thanks Mike for info. I add mips list in CC now. In general, the problem does not look like arch specific. Arch code is calling setup_irq. This code calls generic __setup_irq. And then threads are created by this line in kernel/irq/manage.c: t = kthread_create(irq_thread, new, "irq/%d-%s", irq, new->name); and kthreadd_task is uninitialized till this point. The code looks similar for x86_64 so i am missing something obvious. Nevertheless, I am hoping someone from mips-list can throw some light if this feature works well on mips. Thanks -- Ajay On Thu, Oct 23, 2014 at 11:10 PM, Mike Galbraith <umgwanakikbuti@xxxxxxxxx> wrote: > On Thu, 2014-10-23 at 22:48 +0530, ajay kanala wrote: >> Hi, >> any help? > > You should CC the MIPS folks methinks, works fine in x86_64 at least. > > -Mike > > >