genirq: Remove __request_percpu_irq() helper

With the IRQ timing stuff being gone, there is no need to specify a flag
when requesting a percpu interrupt. Not only IRQF_TIMER was the only flag
(set of flags actually) allowed, but nobody ever passed it.

Get rid of __request_percpu_irq(), which was only getting 0 as flags, and
promote request_percpu_irq_affinity() as its replacement.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Jinjie Ruan <ruanjinjie@huawei.com>
Link: https://patch.msgid.link/20251210082242.360936-3-maz@kernel.org

Author: Marc Zyngier

include/linux/interrupt.h

@@ -181,9 +181,8 @@ request_any_context_irq(unsigned int irq, irq_handler_t handler,
 			unsigned long flags, const char *name, void *dev_id);
 
 extern int __must_check
-__request_percpu_irq(unsigned int irq, irq_handler_t handler,
-		     unsigned long flags, const char *devname,
-		     const cpumask_t *affinity, void __percpu *percpu_dev_id);
+request_percpu_irq_affinity(unsigned int irq, irq_handler_t handler, const char *devname,
+			    const cpumask_t *affinity, void __percpu *percpu_dev_id);
 
 extern int __must_check
 request_nmi(unsigned int irq, irq_handler_t handler, unsigned long flags,
@@ -193,17 +192,8 @@ static inline int __must_check
 request_percpu_irq(unsigned int irq, irq_handler_t handler,
 		   const char *devname, void __percpu *percpu_dev_id)
 {
-	return __request_percpu_irq(irq, handler, 0,
-				    devname, NULL, percpu_dev_id);
-}
-
-static inline int __must_check
-request_percpu_irq_affinity(unsigned int irq, irq_handler_t handler,
-			    const char *devname, const cpumask_t *affinity,
-			    void __percpu *percpu_dev_id)
-{
-	return __request_percpu_irq(irq, handler, 0,
-				    devname, affinity, percpu_dev_id);
+	return request_percpu_irq_affinity(irq, handler, devname,
+					   NULL, percpu_dev_id);
 }
 
 extern int __must_check

kernel/irq/manage.c

@@ -2510,10 +2510,9 @@ struct irqaction *create_percpu_irqaction(irq_handler_t handler, unsigned long f
 }
 
 /**
- * __request_percpu_irq - allocate a percpu interrupt line
+ * request_percpu_irq_affinity - allocate a percpu interrupt line
  * @irq:	Interrupt line to allocate
  * @handler:	Function to be called when the IRQ occurs.
- * @flags:	Interrupt type flags (IRQF_TIMER only)
  * @devname:	An ascii name for the claiming device
  * @affinity:	A cpumask describing the target CPUs for this interrupt
  * @dev_id:	A percpu cookie passed back to the handler function
@@ -2526,9 +2525,8 @@ struct irqaction *create_percpu_irqaction(irq_handler_t handler, unsigned long f
  * the handler gets called with the interrupted CPU's instance of
  * that variable.
  */
-int __request_percpu_irq(unsigned int irq, irq_handler_t handler,
-			 unsigned long flags, const char *devname,
-			 const cpumask_t *affinity, void __percpu *dev_id)
+int request_percpu_irq_affinity(unsigned int irq, irq_handler_t handler, const char *devname,
+				const cpumask_t *affinity, void __percpu *dev_id)
 {
 	struct irqaction *action;
 	struct irq_desc *desc;
@@ -2542,10 +2540,7 @@ int __request_percpu_irq(unsigned int irq, irq_handler_t handler,
 	    !irq_settings_is_per_cpu_devid(desc))
 		return -EINVAL;
 
-	if (flags && flags != IRQF_TIMER)
-		return -EINVAL;
-
-	action = create_percpu_irqaction(handler, flags, devname, affinity, dev_id);
+	action = create_percpu_irqaction(handler, 0, devname, affinity, dev_id);
 	if (!action)
 		return -ENOMEM;
 
@@ -2564,7 +2559,7 @@ int __request_percpu_irq(unsigned int irq, irq_handler_t handler,
 
 	return retval;
 }
-EXPORT_SYMBOL_GPL(__request_percpu_irq);
+EXPORT_SYMBOL_GPL(request_percpu_irq_affinity);
 
 /**
  * request_percpu_nmi - allocate a percpu interrupt line for NMI delivery