1 files changed, 11 insertions, 3 deletions

diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index 6638294cec8d..78533a519d8f 100644
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -479,7 +479,8 @@ static int c1e_detected;
 
 void c1e_remove_cpu(int cpu)
 {
-        cpumask_clear_cpu(cpu, c1e_mask);
+        if (c1e_mask != NULL)
+                cpumask_clear_cpu(cpu, c1e_mask);
 }
 
 /*
@@ -556,13 +557,20 @@ void __cpuinit select_idle_routine(const struct cpuinfo_x86 *c)
                 pm_idle = mwait_idle;
         } else if (check_c1e_idle(c)) {
                 printk(KERN_INFO "using C1E aware idle routine\n");
-                alloc_cpumask_var(&c1e_mask, GFP_KERNEL);
-                cpumask_clear(c1e_mask);
                 pm_idle = c1e_idle;
         } else
                 pm_idle = default_idle;
 }
 
+void __init init_c1e_mask(void)
+{
+        /* If we're using c1e_idle, we need to allocate c1e_mask. */
+        if (pm_idle == c1e_idle) {
+                alloc_cpumask_var(&c1e_mask, GFP_KERNEL);
+                cpumask_clear(c1e_mask);
+        }
+}
+
 static int __init idle_setup(char *str)
 {
         if (!str)