Re: [PATCH] irqchip: Provide stronger type checking for IRQCHIP_MATCH/IRQCHIP_DECLARE

[Guenter Roeck <linux@roeck-us.net>]

On Thu, Oct 28, 2021 at 07:43:16PM +0100, Marc Zyngier wrote:
> On 2021-10-28 18:28, Guenter Roeck wrote:
> > On Wed, Oct 20, 2021 at 11:45:27AM +0100, Marc Zyngier wrote:
> > > Both IRQCHIP_DECLARE() and IRQCHIP_MATCH() use an underlying
> > > of_device_id()
> > > structure to encode the matching property and the init callback.
> > > However, this callback is stored in as a void * pointer, which
> > > obviously
> > > defeat any attempt at stronger type checking.
> > > 
> > > Work around this by providing a new macro that builds on top of the
> > > __typecheck() primitive, and that can be used to warn when there is
> > > a discrepency between the drivers and core code.
> > > 
> > > Signed-off-by: Marc Zyngier <maz@kernel.org>
> > 
> > This patch results in:
> > 
> > In file included from include/linux/irq.h:589,
> >                  from include/linux/of_irq.h:7,
> >                  from include/linux/irqchip.h:17,
> >                  from arch/h8300/include/asm/irq.h:5,
> >                  from arch/h8300/kernel/traps.c:27:
> > include/linux/irqdesc.h:113:33: error: 'NR_IRQS' undeclared here (not
> > in a function)
> >   113 | extern struct irq_desc irq_desc[NR_IRQS];
> > 
> > and many similar errors when trying to build h8300 images.
> 
> Sigh... Please give this [1] a go.
> 
>         M.
> 
> [1] https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms.git/commit/?h=irq/misc-5.16&id=0646880e517c06f0e0746665ca1e0e6dd36c406e

Yes, that does the trick.

Tested-by: Guenter Roeck <linux@roeck-us.net>

Thanks,
Guenter