[RESENT PATCH] Don't disable irqs in set_next_event and set_mode callbacks

[Russell King - ARM Linux]

On Fri, Nov 27, 2009 at 09:38:23PM +0100, Uwe Kleine-König wrote:
> OK, so this should make it save for mach-nomadik/timer.c,
> mach-pxa/time.c and mach-sa1100/time.c.
> 
> Only mach-at91/at91rm9200_time.c and mach-at91/at91sam926x_time.c
> request with IRQF_SHARED | IRQF_DISABLED.
> So for there the right solution is to let the local_irq_save in place
> and add a comment that it is needed as the timer irq is shared.
> This hopefully stopps people copying it unnecessarily.

Given that the gentime code spits out warnings if its called with IRQs
enabled, I don't think keeping the local_irq_save() in place is worth
it - especially given Thomas' response.

We've seen such warnings on AT91 (though I don't think we got positively
to the bottom of it with the reporter.)  If you _do_ want to ensure that
AT91 is safe, wrapping the call to dev->event_handler(dev) in the AT91
interrupt handler with a local_irq_save/local_irq_restore would seem
sensible.