x86: idle process - add checking for NULL early param
Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com> Cc: akpm@linux-foundation.org Cc: andi@firstfloor.org Signed-off-by: Ingo Molnar <mingo@elte.hu>
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@ -164,6 +164,9 @@ void __cpuinit select_idle_routine(const struct cpuinfo_x86 *c)
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static int __init idle_setup(char *str)
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{
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if (!str)
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return -EINVAL;
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if (!strcmp(str, "poll")) {
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printk("using polling idle threads.\n");
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pm_idle = poll_idle;
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