On Thu, Jan 30, 2014 at 06:28:52PM +0100, Daniel Lezcano wrote:
Ok, I think the mess is coming from 'default_idle' which does not re-enable the local_irq but used from different places like amd_e400_idle and apm_cpu_idle.
void default_idle(void) { trace_cpu_idle_rcuidle(1, smp_processor_id()); safe_halt(); trace_cpu_idle_rcuidle(PWR_EVENT_EXIT, smp_processor_id()); }
Considering the system configured without cpuidle because this one *always* enable the local irq, we have the different cases:
x86_idle = default_idle(); ==> local_irq_enable is missing
safe_halt() is "sti; hlt" and so very much does the irq_enable.