genirq: Change hwirq parameter to irq_hw_number_t

The irqdomain implementation internally represents hardware IRQs as
irq_hw_number_t, which is defined as unsigned long int. When providing
an irq_hw_number_t to the generic_handle_domain() functions that expect
and unsigned int hwirq, this can lead to a loss of information. Change
the hwirq parameter to irq_hw_number_t to support the full range of
hwirqs.

Reviewed-by: Thomas Gleixner <[e-mail]>
Reviewed-by: Niklas Schnelle <[e-mail]>
Reviewed-by: Farhan Ali <[e-mail]>
Signed-off-by: Tobias Schumacher <[e-mail]>
Signed-off-by: Heiko Carstens <[e-mail]>

include/linux/irqdesc.h

···
  * and handle the result interrupt number. Return -EINVAL if
  * conversion failed.
  */
-int generic_handle_domain_irq(struct irq_domain *domain, unsigned int hwirq);
-int generic_handle_domain_irq_safe(struct irq_domain *domain, unsigned int hwirq);
-int generic_handle_domain_nmi(struct irq_domain *domain, unsigned int hwirq);
+int generic_handle_domain_irq(struct irq_domain *domain, irq_hw_number_t hwirq);
+int generic_handle_domain_irq_safe(struct irq_domain *domain, irq_hw_number_t hwirq);
+int generic_handle_domain_nmi(struct irq_domain *domain, irq_hw_number_t hwirq);
 #endif
 
 /* Test to see if a driver has successfully requested an irq */

kernel/irq/irqdesc.c

···
  * 		This function must be called from an IRQ context with irq regs
  * 		initialized.
  */
-int generic_handle_domain_irq(struct irq_domain *domain, unsigned int hwirq)
+int generic_handle_domain_irq(struct irq_domain *domain, irq_hw_number_t hwirq)
 {
 	return handle_irq_desc(irq_resolve_mapping(domain, hwirq));
 }
···
  * context). If the interrupt is marked as 'enforce IRQ-context only' then
  * the function must be invoked from hard interrupt context.
  */
-int generic_handle_domain_irq_safe(struct irq_domain *domain, unsigned int hwirq)
+int generic_handle_domain_irq_safe(struct irq_domain *domain, irq_hw_number_t hwirq)
 {
 	unsigned long flags;
 	int ret;
···
  * 		This function must be called from an NMI context with irq regs
  * 		initialized.
  **/
-int generic_handle_domain_nmi(struct irq_domain *domain, unsigned int hwirq)
+int generic_handle_domain_nmi(struct irq_domain *domain, irq_hw_number_t hwirq)
 {
 	WARN_ON_ONCE(!in_nmi());
 	return handle_irq_desc(irq_resolve_mapping(domain, hwirq));