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-rw-r--r--arch/x86/kernel/process.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index 4d629c62f4f8..7fc4d5b0a6a0 100644
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -15,6 +15,7 @@ unsigned long idle_nomwait;
EXPORT_SYMBOL(idle_nomwait);
struct kmem_cache *task_xstate_cachep;
+static int force_mwait __cpuinitdata;
int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
{
@@ -199,6 +200,7 @@ static void poll_idle(void)
*
* idle=mwait overrides this decision and forces the usage of mwait.
*/
+static int __cpuinitdata force_mwait;
#define MWAIT_INFO 0x05
#define MWAIT_ECX_EXTENDED_INFO 0x01
@@ -326,6 +328,9 @@ void __cpuinit select_idle_routine(const struct cpuinfo_x86 *c)
static int __init idle_setup(char *str)
{
+ if (!str)
+ return -EINVAL;
+
if (!strcmp(str, "poll")) {
printk("using polling idle threads.\n");
pm_idle = poll_idle;
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