On ARM, xen_init_IRQ (which calls xen_evtchn_fifo_init) is called after all CPUs are online. It would mean that the notifier will never be called.
Therefore, when a secondary CPU will receive an interrupt, Linux will segfault because the event channel structure for this processor is not initialized. This can be fixed by calling the init function on every online cpu when the event channel fifo driver is initialized. Signed-off-by: Julien Grall <julien.gr...@linaro.org> --- drivers/xen/events/events_fifo.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) diff --git a/drivers/xen/events/events_fifo.c b/drivers/xen/events/events_fifo.c index 1de2a19..15498ab 100644 --- a/drivers/xen/events/events_fifo.c +++ b/drivers/xen/events/events_fifo.c @@ -410,12 +410,14 @@ static struct notifier_block evtchn_fifo_cpu_notifier = { int __init xen_evtchn_fifo_init(void) { - int cpu = get_cpu(); + int cpu; int ret; - ret = evtchn_fifo_init_control_block(cpu); - if (ret < 0) - goto out; + for_each_online_cpu(cpu) { + ret = evtchn_fifo_init_control_block(cpu); + if (ret < 0) + goto out; + } pr_info("Using FIFO-based ABI\n"); @@ -423,6 +425,5 @@ int __init xen_evtchn_fifo_init(void) register_cpu_notifier(&evtchn_fifo_cpu_notifier); out: - put_cpu(); return ret; } -- 1.7.10.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/