1 files changed, 15 insertions, 0 deletions

diff --git a/kernel/cpu.c b/kernel/cpu.c
index 8ce10043e4ac..6ba0f1ecb212 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -401,6 +401,7 @@ int disable_nonboot_cpus(void)
                         break;
                 }
         }
+
         if (!error) {
                 BUG_ON(num_online_cpus() > 1);
                 /* Make sure the CPUs won't be enabled by someone else */
@@ -413,6 +414,14 @@ int disable_nonboot_cpus(void)
         return error;
 }
 
+void __weak arch_enable_nonboot_cpus_begin(void)
+{
+}
+
+void __weak arch_enable_nonboot_cpus_end(void)
+{
+}
+
 void __ref enable_nonboot_cpus(void)
 {
         int cpu, error;
@@ -424,6 +433,9 @@ void __ref enable_nonboot_cpus(void)
                 goto out;
 
         printk("Enabling non-boot CPUs ...\n");
+
+        arch_enable_nonboot_cpus_begin();
+
         for_each_cpu(cpu, frozen_cpus) {
                 error = _cpu_up(cpu, 1);
                 if (!error) {
@@ -432,6 +444,9 @@ void __ref enable_nonboot_cpus(void)
                 }
                 printk(KERN_WARNING "Error taking CPU%d up: %d\n", cpu, error);
         }
+
+        arch_enable_nonboot_cpus_end();
+
         cpumask_clear(frozen_cpus);
 out:
         cpu_maps_update_done();