@@ -365,9 +365,10 @@ call:
 EXPORT_SYMBOL_GPL(smp_call_function_any);
 
 /**
- * __smp_call_function_single(): Run a function on another CPU
+ * __smp_call_function_single(): Run a function on a specific CPU
  * @cpu: The CPU to run on.
  * @data: Pre-allocated and setup data structure
+ * @wait: If true, wait until function has completed on specified CPU.
  *
  * Like smp_call_function_single(), but allow caller to pass in a
  * pre-allocated data structure. Useful for embedding @data inside
@@ -376,8 +377,10 @@ EXPORT_SYMBOL_GPL(smp_call_function_any);
 void __smp_call_function_single(int cpu, struct call_single_data *data,
                                int wait)
 {
-       csd_lock(data);
+       unsigned int this_cpu;
+       unsigned long flags;
 
+       this_cpu = get_cpu();
        /*
         * Can deadlock when called with interrupts disabled.
         * We allow cpu's that are not yet online though, as no one else can
@@ -387,7 +390,15 @@ void __smp_call_function_single(int cpu, struct call_single_data *data,
        WARN_ON_ONCE(cpu_online(smp_processor_id()) && wait && irqs_disabled()
                     && !oops_in_progress);
 
-       generic_exec_single(cpu, data, wait);
+       if (cpu == this_cpu) {
+               local_irq_save(flags);
+               data->func(data->info);
+               local_irq_restore(flags);
+       } else {
+               csd_lock(data);
+               generic_exec_single(cpu, data, wait);
+       }
+       put_cpu();
 }
 
 /**