cpu_idle_cycle
#define cpu_idle_cycle() (*cpu_idle_cycle_fcn)()
ENTRY(cpu_idle_cycle)
cpu_idle_cycle(void)
ENTRY(cpu_idle_cycle)
#define cpu_idle_cycle() do { /* nothing */ } while (0)
#define cpu_idle_cycle() (*cpu_idle_cycle_func)()
cpu_idle_cycle(void)
cpu_idle_cycle(void)
#define cpu_idle_cycle() __asm volatile("sleep")
cpu_idle_cycle(void)