From 455a65260f526cedd4680d4836ebdf2eaf1ab4c6 Mon Sep 17 00:00:00 2001
From: Tobias Schumacher <ts@linux.ibm.com>
Date: Thu, 4 Dec 2025 06:05:01 +0100
Subject: [PATCH] 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 <tglx@linutronix.de>
Reviewed-by: Niklas Schnelle <schnelle@linux.ibm.com>
Reviewed-by: Farhan Ali <alifm@linux.ibm.com>
Signed-off-by: Tobias Schumacher <ts@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
---
 include/linux/irqdesc.h | 6 +++---
 kernel/irq/irqdesc.c    | 6 +++---
 2 files changed, 6 insertions(+), 6 deletions(-)

--- a/include/linux/irqdesc.h
+++ b/include/linux/irqdesc.h
@@ -183,9 +183,9 @@ int generic_handle_irq_safe(unsigned int
  * 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 */
--- a/kernel/irq/irqdesc.c
+++ b/kernel/irq/irqdesc.c
@@ -720,7 +720,7 @@ EXPORT_SYMBOL_GPL(generic_handle_irq_saf
  * 		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));
 }
@@ -738,7 +738,7 @@ EXPORT_SYMBOL_GPL(generic_handle_domain_
  * 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;
@@ -761,7 +761,7 @@ EXPORT_SYMBOL_GPL(generic_handle_domain_
  * 		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));
