The following commit has been merged into the irq/core branch of tip:

Commit-ID:     a6d8d0d12e1942a9403a0e79c87c161aa801d1a7
Gitweb:        https://git.kernel.org/tip/a6d8d0d12e1942a9403a0e79c87c161aa801d1a7
Author:        Thomas Gleixner <tglx@linutronix.de>
AuthorDate:    Tue, 29 Apr 2025 08:55:04 +02:00
Committer:     Thomas Gleixner <tglx@linutronix.de>
CommitterDate: Wed, 07 May 2025 09:08:12 +02:00

genirq/chip: Prepare for code reduction

The interrupt flow handlers have similar patterns to decide whether to
handle an interrupt or not.

Provide common helper functions to allow removal of duplicated code.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/all/20250429065420.682547546@linutronix.de


---
 kernel/irq/chip.c | 35 +++++++++++++++++++++++++++--------
 1 file changed, 27 insertions(+), 8 deletions(-)

diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index 36cf1b0..4b4ce38 100644
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -499,7 +499,7 @@ static bool irq_check_poll(struct irq_desc *desc)
 	return irq_wait_for_poll(desc);
 }
 
-static bool irq_may_run(struct irq_desc *desc)
+static bool irq_can_handle_pm(struct irq_desc *desc)
 {
 	unsigned int mask = IRQD_IRQ_INPROGRESS | IRQD_WAKEUP_ARMED;
 
@@ -524,6 +524,25 @@ static bool irq_may_run(struct irq_desc *desc)
 	return irq_check_poll(desc);
 }
 
+static inline bool irq_can_handle_actions(struct irq_desc *desc)
+{
+	desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
+
+	if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
+		desc->istate |= IRQS_PENDING;
+		return false;
+	}
+	return true;
+}
+
+static inline bool irq_can_handle(struct irq_desc *desc)
+{
+	if (!irq_can_handle_pm(desc))
+		return false;
+
+	return irq_can_handle_actions(desc);
+}
+
 /**
  *	handle_simple_irq - Simple and software-decoded IRQs.
  *	@desc:	the interrupt description structure for this irq
@@ -539,7 +558,7 @@ void handle_simple_irq(struct irq_desc *desc)
 {
 	raw_spin_lock(&desc->lock);
 
-	if (!irq_may_run(desc))
+	if (!irq_can_handle_pm(desc))
 		goto out_unlock;
 
 	desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
@@ -574,7 +593,7 @@ void handle_untracked_irq(struct irq_desc *desc)
 {
 	raw_spin_lock(&desc->lock);
 
-	if (!irq_may_run(desc))
+	if (!irq_can_handle_pm(desc))
 		goto out_unlock;
 
 	desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
@@ -630,7 +649,7 @@ void handle_level_irq(struct irq_desc *desc)
 	raw_spin_lock(&desc->lock);
 	mask_ack_irq(desc);
 
-	if (!irq_may_run(desc))
+	if (!irq_can_handle_pm(desc))
 		goto out_unlock;
 
 	desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
@@ -695,7 +714,7 @@ void handle_fasteoi_irq(struct irq_desc *desc)
 	 * can arrive on the new CPU before the original CPU has completed
 	 * handling the previous one - it may need to be resent.
 	 */
-	if (!irq_may_run(desc)) {
+	if (!irq_can_handle_pm(desc)) {
 		if (irqd_needs_resend_when_in_progress(&desc->irq_data))
 			desc->istate |= IRQS_PENDING;
 		goto out;
@@ -790,7 +809,7 @@ void handle_edge_irq(struct irq_desc *desc)
 
 	desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
 
-	if (!irq_may_run(desc)) {
+	if (!irq_can_handle_pm(desc)) {
 		desc->istate |= IRQS_PENDING;
 		mask_ack_irq(desc);
 		goto out_unlock;
@@ -1166,7 +1185,7 @@ void handle_fasteoi_ack_irq(struct irq_desc *desc)
 
 	raw_spin_lock(&desc->lock);
 
-	if (!irq_may_run(desc))
+	if (!irq_can_handle_pm(desc))
 		goto out;
 
 	desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
@@ -1218,7 +1237,7 @@ void handle_fasteoi_mask_irq(struct irq_desc *desc)
 	raw_spin_lock(&desc->lock);
 	mask_ack_irq(desc);
 
-	if (!irq_may_run(desc))
+	if (!irq_can_handle_pm(desc))
 		goto out;
 
 	desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);