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4ab2679351
This patch restricts the allowed cpu mask for rt tasks initially started with a full cpu mask to the little domain. An rt task is specified as real time in __setscheduler() which is finally called for all rt tasks (kernel and user land). In this function we restrict the allowed cpu mask to the little domain. This also prevents that a rt tasks can later be pushed to the big domain because the function find_lowest_rq() will only recognize the allowed cpu mask of a task to find the new cpu the task runs on. Current kludges of the patch: * Since we do not have an API to get the cpu mask of the A7 cluster, hmp_slow_cpu_mask is made global in arm/kernel/topology.c for now. * The watchdog_enable() function calls sched_setscheduler() before kthread_bind() for the cpu specific watchdog kernel threads. The order of these two calls has to be changed to make this patch work. Signed-off-by: Dietmar Eggemann <dietmar.eggemann@arm.com>