On Tue, 2 Jun 2015, Carsten Emde wrote: > When threaded interrupts are configured, they may not be > requested before the khtread daemon is running. The system > crashes at an early boot stage, otherwise: <SNIP> > Add the IRQF_TIMER flag as recommended by Sebastian Siewior > -> http://www.spinics.net/lists/linux-rt-users/msg13171.html This is wrong. The interrupts in question are not timers in the sense of system timers. They are related to the clock subsystem and have a totally different purpose, i.e. they are just there to wake up waiters which wait for the synchronization of a particular clock, pll ... So the proper flag is IRQF_NO_THREAD. And that's not a RT problem, that's a mainline problem as well, if 'threadirqs' is set on the kernel command line. Now even if you add IRQF_NO_THREAD then still the interrupt service routine is not RT compatible: static irqreturn_t clk_main_osc_irq_handler(int irq, void *dev_id) { struct clk_main_osc *osc = dev_id; wake_up(&osc->wait); ^^^ takes sleeping spinlocks Thanks, tglx -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
