Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
---

Index: linux-2.6.git/arch/x86/kernel/process.c
====================================================================
--- linux-2.6.git.orig/arch/x86/kernel/process.c	2008-06-28 21:15:44.000000000 +0400
+++ linux-2.6.git/arch/x86/kernel/process.c	2008-07-05 12:34:02.000000000 +0400
@@ -325,6 +325,9 @@ void __cpuinit select_idle_routine(const
 
 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;

--