Re: Get rid of IRQF_DISABLED - (was [PATCH] genirq: warn aboutIRQF_SHARED|IRQF_DISABLED)

[Alan Cox]

On Mon, 30 Nov 2009 15:01:00 +0000
Russell King - ARM Linux <linux@xxxxxxxxxxxxxxxx> wrote:

> On Mon, Nov 30, 2009 at 02:47:02PM +0000, Alan Cox wrote:
> > SHARED|DISABLED ought to WARN_ON() and if that doesn't motivate people
> > then return -EINVAL.
> 
> That is an impossibility.  There is hardware out there (AT91) where
> the timer interrupt is shared with other peripherals, and you end
> up with a mixture of irqs-disabled and irqs-enabled handlers sharing
> the same interrupt.

Well that will encourage people to fix it.

> My point is that if we outlaw irqs-disabled shared interrupts, it puts
> Atmel AT91 support into immediate difficulties.

If a driver disables the timer irq across a tick aren't you already in
trouble ?

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