1 files changed, 21 insertions, 0 deletions

diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c
index 72024ea8a3a6..7d80a549cae5 100644
--- a/arch/arm/kernel/smp.c
+++ b/arch/arm/kernel/smp.c
@@ -66,6 +66,7 @@ enum ipi_msg_type {
         IPI_CALL_FUNC,
         IPI_CALL_FUNC_SINGLE,
         IPI_CPU_STOP,
+        IPI_COMPLETION,
 };
 
 static DECLARE_COMPLETION(cpu_running);
@@ -456,6 +457,7 @@ static const char *ipi_types[NR_IPI] = {
         S(IPI_CALL_FUNC, "Function call interrupts"),
         S(IPI_CALL_FUNC_SINGLE, "Single function call interrupts"),
         S(IPI_CPU_STOP, "CPU stop interrupts"),
+        S(IPI_COMPLETION, "completion interrupts"),
 };
 
 void show_ipi_list(struct seq_file *p, int prec)
@@ -515,6 +517,19 @@ static void ipi_cpu_stop(unsigned int cpu)
                 cpu_relax();
 }
 
+static DEFINE_PER_CPU(struct completion *, cpu_completion);
+
+int register_ipi_completion(struct completion *completion, int cpu)
+{
+        per_cpu(cpu_completion, cpu) = completion;
+        return IPI_COMPLETION;
+}
+
+static void ipi_complete(unsigned int cpu)
+{
+        complete(per_cpu(cpu_completion, cpu));
+}
+
 /*
  * Main handler for inter-processor interrupts
  */
@@ -565,6 +580,12 @@ void handle_IPI(int ipinr, struct pt_regs *regs)
                 irq_exit();
                 break;
 
+        case IPI_COMPLETION:
+                irq_enter();
+                ipi_complete(cpu);
+                irq_exit();
+                break;
+
         default:
                 printk(KERN_CRIT "CPU%u: Unknown IPI message 0x%x\n",
                        cpu, ipinr);