linux-kernel - [tip: irq/core] genirq/chip: Rework handle_fasteoi_ack

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Message-ID: <174660885682.406.15109688124642876678.tip-bot2@tip-bot2>
Date: Wed, 07 May 2025 09:07:36 -0000
From: "tip-bot2 for Thomas Gleixner" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Thomas Gleixner <tglx@...utronix.de>,
 "Peter Zijlstra (Intel)" <peterz@...radead.org>, x86@...nel.org,
 linux-kernel@...r.kernel.org, maz@...nel.org
Subject: [tip: irq/core] genirq/chip: Rework handle_fasteoi_ack_irq()

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

Commit-ID:     2beb01cbb75e5849b6ebc15917c7dd3e46264b48
Gitweb:        https://git.kernel.org/tip/2beb01cbb75e5849b6ebc15917c7dd3e46264b48
Author:        Thomas Gleixner <tglx@...utronix.de>
AuthorDate:    Tue, 29 Apr 2025 08:55:14 +02:00
Committer:     Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Wed, 07 May 2025 09:08:13 +02:00

genirq/chip: Rework handle_fasteoi_ack_irq()

Use the new helpers to decide whether the interrupt should be handled and
switch the descriptor locking to guard().

Fixup the kernel doc comment while at it.

No functional change.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Link: https://lore.kernel.org/all/20250429065421.105015800@linutronix.de


---
 kernel/irq/chip.c | 39 +++++++++++++--------------------------
 1 file changed, 13 insertions(+), 26 deletions(-)

diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index 6c33679..2b60542 100644
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -1106,53 +1106,40 @@ void irq_cpu_offline(void)
 
 #ifdef CONFIG_IRQ_FASTEOI_HIERARCHY_HANDLERS
 /**
- *	handle_fasteoi_ack_irq - irq handler for edge hierarchy
- *	stacked on transparent controllers
+ * handle_fasteoi_ack_irq - irq handler for edge hierarchy stacked on
+ *			    transparent controllers
  *
- *	@desc:	the interrupt description structure for this irq
+ * @desc:	the interrupt description structure for this irq
  *
- *	Like handle_fasteoi_irq(), but for use with hierarchy where
- *	the irq_chip also needs to have its ->irq_ack() function
- *	called.
+ * Like handle_fasteoi_irq(), but for use with hierarchy where the irq_chip
+ * also needs to have its ->irq_ack() function called.
  */
 void handle_fasteoi_ack_irq(struct irq_desc *desc)
 {
 	struct irq_chip *chip = desc->irq_data.chip;
 
-	raw_spin_lock(&desc->lock);
-
-	if (!irq_can_handle_pm(desc))
-		goto out;
+	guard(raw_spinlock)(&desc->lock);
 
-	desc->istate &= ~(IRQS_REPLAY | IRQS_WAITING);
+	if (!irq_can_handle_pm(desc)) {
+		cond_eoi_irq(chip, &desc->irq_data);
+		return;
+	}
 
-	/*
-	 * If its disabled or no action available
-	 * then mask it and get out of here:
-	 */
-	if (unlikely(!desc->action || irqd_irq_disabled(&desc->irq_data))) {
-		desc->istate |= IRQS_PENDING;
+	if (unlikely(!irq_can_handle_actions(desc))) {
 		mask_irq(desc);
-		goto out;
+		cond_eoi_irq(chip, &desc->irq_data);
+		return;
 	}
 
 	kstat_incr_irqs_this_cpu(desc);
 	if (desc->istate & IRQS_ONESHOT)
 		mask_irq(desc);
 
-	/* Start handling the irq */
 	desc->irq_data.chip->irq_ack(&desc->irq_data);
 
 	handle_irq_event(desc);
 
 	cond_unmask_eoi_irq(desc, chip);
-
-	raw_spin_unlock(&desc->lock);
-	return;
-out:
-	if (!(chip->flags & IRQCHIP_EOI_IF_HANDLED))
-		chip->irq_eoi(&desc->irq_data);
-	raw_spin_unlock(&desc->lock);
 }
 EXPORT_SYMBOL_GPL(handle_fasteoi_ack_irq);