linux-kernel - [tip: irq/core] genirq/manage: Rework prepare_percpu

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Message-ID: <174660884121.406.14369226360250001451.tip-bot2@tip-bot2>
Date: Wed, 07 May 2025 09:07:21 -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/manage: Rework prepare_percpu_nmi()

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

Commit-ID:     65dd1f7ca94fde615684827af285a0475d177b9a
Gitweb:        https://git.kernel.org/tip/65dd1f7ca94fde615684827af285a0475d177b9a
Author:        Thomas Gleixner <tglx@...utronix.de>
AuthorDate:    Tue, 29 Apr 2025 08:55:49 +02:00
Committer:     Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Wed, 07 May 2025 09:08:16 +02:00

genirq/manage: Rework prepare_percpu_nmi()

Use the new guards to get and lock the interrupt descriptor and tidy up the
code.

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/20250429065422.494561120@linutronix.de


---
 kernel/irq/manage.c | 29 ++++++++---------------------
 1 file changed, 8 insertions(+), 21 deletions(-)

diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index a57e952..c6472b1 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -2606,32 +2606,19 @@ err_out:
  */
 int prepare_percpu_nmi(unsigned int irq)
 {
-	unsigned long flags;
-	struct irq_desc *desc;
-	int ret = 0;
+	int ret = -EINVAL;
 
 	WARN_ON(preemptible());
 
-	desc = irq_get_desc_lock(irq, &flags,
-				 IRQ_GET_DESC_CHECK_PERCPU);
-	if (!desc)
-		return -EINVAL;
-
-	if (WARN(!irq_is_nmi(desc),
-		 KERN_ERR "prepare_percpu_nmi called for a non-NMI interrupt: irq %u\n",
-		 irq)) {
-		ret = -EINVAL;
-		goto out;
-	}
+	scoped_irqdesc_get_and_lock(irq, IRQ_GET_DESC_CHECK_PERCPU) {
+		if (WARN(!irq_is_nmi(scoped_irqdesc),
+			 "prepare_percpu_nmi called for a non-NMI interrupt: irq %u\n", irq))
+			return -EINVAL;
 
-	ret = irq_nmi_setup(desc);
-	if (ret) {
-		pr_err("Failed to setup NMI delivery: irq %u\n", irq);
-		goto out;
+		ret = irq_nmi_setup(scoped_irqdesc);
+		if (ret)
+			pr_err("Failed to setup NMI delivery: irq %u\n", irq);
 	}
-
-out:
-	irq_put_desc_unlock(desc, flags);
 	return ret;
 }