(CC irqchip maintainers)
On Thu, Jun 15, 2017 at 03:33:37PM +0300, Yury Norov wrote:
> On Thu, Jun 15, 2017 at 03:08:40PM +0300, Yury Norov wrote:
> > Hi all,
> >
> > Today's linux next falls into panic in init_IRQ():
> > arch/arm64/kernel/irq.c:
> > 53 void __init init_IRQ(void)
> > 54 {
> > 55 irqchip_init();
> > 56 if (!handle_arch_irq)
> > 57 panic("No interrupt controller found.");
> > 58 }
> >
> >
> > Bisecting points to the patch 6fedb069def034 ("of: Provide dummy
> > of_device_compatible_match() for compile-testing"), but reverting it
> > doesn't help. It seems like yesterday's linux-next also hangs. Right
> > now I cannot continue with debugging, but if nothing will get clear,
> > I'll back to it at this evening.
>
> Sorry, forgot to attach the config. This is it. Also, I run arm64 on
> qemu.
The next-20170616 boots well for me. I didn't manage to bisect the
source of problem - it points to different commmits, and reverting
them doesn't help. The source of the problem is that irqchip_init()
doesn't set the handle_arch_irq. It should be done in
of_irq_init() at the line
drivers/of/irq.c:
542 while (!list_empty(&intc_desc_list)) {
...
561 ret = desc->irq_init_cb(desc->dev,
562 desc->interrupt_parent);
...
586 }
On next-20170614 and 15 intc_desc_list is empty at the point. It
should be populated earlier in the loop
510 for_each_matching_node_and_match(np, matches, &match)
But np becomes 0 at the 1st iteration, and so the program doesn't enter the
loop. At the first glance there's no recent changes in related code. Maybe it's dts
issue?..
Yury