IRQ_FORCED_THREADING - possible build issue?

[Valdis Kletnieks]

While trying to clean old cruft out of grub.conf, I
chased down a 'threadirqs' parameter.

kernel/irq/manage.c has this in it:

#ifdef CONFIG_IRQ_FORCED_THREADING
__read_mostly bool force_irqthreads;

static int __init setup_forced_irqthreads(char *arg)
{
        force_irqthreads = true;
        return 0;
}
early_param("threadirqs", setup_forced_irqthreads);
#endif

but the references to that variable in irq_thread() and
irq_setup_forced_threading() and elsewhere don't seem to
be similarly guarded.  This can lead to a compile error if
IRQ_FORCED_THREADING isn't in the .config.  Is this actually
being forced on all archs now?  If so, the ifdef/endif is
probably superfluous.  If not, what happens on archs that
don't force it?

(I tried to  build-test it for myself and see, but apparently X86
selects the symbol and I haven't managed to figure out how to
get a compile that doesn't define it. Kbuild kept re-running config
and re-setting it.  'make ARCH=something allnoconfig' for some
value of something that doesn't do it?)

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