Re: [RFC][PATCH] irq: remove IRQF_DISABLED

Benjamin Herrenschmidt
2009-03-06T10:06:35Z

> No, you don't get unlimited IRQ nesting, at least not on sane archs with
> a decent PIC that does things like what I described above :-)

Note that if unlimited nesting is what you are afraid of, you can do
something along the lines of:

- if (!(action->flags & IRQF_DISABLED))
+ if (arch_nest_irq() && !(action->flags & IRQF_DISABLED))
local_irq_enable_in_hardirq();

With arch_nest_irq() then set to always return 0 if you want, or be
smarter and check how much stack space is left, and return 1 only if
above a reasonable threshold.

Cheers,
Ben.